Pi Sigma Elite System

Transcription

Research
HARDWARE REFERENCE
Hardware Reference
Research
Part Number: 29M-071443-6E
November 2008
Pi and the Pi logo are trademarks of Pi Group Limited
© Pi Research Limited 2001 to 2007, 2008
Pi Sigma Elite System Hardware Reference 1
Disclaimer
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for any errors contained herein or for incidental or consequential damages in connection
with the furnishing, performance or use of the software, associated hardware, or this written
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make changes in the content hereof without obligation to notify any person of such revision
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and includes a declaration of the warranty and limitation of liability which apply to
all Pi Research Limited products and services.
Health and Safety information
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is required to classify any hazardous materials in the products it supplies and to provide
relevant safety information to users.
Any hazardous materials in Pi products are clearly marked with appropriate symbols.
Product Safety Data Sheets relating to these materials are available on request.
2
Pi Sigma Elite System Hardware Reference
Specifications........................................................................ 11
Pi Sigma Elite MCU specifications................................................. 11
Part numbers.................................................................................. 12
Installation notes
Introduction............................................................................. 7
Pi Sigma Elite Junior option.............................................................. 7
Pi Sigma Elite System specification................................................. 8
Pi Sigma Elite Junior System specification....................................... 9
Typical System............................................................................... 10
The MCU
Contents
Installation information......................................................... 30
General points on fitting looms....................................................... 30
General points on fitting the MCU.................................................. 32
Installing the MCU.......................................................................... 33
MCU Dimensions............................................................................ 35
The SCU3
Connecting the MCU............................................................. 21
MCU power requirements............................................................... 21
Star points...................................................................................... 22
Connecting systems....................................................................... 23
Connecting the MCU to a vehicle battery....................................... 24
Fitting a backup battery.................................................................. 26
ECU systems.................................................................................. 27
Index
General connector information............................................. 15
Deutsch Autosport connectors....................................................... 15
Deutsch Autosport part numbering................................................. 17
Deutsch Autosport Micro Lite HE connectors................................. 19
Deutsch Autosport Micro Lite HE part numbering.......................... 20
System expansion
Installation notes
The MCU
MCU internal analog debug channels................................... 39
MCU internal analog debug channels............................................ 39
MCU connectors.................................................................... 40
MCU connector details................................................................... 40
Signal description........................................................................... 41
MCU lefthand 66-way connector pinout......................................... 42
MCU righthand 66-way connector pinout....................................... 43
MCU System connector pinout....................................................... 44
MCU Selectronic card pinout................................................ 45
MCU Digital channels............................................................ 46
MCU Digital Group 1...................................................................... 46
Features of MCU Digital Groups 1 and 2....................................... 48
MCU miscellaneous connections.......................................... 51
Battery inputs.................................................................................. 51
Battery outputs............................................................................... 51
MCU communications links.................................................. 52
Serial ports - Logger card............................................................... 52
Serial ports - Application card......................................................... 52
Pit communications........................................................................ 53
Logger card serial port 2A – ECU input.......................................... 53
Logger card serial port 2B – Telemetry.......................................... 54
Logger card serial port 4A – Spare input........................................ 54
Logger card serial port 4B – MCU to Dash..................................... 55
Logger card serial port 5 – TPS receive......................................... 55
Logger card port 6 – CAN switches to MCU................................... 56
Application Card serial port - CAN ............................................... 56
Application Card serial port - Spare................................................ 57
4
Communication connectors.................................................. 60
Download connector....................................................................... 60
Download lead................................................................................ 62
Download path connections........................................................... 63
PC Network.................................................................................... 64
Installation notes
System communications....................................................... 58
Debug port...................................................................................... 58
PiNet............................................................................................... 59
Miscellaneous connections.................................................. 82
Octal passive junction box dimensions........................................... 82
Octal passive junction box connections.......................................... 83
Tyre Performance System (TPS) connections............................... 87
Telemetry connections................................................................... 88
Index
Dash connectors.................................................................... 89
Compact dash connections............................................................ 89
Steering wheel dash connections................................................... 92
Omega dash connections............................................................... 94
System expansion
Sensor wiring information..................................................... 75
Connecting a single ended sensor to a single ended input............ 75
Connecting a single ended sensor to a differential ended input..... 76
Connecting a strain gauge to a differential input............................ 77
Connecting an RTD........................................................................ 78
Connecting a current output sensor............................................... 79
Connecting a voltage output sensor to a single ended input.......... 80
Connecting a voltage output sensor to a differential ended input... 81
The SCU3
Connecting sensors............................................................... 69
Connecting sensors to a Selectronics10V I/O card........................ 71
The MCU
System expansion
The SCU3
Introduction........................................................................... 99
SCU3 specifications....................................................................... 99
SCU3 internal analog debug channels......................................... 100
SCU3 dimensions......................................................................... 101
General points on fitting the SCU3............................................... 102
SCU3 connectors................................................................. 104
SCU3 connector details................................................................ 104
SCU3 Lefthand 55-way connector................................................ 105
SCU3 Righthand 55-way connector............................................. 106
SCU3 connections............................................................... 107
SCU3 Digital Group 1................................................................... 107
SCU3 Digital Group 2................................................................... 108
SCU3 system connections........................................................... 109
SCU3 Selectronic card connections............................................. 110
SCU3 LVDT card connections...................................................... 111
SCU3 Moog/LVDT card connections............................................ 112
SCU3 Pressure scanner card connections................................... 113
SCU3 CAN card connections....................................................... 114
Index
Index.................................................................................... 117
Conditions of use.......................................................................... 121
Contact information............................................................ 122
6
Introduction
The Pi Sigma Elite System is a data acquisition and electronic control system designed around
modular components which have common mechanical and electrical connections.
Pi Sigma Elite System units connect and communicate using a dual-redundant on-car
network.
Pi Sigma Elite System sensors use a standard 5-pin connection for analog sensors.
Pi Sigma Elite Junior
option
A Pi Sigma Elite Junior option is available. The specification for the Pi Sigma Elite Junior is
as per the standard Elite but with only two selectronic cards (16 analog channels) and no
Application card or associated team configurable CAN or serial streams.
specification
The standard specification for a Pi Sigma Elite System is:
nn
nn
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nn
nn
nn
nn
nn
Main Control Unit (MCU)
Looms:
System loom
Front sensor loom
Rear sensor loom
Gearbox split loom
Steering wheel dash or Compact dash and satellite modules, or Omega dash
and Omega LED module
32-channel beacon system
Two wheelspeed sensors
40 analog input channels
8 digital channels
Laptop Ethernet PCMCIA network card
MCU specification
The MCU has the following specification:
nn
nn
nn
nn
nn
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nn
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nn
nn
8
128MB Flash logging memory
One Logger card
One Application Card
Five Selectronic Input/Output (I/O) cards, giving 40 analog input channels
Eight digital channels, (four channels are input only and four channels can be
input or output)
Dual redundant PiNet network ports to connect to other units in the System
100MB 100BaseT Ethernet download port
Serial ports (RS422 and RS232)
Switches to CAN port
Team configurable CAN port
Dual redundant battery supply
hree accelerometers (longitudinal, vertical and lateral)
Pi Sigma Elite Junior
System specification
An example specification for a Pi Sigma Elite Junior System is:
nn
nn
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nn
nn
nn
nn
nn
nn
Main Control Unit (MCU)
System loom
Front sensor loom
Rear sensor loom
Compact dash and satellite modules
32-channel beacon system
Two wheelspeed sensors
16 analog input channels
8 digital channels
Laptop Ethernet PCMCIA network card
MCU specification
The Pi Sigma Elite Junior MCU has the following specification:
nn
nn
nn
nn
nn
nn
nn
nn
nn
nn
128MB Flash logging memory
One Logger card
Two Selectronic Input/Output (I/O) cards, giving 16 analog input channels
Eight digital channels, (four channels are input only and four channels can be
input or output)
100MB 100BaseT Ethernet download port
Serial ports (RS422 and RS232)
Switches to CAN port
Three accelerometers (longitudinal, vertical and lateral)
Typical System
The standard Pi Sigma Elite System can be expanded to include additional cost option
systems such as the Pi Telemetry System and the Pi Tire Performance System. Additional
Octal passive junction boxes can also be added.
A typical Pi Sigma Elite system schematic with some cost options is shown in the next
figure.
Front sensor loom (8 analog inputs)
Pi telemetry
(cost option)
SCU3
(cost option)
Wheelspeed
Wheelspeed
Sigma Beacon
Beacon transmitter
(no-cost option)
Debug
display
lap
code
select
split
to ECU
MCU
Steering wheel dash
Tire Performance System
(cost option)
System loom
OR
Satellite LED
module
Omega dash
ALARM
OIL
Research
Download
KPH
MPH
V
LAP
OR
Gearbox Split loom
Compact dash
Rear sensor loom (8 analog inputs)
Switches to
CAN box
A typical Pi Sigma Elite system showing some options
10
PS
FUEL
BAR
LAP
OIL
WAT
oF
oC
Remote driver
switch
Gear/shift and
Alarm
modules
Specifications
Pi Sigma Elite MCU
specifications
Description
Value
Input Voltage Range1
Supply current
Case Temperature Range
Storage Temperature Range
Environmental
Vibration
Weight
1
+9.0V to +18.0V
1.34A at 12.0V typical
0°C to +60°C
–40°C to +150°C
IP65
Tested using Pi custom profile:
Endurance test,19g for 1 hour on a single axis
850 grams with five Selectronic I/O cards fitted
Requires 11.0 volts to start-up
Part numbers
Item
Part Number
Pi Sigma Elite MCU
Pi Sigma Elite Junior MCU
Pi Sigma SCU3
Pi Sigma download lead (Fischer connector)
Pi Sigma download lead (Autosport connector)
Pi Sigma LVDT I/O card
Pi Sigma Sigma Selectronic I/O card
Pi Sigma Sigma Selectronic10V I/O card
Pi Sigma MOOG/LVDT I/O card
Pi Sigma Pressure scanner I/O card
Pi Sigma Octal Passive Junction box
Pi Sigma CAN I/O card
Steering wheel dash
Pi Sigma Compact dash
PCMCIA Ethernet card (100BaseT)
Switches to CAN interface box
01M-601300
01M-601300-J
Z4001
03A-02561
03A-02562
25M-600384
25M‑6000802
25M-606046
25M-600072
25M-600272
01M-601061
25M-600406
01M-032290-B
01M-032247
31A-0055
01M-032245
1
This Part Number identifies a component without I/O cards fitted.
This version of Selectronic card is no longer available, but may have been installed in
previous Pi Sigma Elite systems.
2
12
Installation
notes
Installation notes
The Pi Sigma Elite System uses Deutsch Autosport and Deutsch Autosport Micro Lite
Harsh Environment connectors.
Deutsch Autosport
connectors
Deutsch Autosport connectors are fitted to the Pi Sigma Elite system components and
looms.
shell
latch
keyways
Deutsch Autosport connector detail
Deutsch Autosport connectors use a rotating sleeve to lock the two halves of the connector
together.
To connect Deutsch Autosport connectors:
1
2
3
4
Make sure that the two connectors are compatible by checking that the number
of contacts and the position of the keyways is the same for both connectors.
Align the keyways, and bring the two halves of the connector together.
Apply light pressure to the connector as you slowly turn the knurled sleeve.
When the latches connect with the sleeve, keep turning until you hear the
sleeve click.
Installation notes
15
Installation notes
General connector information
knurled sleeve
latch
Connecting a Deutsch Autosport connector
Deutsch Autosport connector contacts
The contacts of a Deutsch Autosport connector are labelled on the connector itself. The
contact numbers are given on the outside and inside of the connector.
16
The part number is made up using the AS range reference followed by the style, the shell
size, the contact arrangement, the insert type and the shell keyway e.g. AS108-35PN.
The modification code is only applicable if a special modification has been made to the
connector.
AS * ** – ** * * – ***
Modification code
Range reference
Style:
0 = 2-hole flange receptacle (front fixing)
1 = Inline receptacle
2 = 2-hole box mount PCB receptacle
6 = Free plug
8 = Cap for plug
9 = Cap f or receptac le
Shell size
Contact arrangement
Insert type: P = pin, S = socket
Shell keyways:
N = Red (standard)
A = Yellow (standard)
D = Green (standard)
B = Blue (alternative)
C = Orange (alternative)
U = Violet
(Universal for test
harnesses)
Deutsch Autosport part numbering
Installation notes
17
Installation notes
Deutsch Autosport part
numbering
Autosport connector shell size and contact arrangements
The shell size and contact arrangement are shown below. Three sizes of contact are
available: size 22, size 20 and size 16. The table below shows which sizes can be fitted.
18
Shell size Contact arrangement
Size 22
8
8
10
10
12
12
12
14
14
14
16
16
16
18
18
20
20
20
20
22
22
22
24
24
24
–
6
–
13
–
–
22
–
–
37
–
–
55
–
66
–
–
–
79
–
–
100
–
–
128
98
35
98
35
04
98
35
97
19
35
08
26
35
32
35
16
39
41
35
21
55
35
29
61
35
Number of contacts
Size 20
Size 16
3
–
6
–
–
10
–
8
19
–
–
26
–
32
–
–
37
41
–
–
55
–
–
61
–
–
–
–
4
–
–
4
–
–
8
–
–
–
–
16
2
–
–
21
–
–
29
–
–
Deutsch Autosport Micro Lite Harsh Environment (HE) connectors are used on some
sensors, some components and sections of the looms.
Deutsch Autosport Micro Lite HE connector shell styles
The Deutsch Autosport Micro Lite HE shell styles used in the Pi Sigma Elite System loom
and some sensors are inline receptacles and free plugs. The inline receptacles are fitted
with five socket contacts and the free plugs are fitted with five pin contacts.
Inline receptacle - Shell style1
Free plug - Shell style 6
heat shrink boot
heat shrink boot
coloured ring
(denoteskeyway)
latch
locking
mechanism
coloured ring
(denoteskeyway)
Deutsch Autosport Micro Lite HE connectors
Deutsch Autosport Micro Lite HE connector contacts
The contact positions are counted from 1–5, with contact number 1 further identified with
a white circle.
Inline receptacle –Type 1
1
front view
Plug Type 6
1
front view
Counting Deutsch Autosport Micro Lite HE contacts
Installation notes
19
Installation notes
Deutsch Autosport
Micro Lite HE
connectors
Deutsch Autosport
Micro Lite HE part
numbering
The part numbering system for the Deutsch Autosport Micro Lite HE connectors is shown
in the next figure.
The part number is made up using the ASL range reference followed by the style, the
shell size, the contact arrangement, the insert type, the shell keyway and the letters HE
e.g. ASL606-05PN-HE. The modification code is only applicable if a special modification
has been made to the connector.
ASL *
*
*
Range reference
Modification code
Style:
0 = 2-hole flange receptacle
1 = Inline receptacle
2 = 2-hole flange withPCB
contacts
6 = Free plug
Harsh Environment
Shell keyways:
N = Red (standard)
A =Yellow
B = Blue
C = Orange
D = Green
E = Grey
Shell size
Contact arrangement
Insert type: P = pin,S = socket
Deutsch Autosport Micro Lite HE parts numbering
Contact size
Only one contact size (socket and pin) is available to fit the Deutsch Autosport Micro Lite
HE connectors. The contact crimp connection can accommodate cable gauges of 22, 24,
26 and 28 AWG.
20
Most cars have the negative terminal of the battery connected to the chassis, making a
‘negative earth’.
Battery connections are often made through a Master Switch, which may be fitted in
either the negative or positive, or both, supply leads from the battery. The Master Switch
disconnects all electrical power in an emergency, and is required by the regulations
governing most motor sports.
When connecting an MCU you should make sure that:
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the MCU remains powered when the engine is turned off;
the MCU does not drain the car battery too much;
the supply voltage to the MCU remains high enough for operation.
When connecting an MCU to the battery:
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make all connections to, or as near as possible to, the battery terminals;
use a ‘star point’ for connections to the battery;
keep the wire between the battery terminal and the star point as short as is
possible. Use heavy gauge wire, or braiding for this connection;
use 20-gauge or 22-gauge wire for connections between an MCU, and the
star point.
CAUTION: Before making any connections to the battery, make sure you are
confident with any looms that you have made. Remove power from the MCU
before making any alterations.
MCU power
requirements
The MCU needs a supply voltage greater than 11.0 volts to start-up and between 9.0 volts
and 18 volts to operate correctly. If the supply voltage is outside the 9.0 volts and 18 volts
limits, the MCU will switch off.
Depending upon the loads that you have connected, the current consumption will be
between 1 amp and 5 amps. The battery +ve and battery –ve supply lines are fitted with
5 amp fuses inside the MCU.
Installation notes
21
Installation notes
Connecting the MCU
Star points
All Pi Sigma Elite system battery connections must only be connected to the battery at one
point. Multiple connections to a length of wire or the chassis, will introduce noise and upset
the readings from sensors.
Star points are single connection points for the positive and negative terminals of the
battery. Connecting equipment at the star point reduces the variation in supply voltage as
current returns to the battery from other electrical components.
22
The most common form of electrical system for vehicles consists of a battery and an
alternator, but no electrical starter motor. Power to the electrical components is made
through the Master Switch, and a second three position ignition switch.
If your vehicle has this type of electrical system, then connect your Pi Sigma Elite System
using the arrangement shown below. Use 20 or 22 gauge twisted wire to the Pi Sigma
Elite System.
off
to Sigma Elite System
off
power
ignition
star point
to Sigma Elite System
battery
chassis
Connecting a System to the battery
Installation notes
23
Installation notes
Connecting systems
Connecting the MCU to
a vehicle battery
The MCU has dual redundant battery connections.
WARNING: You must fit a backup battery if you are using safety critical or control
applications. For details refer to the section Fitting a backup battery.
Connecting the MCU
Four pins connect the MCU to your vehicle’s battery star points. Two pins are on the
lefthand 66–way and two pins are on the righthand 66–way connector. These battery
connections provide all of the power to the MCU and are listed in the next table.
MCU battery connections
Pin
Connection
Function
L9
L24
R9
R24
Car battery positive star point
Car battery negative star point
Battery +ve
Battery –ve
Battery +ve
Battery –ve
Pins L9 and R9 are cross-coupled inside the MCU, using diodes. Pins L24 and R24 are
commoned inside the MCU. These arrangements ensure that the MCU functions if one of
the battery supply lines breaks. The input is protected against reversed battery connections
and transients of ±40 volts.
24
Installation notes
The internal connections are represented in the next figure.
66-way connectors
on MCU
5 amps
5 amps
5 amps
5 amps
L9
R9
L24
MCU
circuits
Supply for
sensors
5 amps
R24
Representation of internal MCU battery connections
When you install the MCU, use the figure below as a guide. If your vehicle has a master
switch configuration, refer also to the figure in section Connecting systems.
Heavy gauge wire or braid
22-gauge twisted together
L9
L24
star point
R9
R24
battery
chassis
Battery connections (showing pin numbers for the MCU)
Installation notes
25
Fitting a backup battery
Some vehicles are fitted with an electrical starter motor. Under starting conditions, the
battery voltage may drop to as low as 7 volts. A Pi Sigma Elite MCU will turn off if the supply
voltage drops below 9.0 volts.
To prevent your system from turning off, you can fit a separate battery, to maintain sufficient
voltage for the System to operate.
applications.
Pi Research can supply a suitable backup battery. Contact Pi Research for more details.
A suitable backup battery connection arrangement is shown below.
off
backup battery
to Sigma Elite
Righthand connector
to Sigma Elite Righthand
connector
off
power
to Sigma Elite Lefthand
connector
star point
ignition
to electrical systems
to Sigma Elite
Lefthand connector
battery
chassis
Connecting a backup battery
26
Ground loops
Your car may be fitted with an Engine Control Unit (ECU). Pi Sigma Elite Systems can be
connected to ECUs, enabling them to share information.
Most ECUs will have a ground connection which may be chassis ground rather than directly
to negative terminal of the battery.
MCU
star point
battery
ground loop
ECU
chassis
Ground loop
Connecting the ground of a Pi Sigma Elite System to the ground connection of an ECU may
create a ‘ground loop’. Ground loops can cause noise and incorrect sensor readings.
Ground loops can also occur if the shell of a connector touches the chassis. This is why it
is important to fit any protective rubber boots supplied with connectors.
Installation notes
27
Installation notes
ECU systems
loom screen
MCU
battery
vehicle chassis
ground loop
chassis
Connector shell
touches the
chassis
Ground loop caused by connector touching the chassis
Testing for ground loops
Ground loops can be avoided by making careful connection to battery star points. Before
using your System, or if you are having problems with noise appearing in data from
sensors, you should test for ground loops.
To test for a ground loop:
1
Disconnect the System from the car battery.
This is easily done by disconnecting the ECU connector on the System loom.
2
Using a multimeter, measure the resistance between the MCU case (or SCU3
case) and the chassis.
If the resistance reading is low, then there is an electrical path to the chassis.
3
4
5
28
Starting with the sensor, loom or junction box that is furthest away from the
MCU (or SCU3), unplug ONE component at a time and measure the resistance
between the MCU case (or SCU3 case) and the chassis.
Repeat step 3 until the resistance reading is infinite.
Carefully check the component that you last disconnected for signs of
shorting.
Installation notes
multimeter
loom screen
MCU
battery
vehicle chassis
chassis
Testing for a ground loop
If the resistance reading is greater than 10k ohms, then your System is electrically isolated
from the chassis. If you are still experiencing noise problems, then you should check that
boots are fitted to all connectors, and that no connector is making contact with the chassis
through vibration.
Avoiding ground loops
The most common source of a ground loop is a grounded sensor. Ensure that all sensors
used are either isolated from the chassis (or engine), or if that is not possible then isolate
the screen connection from that sensor.
Installation notes
29
Installation information
This section gives information on how to fit the Pi Sigma Elite System and loom to your
car.
General points on fitting
looms
The looms supplied by Pi Research are made from ‘55 spec’ military airframe wire that can
withstand temperatures up to 150°C. Looms are terminated with Deutsch Autosport and
Deutsch Autosport Micro HE connectors.
All looms are screened and covered with heatshrink sleeve unless otherwise specified.
If you are making your own looms, then ask Pi Research for help with selecting suitable
wire and connectors. Using poor quality wire and connectors may affect the performance
and reliability of your Pi Sigma Elite System.
Fitting looms
When fitting looms to your car, consider the following points:
nn
nn
nn
Care should be taken when routing looms near the engine. Make sure that your
looms do not make contact with hot engine components such as exhaust pipes,
manifolds, turbochargers or brake components. Excessive heat will burn the
protective heatshrink layer, and expose the inner screen and wires. This may
lead to intermittent electrical faults and noise.
When you install your looms, make sure that their position will not be affected
by localised heating when the car is stationary.
Remember that brake components can get very hot, and it will only be apparent
after you have been running your car.
The easiest way to install looms is to make all connections to the MCU first, and work
away, towards the SCU3 (if fitted), junction boxes and sensors. Generally looms become
thinner further away from the MCU. If you find that you have too much loom, a thinner loom
is easier to coil up.
30
Notes
nn Allow looms to follow their natural curvature. Do not force them around very
tight radii.
nn Where a loom passes through a hole in the chassis or bulkhead, make sure
that there is no risk of the loom being cut or abraded.
Making your own looms
When making your own looms, use a spare length of cable, and route it exactly as the
finished loom. Use off‑cuts of cable to create branches and carefully mark the main loom
where the branches occur. By spending time adjusting your dummy loom, you can achieve
the optimum installation for your vehicle.
If you are supplying a loom specification for Pi Research, take measurements from the
dummy loom to create an engineering drawing. Pi Research measure looms from the face
of connectors, and to the centre of loom branches.
Installation notes
31
Installation notes
In general, looms should not be routed next to sources of electrical interference i.e. ignition
coils, plug leads, alternators, fuel pumps, telemetry equipment, especially antennas, and
ECUs. If you have to route a loom near any of these, try to avoid parallel runs.
the MCU
When fitting the MCU you should consider the following pointsThe MCU is resistant to
water, but after prolonged exposure, water, oil and fuel may eventually work their way
inside the MCU. Select a position where the MCU will not be in constant contact with any
fluid.
nn
nn
nn
32
The MCU must be protected from vibration. Use the anti-vibration mounts.
Make sure that air can flow over the MCU to keep it below +60°C.
Try not to place the MCU near sources of electrical interference e.g. ignition
coils, plug leads, ECUs, alternators and telemetry antenna.
Orientation
The MCU contains three identical accelerometers which are used to measure acceleration
about three axes: longitudinal, vertical and lateral. The accelerometers have corresponding
channels in the Pi Workshop Software. The channel names in the software are Long Acc
02.00.61, Vertical Acc 02.00.60 and Lateral Acc 02.00.59.
The MCU standard orientation axes are shown in the following figure. In the figure,
connector L is the lefthand 66-way connector, R is the righthand 66‑way connector,
and S is the system connector.
Vertical
acceleration
+ve
Longitudinal
acceleration
—ve
Lateral
acceleration
—ve
Front of car
L
S
Lateral
acceleration
+ve
R
Longitudinal
acceleration
+ve
Vertical
acceleration
—ve
MCU standard orientation axes
Installation notes
33
Installation notes
Installing the MCU
Re-orientation
You can mount the MCU in a different orientation to the standard. The three axes of
acceleration (longitudinal, vertical and lateral) will still be measured, but by a different
accelerometer to that used in the standard orientation. The channel names in Pi Workshop
Software remain the same, although they will be measuring acceleration along a different
axis.
You must set up a math channel in Pi Workshop Software to make use of the information
from each channel. Refer to the Pi Workshop User Guide for information on how to set
up a math channel to make use of the acceleration information if you fit the MCU in a non
standard orientation.
Fitting an MCU
1 Select a suitable location for the unit.
Make sure that the location does not exceed 60°C. Hot weather and localised heating
effects will add to the ambient air temperature.
2
Use the mounting lugs and AV mounts supplied to secure the MCU.
CAUTION: The MCU case acts as a heatsink for internal electronic components. It
is important that air can flow around all sides of the MCU.
3
34
When you have fitted the unit, make sure that air can flow all around it.
Installation notes
MCU Dimensions
6.22" (158.00)
5.43" (138.00)
1.65" (42.00)
0.39"
(10.00)
5.51" (140.00)
4.53" (115.00)
0.52"
(13.25)
Use the following diagram to help you fit a Pi Sigma Elite MCU.
6.75" (171.50)
1.85" (47.00)
1.85" (47.00)
0.86"
(22.00)
Pi Sigma Elite MCU (dimensions in inches and millimetres)
Installation notes
35
36
The MCU
The MCU
MCU internal analog debug channels
The MCU
The MCU has a set of internal analog debug channels which monitor the health of the units.
To view the channels they must be included in the logging table of the unit. The maximum
rate that they can be logged at is 100Hz, but to conserve logging memory they should be
logged at 10Hz or below. The most important channels to log are the Box battery voltage
and Box temperature. Include the other channels if you can.
MCU internal analog
debug channels
The MCU internal analog debug channel names are given in the next table.
MCU internal analog debug channel names
Channel
Pi PC software name
MCU Reference voltage (2.5V)
PSU temperature (calibrated at 10mV/°C)
Battery backup voltage (3.0V – 3.6V)
for logging RAM
Longitudinal Accelerometer
Vertical Accelerometer
Lateral Accelerometer
Box temperature on Nose card
Power supply +5V
Power Supply +12V
Power supply –12V
Box battery voltage (9V–18V)
Box battery input current
ADC Ref.02.00.56
PSU Temp.02.00.57
Backup BattV.02.00.58
Long Acc.02.00.61
Vertical Acc.02.00.60
Lateral Acc.02.00.59
Temp.02.00.03
+5 Volts.02.00.50
+12 Volts.02.00.51
–12 Volts.02.00.52
Voltage.02.00.02
Supply Current.02.00.54
The MCU
39
MCU connectors
This section gives information on the connectors used on the MCU and the pin out details
for each connector. The figure below shows the position of the connectors on the MCU.
Lefthand 66-way
(yellow ring)
System
Righthand 66-way
(red ring)
AS218-35PA
AS218-35SN
AS218-35PN
MCU connector identification
MCU connector details
The MCU is fitted with Deutsch Autosport connectors which are listed in the next table.
MCU Deutsch Autosport connectors
Description
MCU Connector
Loom Mating connector
Lefthand 66-way
Righthand 66-way System connector AS218-35PA
AS218-35PN AS218-35SN AS618-35SA
AS618-35SN
AS618-35PN
In the following tables the pin number prefix in the Pin column has the following meaning:
L
R
S
means the MCU Lefthand 66-way connector
means the MCU Righthand 66-way connector
means the MCU System connector
e.g. L13 means pin 13 on the lefthand 66-way connector.
40
Signal description
The Elite MCU has five slots for Input/Output (I/O) cards. The Elite MCU has five
Selectronic I/O Cards fitted as standard, plus a Logger Card and an Application Card.
Two of the I/O Cards are connected to the Logger Card and the remaining three I/O Cards
are connected to the Application Card.
The MCU
The slot positions used for the five I/O cards are shown in the next table. The table also
shows how the cards are identified in the Mnemonic column ident column of the connector
pinout tables on the following pages.
MCU I/O card positions
MCU I/O slot
Mnemonic column ident
MCU card designation
1
2
3
4
5
A1–
L1–
A2–
L2–
A3–
Application Card – Card 1
Logger Card – Card 1
Logger Card – Card 2
The MCU
41
MCU lefthand 66-way
connector pinout
Pin
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L27
L28
L29
L30
L31
L32
L33
Mnemonic
A2–1E
A2–GNDA
EXC1
A2–1A
A2–1B
A2–1D
NETAL
GND1
LBAT+
L1–1A
L1–1E
L1–1B
A2–1C
NETBL
DEBTX
DEMDE
L1–2A
L1–2E
L1–2B
L1–1D
L1–1C
SIG1A
DEBRX
LBAT–
L1–GNDA
L1–3B
L1–3D
L1–3C
L1–2D
L1–2C
SIG1B
C3–3B
C3–3A
Signal description
App I/O Card 2 group 1 signal E
App I/O Card 2 group 1 signal ground*
Logger card excitation 1
App I/O Card 2 group 1 A
App I/O Card 2 group 1 B
App I/O Card 2 group 1 D
PiNET A left**
Logger Digital group 1 ground
Lefthand battery power +ve
Log I/O Card 1 group 1 signal A
Log I/O Card 1 group 1 signal E
Log I/O Card 1 group 1 signal B
App I/O Card 2 group 1 signal C
PiNET B left**
MCU to Debug
Select card for debug
Log I/O Card 1 group 2 signal D
Log I/O Card 1 group 2 signal C
Logger digital input 1A
RS232 debug (Debug to MCU)
Lefthand battery power –ve
Analogue ground return*
Logger digital input 1B
App I/O Card 2 group 3 signal B
App I/O Card 2 group 3 signal A
* Connect high current sensors here
Pin
L34
L35
L36
L37
L38
L39
L40
L41
L42
L43
L44
L45
L46
L47
L48
L49
L50
L51
L52
L53
L54
L55
L56
L57
L58
L59
L60
L61
L62
L63
L64
L65
L66
Mnemonic
L1–3A
L1–3E
L1–4D
L1–4B
L2–1B
L2–1C
A2–3D
A2–3C
A2–3E
L1–GNDB
L1–4C
L2–4B
L2–4C
L2–2B
L2–1D
L2–1E
L2–1A
L1–4A
L1–4E
L2–4D
L2–3B
L2–2D
L2–2C
L2–2A
L2–4A
L2–4E
L2–3D
L2–3C
L2–GNDB
L2–2E
L2–GNDA
L2–3E
L2–3A
** Route in Lefthand loom
The Signal function is determined by the type of I/O cards fitted in the Elite MCU.
42
Signal description
Log I/O Card 1 signal ground*
Log I/O Card4 group 2 signal E
MCU righthand 66-way
connector pinout
Mnemonic
A2-2E
A2-GNDB
EXC2
A2-2A
A2-2B
A2-2D
NETAR
GND2
RBAT+
C1-1A
C1-1E
C1-1B
C3-2C
NETBR
N/C
A-GND
A1-2A
A1-2E
A1-2B
A1-1D
A1-1C
SIG2A
N/C
RBAT–
A1-GNDA
A1-3B
A1-3D
A1-3C
A1-2D
A1-2C
SIG2B
A2-4B
A2-4A
Signal description
App I/O Card 2 group 2 A
App I/O Card 2 group 2 B
App I/O Card 2 group 2 D
PiNET A right**
Logger Digital group 2 ground
Righthand battery power +ve
PiNET B right**
Not connected
Additional Ground pin
App I/O Card 1 group 1 signal D
Logger Digital input 2A
Not connected
Righthand Battery power –ve
Logger Digital input 2B
Pin
Mnemonic
Signal description
R34
A1-3A
R35
A1-3E
R36
A1-4D
R37
A1-4B
R38
A3-1B
R39
A3-1C
R40
A2-4D
R41
A2-4C
R42
A2-4E
R43
A1-GNDB
Analogue ground return *
R44
A1-4C
R45
A3-4B
R46
A3-4C
R47
A3-2B
R48
A3-1D
R49
A3-1E
R50
A3-1A
R51
A3-4A
R52
A3-4E
R53
A3-4D
R54
A3-3B
R55
A3-2D
R56
A3-2C
R57
A3-2A
R58
A3-4A
R59
A3-4E
R60
A3-3D
R61
A3-3C
R62
A3-GNDB
App I/O Card 3 signal ground*
R63
A3-2E
R64
A3-GNDA
App I/O Card 3 signal ground*
R65
A3-3E
R66
A3-3A
** Route in Righthand loom
The MCU
Pin
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R 18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
The Signal function is determined by the type of I/O cards fitted in the Elite MCU.
The MCU
43
MCU System connector
pinout
Pin Mnemonic
Signal description
S1
APP-SOB4/RX Application card SOB4/RX
S3
NETAL
S2
S4
S5
S6
APP-SOA4/TX Application card SOA4/TX
EXC3
PiNet duplicates
APP-S1A4/CH Application card S1A4/CH
APP-S1B4/CL Application card S1B4/CL
Pin Mnemonic Signal description
S34 ENET-TX– 100BaseT Ethernet (MCU to PC)
S35 CASE
Connection to case
S37 IO4B
Logger digital I/O 4B
S36 SIG4C
S38 IO4A
S39 PITGND
Logger digital Input 4C
Logger digital I/O 4A
Ground connection
S7
NETAR
PiNet duplicates
S40 SOA4/TX
Logger serial group 4 RS422/232
S9
NETBL
PiNet duplicates
S42 JBEN3#
Junction box enable 3
S8
NETBR
S10 EXC4
S11 A0-2A
S12 A0-1B
PiNet duplicates
App Card Mezzanine Card 2A
Logger serial group 3 RS232
Power ground return
S47 TX5
Fused battery –VE
S18 A0-1E
S44 TX3
Logger serial group 1 RS422/232–not supported
S15 FBAT1–
S17 ENET-RX+
S43 ENET-TX+ 100BaseT Ethernet (MCU to PC)
S45 SOA1/TX
Card Mezzanine Card 2B
S16 FBAT1+
App Card Mezzanine Card 1B
S13 A0-2B App
S14 GND4A
S41 JBEN1#
Fused battery +VE
S46 SIOA2
S48 SIA2
S49 SIB4
100BaseT Ethernet (PC to MCU) S50 SIA4
App Card Mezzanine Card 1E
S51 RX3
Logger serial group 2A RS422 Output
Logger serial group 2A RS422 Input
Logger serial group 4 RS422/CAN
Logger serial group 4 RS422/CAN
S19 A0-1D
App Card Mezzanine Card 1D
S52 SIA1
S21 GND4B
Power ground return
S54 LED
Pi Detect LED. DO NOT CONNECT
Fused battery –VE
S56 SIB2
Logger serial group 2A RS422 Input
S20 A02D
App Card Mezzanine Card 2D
S22 GND3B
Power ground return
S24 FBAT2+
Fused battery +VE
S23 FBAT2–
S25 ENET-RX–
S53 SIOB2
S55 TX6
S57 SOB4/RX
App Card Mezzanine Card 2E
Logger serial group 2B RS232/422 Out
S59 SIB1
S28 IO3B
Logger Digital I/O 3B
S61 CANH6
S30 GND3A
Logger Digital I/O 3A
S60 SOA2/TX
S62 RX6
Logger serial group 6 CANH
Power ground return
S63 TPOUT0B Analogue Debug Signal. DO NOT CONNECT
S65 RX5
S31 TERMDIS#
Disable PiNet termination
S33 JBEN2#
S32 JBEN4#
Logger serial group 4 RS422/232
App Card Mezzanine Card 1A
S29 IO3A
100BaseT Ethernet (PC to MCU) S58 SOB1/RX
S26 A0-1A
S27 A0-2E
Logger serial group 2B RS422 Output
S64 SOB2/RX
Logger serial group 2B RS232/422 Out
S66 CANL6
Logger serial group 6 CANL
The Signal function is determined by the type of I/O cards fitted in the MCU.
44
MCU Selectronic card pinout
The table shows the pinouts for the Selectronic I/O cards in the MCU
Log I/O
Card 1
App I/O
Card 2
Log I/O
Card 2
App I/O
Card 3
R10
L10
L4
L50
R50
1B
SIG1A+
Input
Differential analog input+
R12
L12
L5
L38
R38
1C
SIG1A–
Input
Differential analog input–
R21
L21
L13
L39
R39
1D
SIG1B+
Input
Single ended analog input
R20
L20
L6
L48
R48
Signal ground
1E
GND1
–
R11
L11
L1
L49
R49
2A
EXC2A
Output Prog. Excitation,
regulated, minimum load 120R
R17
L17
R4
L57
R57
2B
SG2A+/R
Input
Differential analog input+/RTD
R19
L19
R5
L47
R47
2C
SIG2A–
Input
R30
L30
R13
L56
R56
2D
SG2B+/R
Input
Single ended analog input+/RTD
R29
L29
R6
L55
R55
2E
GND2
–
Signal ground
R18
L18
R1
L63
R63
3A
EXC3A
Output Prog.Excitation, regulated,
minimum load 120R
R34
L34
L33
L66
R66
3B
SIG3A+
Input
R26
L26
L32
L54
R54
3C
SIG3A–
Input
R28
L28
L41
L61
R61
R27
L27
L40
L60
R60
R35
L35
L42
L65
R65
R51
L51
R33
L58
R58
3D
SIG3B+
Input
3E
SG3B–/I
Input
4A
EXC4A
4B
SIG4A+
Input
R37
L37
R32
L45
R45
4C
SIG4A–
Input
R44
L44
R41
L46
R46
R36
L36
R40
L53
R53
R52
L52
R42
L59
R59
R25
R4. 3
L25
L43
L2
R2
L64
L62
R64
R62
/ Current input
Output Prog. Excitation, regulated,
minimum load 120R
4D
SIG4B+
Input
4E
SG4B–/I
Input
/ Current input
Signal ground
Signal ground
GNDA
GNDB
App I/O
Card 1
The MCU
The MCU
Group Mnemonic I/O
Signal description
1A
EXC1A
Output Prog. Excitation, regulated,
minimum load 120R
OR 0.5A high power unregulated
45
MCU Digital channels
The MCU has eight fixed digital channels that can be used for wheelspeed sensors, crank
sensors and any sensor that provides a digital output signal. The channels are arranged
into four Groups, with each group providing different signal conditioning and excitation
voltages to match different digital sensors.
MCU Digital Group 1
MCU Digital Group 1 channels (1A and 1B) are input only. MCU Digital Group 1 inputs
have programmable threshold levels, programmable hysteresis, programmable pre-scalar,
programmable 125kHz–1MHz clock, fixed 10k ohm pull-up, 0–5V or 0–15V input range and
switchable 10kHz or 2kHz input filter. You use Pi Workshop PC software to configure the
channels. The Pi Workshop PC Software includes a calculator which helps to ensure that
the settings for these digital channels are optimized.
46
Pin
Mnemonic Signal description
Normally used for
L3
S4
L22
L31
L8
EXC1
EXC3
SIG1A
SIG1B
GND1
Programmable 2.5V to 12.5V
Front right wheelspeed
Rear right wheelspeed
Ground for Digital Group 1 signals
Logger Digital Group 1 ground
MCU Digital Group 2
Normally used for
R3 EXC2
R22 SIG2A
R31 SIG2B
R8 GND2
Front left wheelspeed
Rear left wheelspeed
Logger Digital Group 2 ground
The MCU
47
The MCU
MCU Digital Group 2 channels (2A and 2B) are input only. MCU Digital Group 2 inputs
have programmable threshold levels, programmable hysteresis, programmable pre-scalar,
programmable 125kHz–1MHz clock, fixed 10k ohm pull-up, 0–5V or 0–15V input range and
switchable 10kHz or 2kHz input filter. You use Pi Workshop PC software to configure the
channels. The Pi Workshop PC Software includes a calculator which helps to ensure that
the settings for these digital channels are optimized.
Features of MCU Digital
Groups 1 and 2
This section gives a brief explanation of programmable hysteresis, programmable prescalar values and the programmable clock.
Programmable
threshold and
hysteresis
Input voltage
levels
Input
Programmable
pre-scalar value
%
0–5V
0–15V
Count
1–16
(in steps of 1)
Programmable
timer
Count rate
Representation of Digital Groups 1 and 2 inputs
Programmable hysteresis
Digital inputs can suffer from noise from electrical interference. Programmable hysteresis
reduces the effect of noise by setting thresholds above which input voltages must rise and
fall to register a valid logic 1 and logic 0.
Using the Pi Workshop PC software you select a value between 20% and 80% of a
reference voltage of 4.1V as the threshold voltage. You then select a hysteresis value of
between 4% and 40% of the selected threshold voltage. The software will prevent selection
outside of these limits, and will not allow invalid combinations to be entered.
Half the hysteresis value is then added to the threshold value, and half the value is
subtracted from threshold value. The resultant two voltages are the values above and
below which the input voltage must rise and fall to register as a logic 1 and a logic 0. An
example is shown below.
In the example, the threshold voltage is 61% of the 4.1V reference, which gives a value of
2.5V. The hysteresis value is set to 8% of the threshold value 2.5V, which is 200mV.
48
100mV is added to the threshold voltage to give an upper value of 2.6V, and 100mV is
subtracted from the threshold value to give a lower hysteresis value of 2.4V.
Input
voltage
2.6V
Threshold
voltage
2.5V
Logic 1
Logic 0
Signal
used by
the MCU
Logic 1
Logic 0
The MCU
2.4V
Logic 0
Example of programmable hysteresis
A logic 0 input can only change state to a logic 1 input if the input voltage rises above 2.6V.
It will remain a logic input 1 until the voltage drops to 2.4V.
Programmable pre-scalar values and programmable clock
The maximum input frequency that the signal processing section of the digital I/O card can
accept is 1kHz. You use a pre-scalar value that will divide the frequency of the input signal
down to less than 1kHz. You then set a programmable timer to a value that will count the
time between pulses after the division has taken place.
The MCU
49
MCU Digital Group 3
MCU Digital Group 3 has two channels (3A and 3B) which can be software configured as
input or output channels. Digital Group 3 inputs have fixed slice levels (low level guaranteed
at 0.55V; high level guaranteed 2.0V), fixed hysteresis (0.4V minimum), switchable 2mA or
10mA current limited output, switchable 10k ohm pull-up, fixed 2kHz input filter. You use
Pi Workshop PC software to configure the channels.
Pin
Mnemonic
Signal description
Normally used for
S4
S29
S28
S30
S22
EXC3
IO3A
IO3B
GND3A
GND3B
Logger Digital I/O 3A
Logger Digital I/O 3B
Power ground return
Power ground return
Split beacon input†
Spare
The end-of-lap beacon signal generated by the Pi Sigma 32-channel beacon receiver is
connected directly to the ECU via the wiring loom. It is NOT connected to the MCU.
†
MCU Digital Group 4
MCU Digital Group 4 has two channels (4A and 4B) which be can software configured
as input or output channels. They use the same excitation voltage. Digital Group 4 inputs
have fixed slice levels (low level guaranteed at 0.55V; high level guaranteed 2.0V), fixed
hysteresis (0.4V minimum), switchable 2mA or 10mA current limited output, switchable
10k ohm pull-up, fixed 2kHz input filter. You use Pi Workshop PC software to configure
the channels.
50
Pin
Mnemonic
Signal description
Normally used for
S10
S37
S38
S21
S14
EXC4
IO4B
IO4A
GND4B
GND4A
Digital I/O 4B
Digital I/O 4A
Power ground return
Power ground return
Switch level input
Switch level input
MCU miscellaneous connections
In the following tables, the pin number prefix in the Pin column means:
nn
nn
nn
L means the MCU Lefthand 66-way connector
R means the MCU Righthand 66-way connector
S means the MCU System connector
The MCU
Battery inputs
Pin
Mnemonic
Signal description
Normally used for
L9
L24
R9
R24
LBAT+
LBAT–
RBAT+
RBAT–
Battery power+
Battery power–
Battery power+
Battery power–
Lefthand battery input +ve
Lefthand battery input –ve
Righthand battery input +ve
Righthand battery input –ve
Pin
Mnemonic
Signal description
Normally used for
S16
S15
S24
S23
FBAT1+
FBAT1–
FBAT2+
FBAT2–
Fused battery power
Fused battery power
Fused battery power
Fused battery power
80mA fused battery power out
–ve for fused battery power out
80mA fused battery power out
–ve for fused battery power out
Battery outputs
The MCU
51
MCU communications links
The MCU supports a number of serial communications ports. Each port has its own
characteristics which are selected via a combination of hardware and software (Pi Workshop)
to give a different physical layer.
Serial ports Logger card
The serial ports on the Logger card are summarised in the table below.
Port Function
Mode
2A
ECU input 2B
Telemetry
3
ADR
4A
Spare
4B
Dash
5
Spare
Tire Performance System (TPS)
OR Octal serial junction box (OSJB)
6
Serial input/output
6
CAN switches
RS422 out, RS422 in
RS232 out, RS232 in
RS232 out 38,400 baud max
RS232 in 38,400 baud max
RS232, RS422 or TTL, Input
RS232 or RS422
RS232 out
RS422 in
RS422 in
As Port 3, but no software support
CAN
Serial ports Application card
The serial ports on the Application card are summarised in the table below.
52
Port
Function
Comment
ECU
Spare
CAN
Serial
Requires team specific code
Requires team specific code
Pit communications
Pin
Mnemonic
Description
Function
S43
S34
S17
S25
ENET-TX+
ENET-TX–
ENET-RX+
ENET-RX–
MCU to PC+
MCU to PC–
PC to MCU+
PC to MCU–
100BaseT Ethernet
100BaseT Ethernet
100BaseT Ethernet
100BaseT Ethernet
The MCU
This is the car to pit communication port. It uses 100BaseT Ethernet. The MCU detects the
Ethernet connection automatically and starts the download.
Logger card serial
port 2A – ECU input
This port can be used for fixed transmit and fixed receive operation at RS422 levels.
The port has the following configuration:
nn
nn
nn
Capable of 1Mbps operation
Fixed RS422 transmit and receive
120 Ohms termination on RS422 receive
Pin
Mnemonic
Description
Function
S48
S56
SIA2
SIB2
ECU to MCU
ECU to MCU
RS422 transmit A
RS422 transmit B
The MCU
53
Logger card serial
port 2B – Telemetry
The MCU provides an RS232 communications link to connect to a telemetry system.
nn
nn
nn
Adjustable baud rate up to 115200 baud
Bi-directional
Fixed RS232 layer
Pin
Mnemonic
Description
Function
S64
S60
SOB2/RX
SOA2/TX
Radio to MCU
MCU to Radio
RS232 to the MCU
RS232 MCU to the telemetry system
Logger card serial
port 4A – Spare input
nn
nn
RS422
Software configurable to run at up to 1Mbps.
Configuration
54
Pin
Mnemonic
Description
Function
S50
S49
SIA4
SIB4
Spare
Spare
Serial 4 RS422 transmit A
Serial 4 RS422 transmit B
Logger card serial
port 4B – MCU to Dash
This port can be used for fixed transmit operation at RS422, or RS232 transmit and receive
levels. Standard configuration is RS422 transmit.
Capable of 921600 baud operation
Software configurable for RS422 transmit or RS232 transmit and receive
120 Ohms termination on RS422
The MCU
nn
nn
nn
Configuration
Pin
Mnemonic
Description
Function
S40
S57
SOA4/TX
SOB4/RX
MCU to Dash
MCU to Dash
RS422 transmit A
RS422 transmit B
Logger card serial
port 5 – TPS receive
The receive side of this port is used for Tire Performance System (TPS) RS232 input. The
transmit side of this port is allocated as an RS232 output from the MCU as a spare.
Pin
Mnemonic
Description
Function
S65
S47
RX5
TX5
TPS to MCU
Spare
RS232 TPS to MCU
RS232 transmit
The MCU
55
Logger card port 6 –
CAN switches to MCU
nn
nn
Fixed CAN layer
Software configurable to run at up to 1Mbps.
Configuration
Pin
Mnemonic
Description
Function
S61
S66
CANH6
CANL6
CAN switches
CAN switches
CAN_H
CAN_L
Application Card serial
port - CAN
This port is on the Application Card and can be used by a team’s application, for CAN
operation using team specific code.
56
Pin
Mnemonic
Description
Function
S5
S6
APP-SIA4/CH
APP-SIB4/CL
CAN_H
CAN_L
App Card Serial port RS422 IN/CAN High
App Card Serial port RS422 IN/CAN Low
Application Card serial
port - Spare
This port is on the Application Card and can be used by a team’s application, using team
specific code.
Mnemonic
Description
Function
S1
S2
APP-SOB4RX
APP-SOA4/TX
Spare
Spare
App Serial RS422OUTB/RS232RX
App Serial RS422OUTA/RS232TX
The MCU
Pin
The MCU
57
System communications
In addition to the serial communications ports there are ports which are used for system
communications.
Debug port
The debug port allows communication with the logger card, and the application card if fitted
within the MCU.
PiNet
PiNet is the network which is used to connect the MCU and other units of the Pi Sigma Elite
system. The MCU communicates with the other units via the PiNet port on the MCU.
Debug port
This port has an RS232 serial interface which allows communications with the logger card
and if fitted within the MCU, depending upon the voltage on the mode pin. The voltage on
the mode pin determines which debug mode is selected.
Open circuit is the normal configuration and debug mode is not enabled. Connecting 0V
to the DEMDE pin enables logger card debug mode. Connecting +12V to the DEMDE pin
enables application card debug mode.
The port is defined as:
58
Pin
Mnemonic
Description
Function
L16
L23
L15
DEMDE
DEBRX
DEBTX
Debug mode
Debug to MCU
MCU to debug
The voltage on this pin controls debug mode
RS232 debug receive
RS232 debug transmit
PiNet
Pin
Mnemonic Description
Function
L7
L14
R7
R14
NETAL
NETBL
NETAR
NETBR
PiNet A for lefthand loom
PiNet B for lefthand loom
PiNet A for righthand loom
PiNet B for righthand loom
PiNet A left
PiNet B left
PiNet A right
PiNet B right
It is essential that if you are making your own loom that PiNet is carefully loomed on the
car. The A and B wires for each leg must be twisted and screened, and all connections
must be terminated correctly. You should not use spurs, but link between one unit and the
next until you reach the final unit. The screens must be terminated at the MCU case and
at the case of any slave devices e.g SCU or ACU.
Right way
Wrong way
NETAL
NETBL
NETAL
NETBL
Unit
Unit
Unit
Unit
Connecting units with PiNet
The MCU
59
The MCU
The MCU communicates with other units in the Pi Sigma Elite system using the PiNet
network. In normal configuration the PiNet is terminated in the MCU with a 120 Ohms
resistor.
Communication connectors
Download connector
The download connector on the car provides all of the communication connections from
the System.
washer
download connector
panel cutout
body panel
locknut
from system loom
Ø15.0mm
Ø0.57"
Each time the car returns to the pit or garage area, and you want to download data from
the System, or up-load a setup from your PC, you will need to use this connector.
14.5mm
0.57"
minimum 80.0mm / 3.5"
Fitting the download connector
The download connector is usually fitted in the bodywork area, behind the driver, near the
roll-hoop.
Generally, you should not fit the download connector where it will be exposed to continuous
water spray, dust or mud.
You will need to allow at least an 80mm (3.5 inches) behind the body panel to accommodate
the loom.
60
Connector
Download connector
Mating connector
Sleeve colour
Fischer S 104 A092
Fischer DK 104 A092
green
Note: Some configurations are fitted with an Autosport connector instead of the Fischer
connector. Pin details remain the same.
Fischer download connector pin details
Description
MCU pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Shell
No connection
No connection
No connection
Pit detect/LED*
S54
No connection
No connection
No connection
No connection
ENET-TX–
S34
ENET-TX+
S43
ENET-RX–
S25
ENET-RX+
S17
+12V*
No connection
No connection
No connection
No connection
No connection
No connection
Screen
Function
The MCU
Pin
DO NOT CONNECT
MCU to PC 100BaseT
MCU to PC 100BaseT
PC to MCU 100BaseT
PC to MCU 100BaseT
12V
*Pins 4 and 13 are linked with a 22k ohms resistor in the standard download leads to
maintain functionality with Pi Sigma MCU5 loggers. This function is not required by
the Pi Sigma Elite MCU as connection status is determined by the connection of the
communication lines.
The MCU
61
Download lead
The download lead is used to connect the PCMCIA Ethernet card on the PC to the
download connector on the vehicle.
Two versions of download lead are available. The standard download lead is 5 feet (1.5m)
long and the optional long download lead is 30 feet (10.0m) long. The long lead will enable
the PC to remain in the garage and still connect to the vehicle when it is parked outside.
PC running Pi software
Car
download lead
to System loom
download
connector
PCMCIA
card
Connecting download lead
CAUTION: Certain atmospheric conditions can cause significant static to build up
on a car whilst it is on the circuit. Under these circumstances, to avoid damage to
the PC or to the Pi Sigma Elite MCU, you should ensure that the static charge on
the car is discharged to ground BEFORE connecting the download lead to the car.
62
Download path
connections
The following figure shows the download path connections from MCU on the car to the
PCMCIA Ethernet card connector.
Car
Download lead
MCU
Fischer (or
Autosport)
RJ45
(ENET-TX+) S43
9
9
6
(ENET-TX–) S34
10
10
3
(ENET-RX+) S17
11
11
2
(ENET-RX–) S25
12
12
1
MCU case
The MCU
Fischer (or
Autosport)
Screen
Download path connections
The MCU
63
PC Network
It is possible to download data from the car to a PC which is part of a network. A typical
network is shown in the next figure.
Network hub
Telemetry client
Car server
Car
Telemetry client
Download lead
MCU
A typical network
Note: If you have such a network, it is important that the PCMCIA Ethernet card supplied
by Pi as part of the Pi Sigma Elite System is used in the Car server PC to connect to the
car download lead and is not used to connect to the network hub.
64
Cross over cable
If you do not have a network, you can link two PCs which do not have internal networking
cards by using a standard cross over cable. This allows one PC to be connected as the
car server computer and the second linked PC can then use the downloaded data. The
arrangement is shown in the next figure.
Car
MCU
The MCU
Download lead
Patch cable (crossover)
Two PCs linked using a cross over cable
The MCU
65
66
System expansion
System
expansion
Connecting sensors
The Pi Sigma system sensor connections are based on a 5-pin connector standard. The
standard pinouts for a number of types of sensor are given in the tables below.
5-pin sensor connections
Dual
Diff
Single
RTD
2
SIGA+
SIG+
SIG+
RTD+
SIGGND
1
3
4
5
EXC+
SIGB+
SIGA–
EXC–
EXC+
N/C
SIG–
EXC–
EXC+
N/C
SIGGND
EXC–
N/C
N/C
RTD–
RTD–
EXC+
N/C
I–
EXC–
LVDT
MOOG/
HSD
Dual
digital
(Active)
~SIG+
MOOG+
SIGA+
~EXC+
~SIG–
~EXC–
SIGGND
HSD+
N/C
MOOG–
HSD–
EXC+
SIGB+
N/C
EXC–
System expansion
Pin
Current
loop
5-pin sensor connections (continued)
Pin
Dual
digital
Active
(Passive) digital
Passive
digital
2
SIGA+
SIG+
1
3
4
5
SIG–
EXC+
SIGB+
N/C
N/C
N/C
SIG+
SIG–
EXC–
SIG–
N/C
N/C
N/C
RS422
CAN +
RS232
CAN +
RS422
Out
RS422 In
+ RS232
Debug
SOA
TXD
SOA
TXD
TXD
SIA
SOB
SIB
CANH
RXD
CANL
CANH
SOB
CANL
SIA
RXD
SIB
GNDREF GNDREF GNDREF GNDREF
+12V
RXD
MODE
GNDREF
System expansion
69
Key to 5-pin sensor connections tables
70
Name
Description
Name
Description
CANH
CANL
EXC+
EXC–
GNDREF
HSD+
HSD–
I–
IN A
IN B
MODE
MOOG+
MOOG–
N/C
OUTA
OUTB
CAN link High side
CAN link Low side
Positive supply voltage
Negative supply voltage (0V)
Comms ground reference
High Side Driver positive
High Side Driver negative (0V)
Current sensor input (sink)
RS422 A input
RS422 B input
Debug mode input
Moog Drive positive
Moog Drive negative
No Connection
RS422 A output
RS422 B output
RTD+
RTD–
RXD
SIG+
SIG–
SIGGND
SIGA+
SIGA–
SIGB+
SIGB–
TXD
~EXC+
~EXC–
~SIG+
~SIG–
RTD sensor positive end
RTD sensor negative end
RS232 input
Signal positive input
Signal negative input
Signal ground (0V)
Signal A positive input
Signal B negative input
Signal B positive input
Signal B negative input
RS232 output
AC excitation
AC excitation
AC Signal input
AC Signal input
Connecting sensors to
a Selectronics10V I/O
card
The Selectronics10V I/O card has eight high accuracy analogue input channels, arranged
in four pairs or Groups. These inputs can be configured in software (Pi Workshop) to accept
a wide variety of sensor types.
Each Group has one excitation voltage commoned to both channels. Two of the groups
have grounds for high power use and the other two groups have grounds for low power
use.
The following tables summarise the input functions of each channel in the groups.
Selectronic10V I/O card input functions
Input Excite Excite option
1A
1B
Type
Mode
Gain
ADC ref Special
Bipolar or 0–640 Bipolar or
EXC1 0.5A unregulated BATT Differential
Unipolar 0–8 Unipolar
OR
5.0–11.0V regulated
EXC1 0.5A unregulated BATT Single ended Unipolar 0–8 Unipolar
OR
5.0–11.0V regulated
Absolute None
None
Inputs 2A and 2B
Type
Mode
2A
EXC2 5.0–11.5V regulated Differential
2B
EXC2 5.0–11.5V regulated Single ended Unipolar
only
Gain
ADC ref
Special
Bipolar or 0–640 Bipolar or Absolute/ RTD
Ratiometric
0–8 Unipolar
System expansion
RTD
71
System expansion
Inputs 1A and 1B
Inputs 3A and 3B
Type
Mode
Gain
ADC ref
Special
3A
None
Absolute/
Ratiometric
3B
Unipolar
0–8 Unipolar
Absolute/
Current
Ratiometric (0 to 20mA)
Mode
ADC ref
Inputs 4A and 4B
Type
Gain
4A
4B
Special
None
Absolute/
Ratiometric
Current
(0 to 20mA)
Explanation of Selectronic10V I/O card input function table headings
Explanation of the headings in the Selectronic I/O card input functions tables are given
below.
Input
The name of the channel. In Pi Workshop Software it will appear in the following format:
Input1A.02.03.16
where:
Input1A refers to the channel
.02 refers to the Node (02 is the MCU, 05 is the SCU3)
.03 refers to the Card number (0-5 where 0 is always the digital I/O
card)
.16 is a unique number assigned by Pi Workshop PC Software
72
Excite
The Excite output associated with that Group. This is loom dependant but normally EXC1
is for Group 1, EXC2 is for Group 2 and so on.
Excite options
The programmable voltages work from 5V to 12.5V, 100mA maximum.
The EXC outputs are rated for a 120 ohms load. i.e. 100mA at 12V or 40mA at 5V.
Note: EXC1 has a 500mA unregulated option.
Generally, only low current sensors should be used with single ended inputs. These types
of input are suited to temperature or pressure sensor where absolute accuracy is not
imperative.
Mode
There are two selectable modes:
nn
nn
Unipolar means that the input can only measure positive signals
(0V to ±10V).
Bipolar means that the input can measure both positive and negative signals
(±10V).
Gain
The gain available depends upon the mode of an input.
nn
nn
Unipolar channels can be programmed by the user to have a gain from
0 to 8.
Bipolar channels can be programmed by the user to have a gain from
0 to 640.
You can mix and match gains with two exceptions:
nn
nn
If one of the channels in a Group has unity gain then the other channel in the
group must also have unity gain
For inputs 1A and 2A they must both be either unipolar or bipolar. Changing
one automatically changes the other.
System expansion
73
System expansion
Type
nn Differential means that there is a signal –ve and a signal +ve.
nn Single ended means that the signal –ve is grounded on the card.
ADC ref
There are two types of sensor available, Absolute and Ratiometric.
nn
nn
Absolute sensors are usually active sensors, such as accelerometers, which
have an internal voltage reference or regulator and are unaffected by drift in
the excitation voltage.
Ratiometric sensors, such as potentiometers or strain gauges, are affected
by the excitation voltage. If you double the excitation voltage, you double the
signal voltage.
In ratiometric mode the Selectronics I/O card monitors the excitation voltage and
compensates for any drift. This is useful for strain gauges where the gains are high, and
where the excitation voltage can be increased (e.g. from 5V to 7V) to give more output.
In ratiometric mode the calibration is unchanged even when the excitation is increased. This
means that you can decrease the gain and improve the signal to noise ratio.
Special
Some inputs can accommodate special sensors e.g. RTDs and Current output type of
sensor. Selecting Current operation limits the possible configurations of a Group. If inputs
3B or 4B are set to current input, then inputs 3A or 4A must be bipolar. Ratiometric mode
is not available.
74
Sensor wiring information
Wiring information for some types of sensors is given in the following figures.
Connecting a single
ended sensor to a
single ended input
Group 1 Input 1B and Group 2 Input 2B are single ended inputs.
5-pin
connectors
Sensor
+
–
EXC
1
SIG+
2
GND*
5
System expansion
I/O card
*GND connection can use low current (100mA) signal grounds GND1 or GND2
or high current (500mA) GNDA or GNDB as appropriate
Connecting a potentiometer to a single ended input
System expansion
75
Connecting a single
ended sensor to a
differential ended input
Group 1 Input 1A, Group 2 Input 2A, Group 3 Input 3A and Input 3B, Group 4 Input 4A and
Input 4B are differential inputs.
5-pin
connectors
I/O card
+
–
Sensor
EXC
1
SIG+
2
SIG–
4
GND*
5
Connecting a single ended sensor to a single ended input
76
Connecting a strain
gauge to a differential
input
Strain gauges can only be connected to differential inputs (Group 1 Input 1A, Group 2 Input
2A, Group 3 Input 3A and Input 3B Group 4 Input 4A and Input 4B).
5-pin
connectors
+
–
EXC
1
SIG+
2
SIG–
4
GND*
5
Sensor
System expansion
I/O card
Connecting a strain gauge to a differential input
System expansion
77
Connecting an RTD
RTD sensors can only be connected to Group 2 Input 2A and Input 2B. The pull-up resistor
(value 5k ohms) is enabled when RTD is selected as an input type in Pi Workshop.
5-pin
connectors
I/O card
Sensor
EXC
5k
+
–
SIG+
2
SIG–
4
GND*
5
Connecting an RTD
78
Connecting a current
output sensor
Current output sensors can only be connected to Group 3, Input 3B and Group 4,
Input 4B.
5-pin
connectors
I/O card
+
–
EXC
1
SIG+
2
SIG–
4
GND*
5
Sensor
Current
output
sensor
100R
System expansion
Connecting a current output sensor
Note: You can connect a single ended sensor to Group 3 and Group 4 without an
external ground strap if you turn on the current sense option in Pi Workshop, which
enables the sense 100R resistor between SIG– and Ground.
System expansion
79
Connecting a voltage
output sensor to a
single ended input
Connect 0–5V output sensors (e.g. pressure sensors) to Group 1 Input 1B and Group 2
Inpu 2B which are single ended inputs.
5-pin
connectors
I/O card
Sensor
+
–
EXC
1
SIG+
2
GND*
5
Active
sensor
Connecting a 0–5V voltage output sensor to a single ended input
80
Connecting a voltage
output sensor to a
differential ended input
Group 1 Input 1A, Group 2 Input 2A, Group 3 Input 3A and Input 3B, Group 4 Input 4A an
Input 4B are differential inputs.
5-pin
connectors
Sensor
+
–
EXC
1
SIG+
2
SIG–
4
GND*
5
Active
sensor
System expansion
I/O card
Connecting a 0–5V voltage output sensor to a differential ended input
System expansion
81
Miscellaneous connections
Octal passive junction
box dimensions
0.17"(4.50)
0.94"(24.0)
Use the following diagram to help youfit an Octal passive junction box.
1A
1B
2A
2B
3A
3B
4A
4B
1.06"(27.0)
6.63"(166.0)
0.09"(2.40)
M4 x 6.0
4 positions
0.09"(2.40)
0.75"
(19.2)
6.35"(161.2)
Octal passive junction box dimensions (in inches and millimetres)
82
Octal passive junction
box connections
The cost option Octal passive junction box can be used to connect inputs from several
sensors and is compatible with a range of I/O cards.
The Octal passive junction box provides connection for 6 differential inputs and 2 single
ended inputs making it compatible with a Selectronics I/O card.
The Octal passive junction box can be used with an LVDT I/O card.
The Octal passive junction box can be used with thermocouple sensors. Up to 7
thermocouple sensor inputs and a temperature reference cn be connected to the junction
box.
1B
2A
2B
3A
3B
4A
4B
System expansion
1A
Octal passive junction box (OPJB) - position of connectors
Octal passive junction box connectors
Description
OPJB Connector
Flying lead connector
Connectors 1A to 4B
AS612-35PN
AS106-05SN-HE
AS112-35SN
AS606-05PN-HE
System expansion
83
Connection details
The following tables detail the connections on OPJB. The tables are for a standard
Pi Sigma Elite configuration and assume that the connections are to a Selectronics
I/O card. For connections to other I/O cards refer to the Octal connector column in the
relevant table in the section I/O Cards.
The Octal column in the following tables refers to the pin number on the flying lead
22-pin ‘Octal’ connectors on the System loom.
Input connector 1A
Octal Input pin Group
Mnemonic
Signal description
6
7
8
18
4
EXC1
SIG1A+
SIG1B+
SIG1A–
GNDB
Programmable excitation
Differential analog input +
Differential analog input –
Signal ground
Octal Input pin Group
Mnemonic
Signal description
6
8
–
–
9
EXC1
SIG1B+
–
–
GND1
Single ended analog input +
No connection
No connection
Signal ground
1
2
3
4
5
1A
1B
1D
1C
GNDB
Input connector 1B
84
1
2
3
4
5
1A
1D
–
–
1E
Input connector 2A
Octal Input pin
Group Mnemonic
Signal description
13
14
1
22
11
2A
2B
2D
2C
GNDA
Programmable excitation 100mA
Differential analog input + or RTD input
Single ended analog input + or RTD input
Signal ground
1
2
3
4
5
EXC2
SIG2A+/R
SIG2B+/R
SIG2A
GNDA
Octal Input pin
Group Mnemonic
Signal description
13
1
N/C
N/C
2
2A
2D
–
–
2E
No connection
No connection
Signal ground
1
2
3
4
5
EXC2
SIG2B+/R
–
–
GND2
System expansion
Input connector 2B
Input connector 3A
Octal Input pin
Group Mnemonic
Signal description
3
15
17
16
4
3A
3B
3D
3C
GNDB
Signal ground
1
2
3
4
5
EXC3
SIG3A+
SIG3B+
SIG3A–
GNDB
System expansion
85
Input connector 3B
Octal Input pin
Group Mnemonic
Signal description
3
17
N/C
5
9
3A
3D
–
3E
1E
Temperature compensation signal
Differential analog input – or current input
Signal ground
1
2
3
4
5
EXC3
SIG3B+
TSIG
SIG3B–/I
GND1
Input connector 4A
Octal Input pin
Group Mnemonic
Signal description
12
21
19
20
11
4A
4B
4D
4C
GNDA
Signal ground
1
2
3
4
5
EXC4
SIG4A+
SIG4B+
SIG4A–
GNDA
Input connector 4B
86
Octal Input pin
Group Mnemonic
Signal description
12
19
N/C
10
2
4A
4D
–
4E
2E
No connection
Differential analog input – or current input
Signal ground
1
2
3
4
5
EXC4
SIG4B+
–
SIG4B–/I
GND2
Tyre Performance
System (TPS)
connections
The connection details below are for the Tyre Performance System (TPS) which is a cost
option to the standard Pi Sigma Elite system.
Connector details
Loom connector
TPS unit connector
AS610-35-SN
AS210-35-PN
MCU pin
TPS pin
Mnemonic
Signal description
S15
S16
–
S65
–
–
–
–
–
–
–
–
–
1
2
3
4
5
6
7
8
9
10
11
12
13
FBAT1–
FBAT1+
–
RX5
–
–
–
–
–
–
–
–
–
TPS power 0V
TPS power + 7–18V
TPS RS422 A
TPS to MCU RS232 serial data
Signal 0V
Pi use
Pi use
FL analogue signal 0–5V
FR analogue signal 0–5V
RL analogue signal 0–5V
Pi use
Pi use
RR analogue signal 0–5V
System expansion
System expansion
Connector pin information
87
Telemetry connections
The connection details below are for the Pi P192S telemetry system, which is a cost option
to the standard Pi Sigma Elite system.
Connector details
Loom connector
Radio connector
AS612-35SA
AS212-35PA
Connector pin information
MCU pin
Telemetry pin Mnemonic
Signal description
–
S64
–
–
–
S60
–
–
–
–
–
–
–
–
–
–
–
–
1
2
3
4
5
6
7
8
9–10
11
12
13
14–15
16
17–19
20
21
22
Temp. sig +ve
RS232 from radio
Not used
RS422 from radio +ve
RS422 from radio –ve
RS232 to radio
RS422 to radio +ve
RS422 to radio –ve
Not used
Power –ve
Power +ve
Power +ve
Not used
Radio control1
Not used
Power –ve
Temp. sig–ve
Not used
–
S0B2/RX
–
–
–
SOA2/TX
–
–
–
–
–
–
–
–
–
–
–
–
Pin 16 Radio control: apply +ve volts for radio ON. No connection puts radio into
stand-by.
1
88
Dash connectors
The Pi Sigma Elite system can use a Pi Compact dash, Pi Steering wheel dash or Pi
Omega dash to display information. The Compact dash can drive a number of satellite
display modules. Dashes are connected to the MCU via the main loom and a number of
smaller looms. Both types of dash require two remote switches (left and right) to control
them. When used with the compact dash the remote switches require a Switches to CAN
interface box.
The figure below shows the method of connection a Compact dash and satellite modules
to the System.
Compact dash
System loom–
Dash and
switches
connector
Satellite
modules
Dash and
switches
Y- loom
Switches to
CAN box
Switch loom
Left and right
switches
Connecting a Compact dash to the System
Compact dash connector information
Description
Loom connector
Dash or box
connector
Compact dash
Switches to CAN interface box
Dash and switches y-loom
AS106-05SN-HE
AS206-05SN-HE
AS206-05SB-HE
AS606-05PN-HE
AS606-05PN-HE
AS606-5PB-HE
System expansion
89
System expansion
Compact dash
connections
Dash and switches y-loom detail
Compact dash
connector
Dash and switches
Y- loom
Loom CAN
connector
Left andright
switches
Switches to
CAN box
Switches
connector
Dash and switches y-loom detail
Dash and switches y-loom dash connector
MCU pin
Dash Pin
Mnemonic
Signal description
–
S40
S57
–
–
1
2
3
4
5
–
SOA4/TX
SOB4/RX
BATT–
BATT+
No connection
MCU to dash data
Dash to MCU data
Battery –ve
12V battery +ve
Switches to CAN box - CAN connector
90
MCU pin
Pin
Mnemonic
Function
S61
–
–
S66
–
1
2
3
4
5
CANH6
No connection
BATT+
CANL6
BATT–
Dash switch CAN High
–
12V battery +ve
Dash switch CAN Low
Battery –ve
Switches to CAN box - switches connector
Function
1
2
3
4
5
Left switch up
Left switch down
Right switch up
Right switch down
Ground
System expansion
Pin
System expansion
91
Steering wheel dash
connections
The steering wheel dash can be connected to the System as shown in the figure below. The
left and right switches are wired onto the loom which is terminated with a 19-pin connector,
which plugs into the rear of the Steering wheel dash.
Steering wheel dash
System loom – Dash and
switches connector
Left switch
Steering column
Right switch
Connecting a Steering wheel dash via the steering column
Steering wheel dash connector information
Description
Loom connector
19-pin connector
Steering wheel dash AS connector
AS608-35SN
Mating connector
AS108-35PN
Steering wheel dash loom connector details
AS608-35SN connector
92
MCU pin
Pin
Wire color
Mnemonic
Signal description
–
–
S61
S66
S40
S57
1
2
3
4
5
6
Shell
Black
Red
Yellow
Green
Brown
Orange
Screen
BATT–
BATT+
CANH6
CANL6
SOA4/TX
SOB4/RX
Battery –ve
Battery +ve
Dash switch CAN High
Dash switch CAN Low
MCU to dash data
Dash to MCU data
Pin
Function
Pin
Function
1
2
3
4
5
6
7
8
9
10
Ground (black)
RS422A (brown)
Power (red)
RS422B (orange)
CAN_H (yellow)
CAN_L (green)
Right switch down (blue)
Right switch up (violet)
Left switch down (grey)
Left switch up (white)
11
12
13
14
15
16
17
18
19
Switch ground (white/black)
MRC ground (white/brown)
MRC data (white/red)
SW 1 down (white/orange)
SW 1 up (white/yellow)
SW 2 down (white/green)
SW 2 up (white/blue)
SW 3 down (white/violet)
SW 3 up (white/grey)
Pins 14 to 19 allow additional switches to be connected to the CAN interface which is
contained within the steering wheel dash.
Right switch connections
Pin
Function
Wire color
1
2
3
Ground
Switch up
Switch down
Black
Violet
Blue
Left switch connections
Pin
Function
Wire color
1
2
3
Ground
Switch up
Switch down
Black
White
Grey
System expansion
93
System expansion
Steering wheel dash 19-pin connector details
Omega dash
connections
The Omega dash can be connected to the System as shown in the figure below. The dash
connects directly to the System loom via the System connector (PA) on the rear of the dash.
The remote driver switch and Omega LED module connect to the Switch/LED connector
(waterproof 15D socket).
System loom – Omega dash and
switches connector
Omega LED module
Omega dash
ALARM
OIL
PS
FUEL
BAR
LAP
Research
KPH
MPH
V
LA P
OIL
WAT
oF
oC
Remote driver switch
Connecting an Omega dash
Omega dash connector information
Description
Loom connector
37-pin connector
Omega dash AS connector
AS214-35PA
Mating connector
AS614-35SA
Omega dash 37-pin connector details
Pin
Function
Pin
Function
1
2
3
4
Battery –ve
Battery +ve
CAN1 Hi
Serial 1 Rx
19
20
21
31
CAN2 Hi
CAN1 Lo
Serial 2 Tx
CAN2 Lo
All other pins are not connected.
94
Switch / LEDs connections
Pin
Name
Note
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LED1
LED2
LED3
LED4
Alarm
SETUPB1
SETUPB2
DRIVERB1 Gnd
LED5
LED6
LED7
LED power
SETUPB3
SETUPB4
DRIVERB1
120R series resistor
Setup Button 1
Setup Button 2
System expansion
PWM brightness control
Setup Button 3
Setup Button 4
Remote driver switch signal
System expansion
95
System expansion
System expansion
96
The SCU3
The SCU3
Introduction
The SCU3 is used to expand a Pi Sigma System installation. The standard SCU3 is fitted with
three Selectronic I/O cards, but these can be replaced by other I/O at the time of order or by
returning the SCU3 to Pi Research. Information on the I/O cards available is given in section
Input/Output (I/O) cards.
SCU3 specifications
Operating specifications:
The standard SCU3 has the following operating specifications:
nn
nn
nn
nn
nn
Three Selectronic I/O cards, giving 24 analog channels
Four digital channels (each channel can be input or output)
Serial port RS422 bidirectional (at the same baud rate for input and output)
Technical specifications
Description
Value
Input Voltage Range
Supply current
Operating Temperature Range
Storage Temperature Range
Environmental
Weight
+9.0V to +18V
0.6A at 13.8V
0°C to +60°C
–40°C to +120°C
IP65
1.0 lb (452 grams) with 3 Selectronic I/O cards fitted
The SCU3
The SCU3
The SCU3 has the following technical specifications:
99
SCU3 internal analog
debug channels
The SCU3 has a set of internal analog debug channels which monitor the health of the unit.
To view the channels they must be included in the logging table of the unit. The maximum rate
that they can be logged at is 100Hz, but to conserve logging memory they should be logged
at 10Hz or below.
The most important channels to log are the Box battery voltage and Box temperature. Include
the other channels if you can. The SCU3 internal analog debug channel names are given in
the next table.
SCU3 internal analog debug channel names
100
Channel
Pi software name
SCU3 Reference voltage (2.5V) PSU temperature
Battery backup voltage (3.0V – 3.6V)
Box temperature on Nose card
Left battery voltage
Right battery voltage
Power supply +5V
Power Supply +12V Power supply –12V
Box battery voltage (9V–18V)
Box battery input current
Programming Voltage
ADC Ref.05.00.56
PSU Temp.05.00.57
Backup BattV.05.00.47
Temp.05.00.03
Batt Volt (Left).05.00.62
Batt Volt (Right).05.00.
+5 Volts.05.00.50
+12 Volts.05.00.51
–12 Volts.05.00.52
Voltage.05.00.02
Supply Current.05.00.54
Vpp Feedback.05.00.46
SCU3 dimensions
Use the following diagram to help you fit an SCU3.
3.78"(96.00)
3.00"(76.00)
M4 x 10mm
4 positions
The SCU3
4.33" (110.00)
0.39"
(10.00)
0.60"
(15.00)
0.70"
(18.00)
4.52"(115.00)
5.00"(127.00)
5.70"(145.00)
1.65"(42.00)
2.75"(70.00)
0.83"
(21.00)
1.33"
(34.00)
SCU3 view looking into bottom of unit (dimensions in inches and millimetres)
The SCU3
101
the SCU3
When fitting the SCU you should consider the following points:
nn
nn
nn
nn
The SCU is resistant to water, but after prolonged exposure, water, oil and fuel
may eventually work their way inside the SCU. Select a position where the units
will not be in constant contact with any fluid.
The SCU must be protected from vibration. Use the anti-vibration mounts.
Make sure that air can flow over the SCU to keep it below +60°C.
Try not to place the SCU near sources of electrical interference e.g. ignition coils,
plug leads, ECUs, alternators and telemetry antenna.
Fitting an SCU
1 Select a suitable location for the unit.
Make sure that the location does not exceed 60°C. Hot weather and localised heating effects
will add to the ambient air temperature.
2
Use the mounting lugs and AV mounts supplied to secure the SCU.
CAUTION: The SCU3 case acts as a heatsink for internal electronic components. It is
important that air can flow around all sides of the SCU3.
3
When you have fitted the unit, make sure that air can flow all around it.
Connecting the SCU3
Four pins connect the SCU3 to your vehicle’s battery star points. Two pins are on the lefthand
55–way and two pins are on the righthand 55–way connector. These battery connections
provide all of the power to the SCU3 and are listed in the table below.
SCU3 battery connections
102
Pin
Connection
Function
L1
L9
R1
R9
Battery +ve
Battery –ve
Battery +ve
Battery –ve
Pins L1 and R1 are cross-coupled inside the SCU3, using diodes. Pins L9 and R9 are
commoned inside the SCU3. These arrangements ensure that the SCU3 functions if one of
the battery supply lines breaks. The input is protected against reversed battery connections,
and transients of ±40 volts.
The internal connections are represented in the next figure.
55-way connectors
on SCU3
5 amps
5 amps
5 amps
5 amps
L1
R1
L9
SCU3
circuits
Supply for
sensors
5 amps
R9
Representation of internal SCU3 battery connections
When you install the SCU, use the figure below as a guide. If your vehicle has a master switch
configuration, refer also to the figure in section Connecting systems.
Heavy gauge wire or braid
22-gauge twisted together
L9 (MCU) and L1 (SCU3)
The SCU3
L24 (MCU and R1 (SCU3)
star point
R9(MCU) and L9 (SCU3)
R24 (MCU) and R9(SCU3)
battery
chassis
Battery connections (showing pin numbers for the MCU and the SCU)
The SCU3
103
SCU3 connectors
This section gives information on the connectors used on the SCU3 and the pin out details for
each connector. The figure below shows the position of the connectors on the SCU3.
Lefthand 55-way
(yellow ring)
Righthand 55-way
(red ring)
SCU3 connectors
SCU3 connector details
The SCU3 is fitted with two 55-way Deutsch Autosport connectors.
SCU3 Deutsch Autosport connectors
104
Description
MCU Connector
SCU3 Lefthand 55-way
SCU3 Righthand 55-way
AS216-35PA
AS216-35PN
AS616-35SA
AS616-35SN
SCU3 Lefthand 55-way
connector
Mnemonic
BAT+
NETBL**
SCN
C2-GNDA*
C2-GNDB*
NETAL**
NETBL**
NETAL**
BAT–
C2-1A
C2-1A
C2-1B
ADDR1
IO1A
D-GNDA*
D-GNDB*
C2-1E
C2-1E
C2-1D
C2-1C
C2-3B
IO1B
EXC1
GND1
C2-3A
C2-3C
C2-3D
C2-4B
Signal description
Battery power +ve
PiNET B left
Loom screen to case
Card2 signal ground
Card2 signal ground
PiNET A left
PiNET B left
PiNET A left
Battery power –ve
Card2 group 1 signal A
Card2 group 1 signal B
Junction box1 address
Digital I/O 1A
Digital signal ground
Digital signal ground
Card2 group 1 signal E
Card2 group 1 signal D
Card2 group 1 signal C
Digital I/O 1B
Digital group 1 excitation
Digital group 1 GND
Pin
L29
L30
L31
L32
L33
L34
L35
L36
L37
L38
L39
L40
L41
L42
L43
L44
L45
L46
L47
L48
L49
L50
L51
L52
L53
L54
L55
Mnemonic
C2-4C
DEMDE
N/C
C2-3E
C2-4A
C2-4D
C2-2C
SOA4/TX
SIB4/CL
DEBTX
EXC2
C2-4E
C2-2B
C2-2D
ADDR0
SOB4/RX
DEBRX
SIA4/CH
C2-2A
C2-2A
C2-2E
IO2B
IO2A
A-GND
C2-2E
GND2
EXC2
Signal description
Debug mode
No connection
SCU to RS422A/RS232
CAN_L/RS422B to SCU
SCU to Debug
Junction box address 0
SCU to RS422B/RS232
Debug to SCU
CAN_H/RS422A
Digital I/O 2B
Digital I/O 2A
Junction box addr ground
Digital group 2 ground
The SCU3
Pin
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L27
L28
** Route in Left hand loom
The Signal function is determined by the type of I/O cards fitted in the SCU3.
The SCU3
105
SCU3 Righthand 55-way
connector
Pin
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R1 7
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
Mnemonic
BAT+
NETBR
SCN
C1-GNDA
C1-GNDB
NETAR
NETBR
NETAR
BATC1-1A
C1-1A
C1-1B
C3-1C
C3-1B
C3-GNDA
C3-GNDB
C1-1E
C1-1E
C1-1D
C1-1C
C1-3B
C3-1D
C3-1A
C3-1E
C1-3A
C1-3C
C1-3D
C1-4B
Signal description
Battery power +ve
PiNET B right• •
Connect loom to case
Card 1 signal ground
Card 1 signal ground
PiNET A right• •
PiNET B right• •
PiNET A right• •
Battery power –ve
Card3 signal ground*
Card3 signal ground*
Pin
R29
R3 0
R3 1
R32
R33
R34
R35
R36
R37
R38
R39
R40
R41
R42
R43
R44
R45
R46
R47
R48
R4 9
R50
R51
R5 2
R53
R54
R55
Mn emonic
C 1-4C
C3-3C
C3-3A
C1-3E
C1-4A
C1-4D
C1-2C
C3-4B
C3-4C
C3-3B
C3-3E
C1-4E
C1-2B
C1-2D
C3-2C
C3-4D
C3-3D
C3-4A
C1-2A
C1-2A
C1-2E
C3-2D
C3-2B
C3-4E
C1-2E
C3-2E
C3-2A
Signal description
** Route in Right hand loom
The Signal function is determined by the type of I/O cards fitted in the SCU3.
106
SCU3 connections
The SCU3 has a number of digital, system and serial port connections which are described
in this section.
SCU3 Digital Group 1
SCU3 Digital Group 1 channels (1A and 1B) are input and output. SCU3 Group 1 digital
inputs have programmable slice levels, programmable hysteresis, programmable pre-scalar,
programmable 125kHz–1MHz clock, fixed 10k Ohm pull-up, 0–5V or 0–15V input range,
switchable 10kHz/2kHz input filter and programmable 2.5V–12.5V excitation voltage. The Pi
Workshop PC Software includes a calculator which helps to ensure that the settings for these
digital channels are optimized.
Normally used for
L23
L14
L22
L24
User defined
User defined
Ground for SCU3 Group 1 signals
EXC1
IO1A
IO1B
GND1
SCU3 digital group 1 excitation
SCU3 digital input 1A
SCU3 digital input 1B
SCU3 digital group 1 ground
The SCU3
Pin number refers to the Lefthand 55-way connector on the SCU3.
The SCU3
107
SCU3 Digital Group 2
SCU3 Digital Group 2 channels (2A and 2B) are input and output. SCU3 Group 2 digital
inputs have programmable slice levels, programmable hysteresis, programmable pre-scalar,
programmable 125kHz–1MHz clock, fixed 10k Ohm pull-up, 0–5V or 0–15V input range,
switchable 10kHz/2kHz input filter and programmable 2.5V–12.5V excitation voltage. The Pi
Workshop PC Software includes a calculator which helps to ensure that the settings for these
digital channels are optimized.
Normally used for
L39
L51
L50
L54
User defined
User defined
Ground for SCU3 Group 2 signals
EXC2
IO2A
IO2B
GND2
SCU3 digital group 2 excitation
SCU3 digital input 2A
SCU3 digital input 2B
SCU3 digital group 2 ground
Pin number refers to the Lefthand 55-way connector on the SCU3.
108
SCU3 system connections
The SCU3 has a number of System connections, which are listed in the next table.
Pin
Mnemonic
Description
Comment
R9
R24
L9
L24
R7
R14
L7
L14
RBAT+
RBAT–
LBAT+
LBAT–
NETAR
NETBR
NETAL
NETBL
Battery +ve
Battery –ve
Battery +ve
Battery –ve
PiNet A right
PiNet B right
PiNet A left
PiNet B left
Right battery +ve
Right battery –ve
Left battery +ve
Left battery –ve
Route in righthand loom. Twist with PiNet B right
Route in righthand loom. Twist with PiNet A right
Route in lefthand loom. Twist with PiNet B left
Route in lefthand loom. Twist with PiNet A left
The SCU3
Pin numbers refer to the 55-way connectors on the SCU3.
The SCU3
109
SCU3 Selectronic card
connections
Group Mnemonic I/O
Signal description
Card 1
Card 2
Card 3
Octal
connector
1A
EXC1A
Output
Prog. Excitation, regulated,
minimum load 120R,
OR 0.5A high power unregulated
R10&R11
L11&L10
R23
Pin 6
1B
SIG1A+
Input
R12
L12
R14
Pin 7
1C
SIG1A–
Input
R20
L20
R13
Pin 18
1D
SIG1B+
Input
R19
L19
R22
Pin 8
1E
GND1
–
Signal ground
R17&R18
L17&L18
R24
Pin 9
2A
EXC2 A
Output
minimum load 120R
R47&R48
L48&L47
R55
Pin 13
2B
SG2A+/R
Input
Differential analog input+ / RTD
R41
L41
R51
Pin 14
2C
SIG2A–
Input
R35
L35
R43
Pin 22
2D
SG2B+/R
Input
Single ended analog input+ / RTD
R42
L42
R50
Pin 1
2E
GND2
–
Signal ground
R49&R53
L49&L53
R54
Pin 2
3A
EXC3A
Output
minimum load 120R
R25
L25
R31
Pin 3
3B
SIG3A+
Input
R21
L21
R38
Pin 15
3C
SIG3A–
Input
R26
L26
R30
Pin 16
3D
SIG3B+
Input
R27
L27
R45
Pin 17
3E
SG3B–/I
Input
Differential analog input– / current input R32
L32
R39
Pin 5
4A
EXC4A
Output
minimum load 120R
R33
L33
R46
Pin 12
4B
SIG4A+
Input
R28
L28
R36
Pin 21
4C
SIG4A–
Input
R29
L29
R37
Pin 20
4D
SIG4B+
Input
R34
L34
R44
Pin 19
4E
SG4B–/I
Input
Differential analog input– / current input R40
L40
R52
Pin 10
GNDA
Signal ground
R4
L4
R15
Pin 11
GNDB
Signal ground
R5
L5
R16
Pin 4
110
SCU3 LVDT card
connections
1A
1B
1C
1D
1E
2A
2B
2C
2D
2E
3A
3B
EX1A+/5H
SIG1A
EXC1A–
SIG1B
EX5–/G
EX2A+/5
SIG2A
EXC2A–
SIG2B
EX5+/5G
EX3A+/5
SIG3A
Input
Output
Input
Output
Output
Input
Output
Input
Output
Output
Input
LVDT 1A Prog. AC Excitation + / +5V /
HSD1
LVDT 1A Signal Input + / Input 1A
LVDT 1A Prog. AC Excitation –
Card 1
R10&R11
R12
R20
LVDT 1A Signal Input – / Input 1B
R19
LVDT 2A Prog. AC Excitation + / +5V
R47&R48
LVDT 5A Prog. AC Excitation – / Ground R17&R18
LVDT 5A Prog. AC Excitation + /
+5V / Ground
R41
R35
R42
R49&R53
R25
R21
Card 2
L11&L10
L12
L20
L19
L17&L18
L48&L47
L41
L35
L42
L49&L53
L25
L21
Card 3
R23
R14
R13
Pin 13
R51
R43
R50
R54
R31
Pin 1
Pin 2
Pin 3
R45
Pin 17
L26
R30
3E
SG5+/HA
Input
LVDT 5A Signal Input + / HSD5A
R32
L32
R39
L27
Pin 14
Pin 22
Pin 15
R26
R27
Pin 9
R38
Pin 7
Pin 18
R55
Output
Input
Pin 6
Pin 8
EXC3A–
SIG3B
Octal
connector
R22
R24
3C
3D
Pin 16
Pin 5
4A
EX4A+/5
Output
R33
L33
R46
Pin 12
4C
EXC4A–
Output
R29
L29
R37
Pin 20
4E
SG5–/HB
Input
LVDT 5A Signal Input – / HSD5B
R40
L40
R52
4B
4D
SIG4A
SIG4B
GNDA
GNDB
Output
Signal description
Input
Input
Signal ground
Signal ground
R28
R34
R4
R5
L28
L34
L4
L5
R36
R44
R15
R16
Pin 21
The SCU3
Group Mnemonic I/O
Pin 19
Pin 10
Pin 11
Pin 4
The SCU3
111
SCU3 Moog/LVDT card
connections
Group Mnemonic I/O
1A
EX1A+/5H
Output
Signal description
Card 1
Card 2
Card 3
Octal
connector
1B
SIG1A
Input
R12
L12
R14
Pin 7
1D
SIG1B
2A
EX2A+/5
1C
1E
2B
2C
2D
2E
3A
3B
3C
3D
3E
4A
4B
4C
4D
4E
EXC1A–
EX5–/G
SIG2A
EXC2A–
SIG2B
EX5+/5G
EX3A+/5
SIG3A
EXC3A–
SIG3B
SG5+/HA
EX4A+/5
SIG4A
EXC4A–
SIG4B
SG5–/HB
GNDA
GNDB
112
LVDT 1A Prog. AC Excitation + / +5V /
0.3Amp HSD1
R10&R11
L11&L10
R23
Pin 6
Output
R20
L20
R13
Pin 18
Output
Current / Voltage Output 5 –
R17&R18
L17&L18
R24
Pin 9
Input
R41
L41
R51
Pin 14
Input
Output
Output
Input
Output
Output
Input
High Side 1Amp Unregulated
R19
R47&R48
R35
R42
R49&R53
R25
R21
L19
L48&L47
L35
L42
L49&L53
L25
L21
R22
R55
R43
R50
R54
R31
R38
Pin 8
Pin 13
Pin 22
Pin 1
Pin 2
Pin 3
Pin 15
Output
LVDT 3A Prog AC Excitation –
R26
L26
R30
Pin 16
I/O
Output 5 / Sense / Ground
R32
L32
R39
Pin 5
Input
Output
Input
Output
Input
I/O
High Side 1Amp Unregulated
Output 4A / Sense / Ground
Current / Voltage Output 4A –
Output 4B / Sense / Ground
Current / Voltage Output 4B –
Signal ground
Signal ground
R27
R33
R28
R29
R34
R40
R4
R5
L27
L33
L28
L29
L34
L40
L4
L5
R45
R46
R36
R37
R44
R52
R15
R16
Pin 17
Pin 12
Pin 21
Pin 20
Pin 19
Pin 10
Pin 11
Pin 4
SCU3 Pressure scanner
card connections
Group Mnemonic I/O
Signal description
Card 1
Card 2
Card 3
Octal
connector
1B
Multiplex Select Address 1
R12
L12
R14
Pin 7
AD0
Output
1C
AD2
Output
1D
1E
2A
2B
AD1
AD3
AD4
AD5/H3
GSNSE3
Output
Output
Output
R24
R55
Pin 1
Input
Input
Input
Input
Output
Not supported
Remote Ground Sense
Pressure Scanner 0
R35
R49&R53
L35
L49&L53
R43
R54
L25
R31
Pin 3
Not supported
R26
L26
R30
Pin 16
Not supported
No connection
HSD1 – Not supported
R21
R27
R32
R33
L21
L27
L32
L33
R38
R45
R39
Pin 20
L28
R36
4D
SIG1
Input
Not supported
R34
L34
R44
SIG0
GNDA
GNDB
Input
Signal Input
Pressure Scanner 0
Signal ground
Signal ground
R40
R4
R5
L29
L40
L4
L5
Pin 5
R37
R28
R29
Pin 17
Pin 12
Not supported
Not supported
Pin 15
R46
Input
4E
Pin 2
R25
Not supported
SIG3
Input
Pin 22
No connection
4B
SIG2
Pin 13
R50
SENS2
4C
Pin 9
L42
3C
HSD1
L48&L47
R42
Input
SENS0
L17&L18
Pin 8
Not supported
AD6/H2
4A
R47&R48
Pin 18
Input
3A
3E
R17&R18
R22
Pin 14
Input
SENS1
Multiplex Select Address 5/
HSD 3 – not supported
L19
R13
Pin 6
R51
GSNSE0
3D
R19
L20
R23
L41
2E
SENS3
R20
L11&L10
R41
Input
3B
R10&R11
Not supported
GSNSE2
GSNSE1
Input
2C
2D
Output
R52
R15
R16
Pin 21
The SCU3
1A
Pin 19
Pin 10
Pin 11
Pin 4
The SCU3
113
SCU3 CAN card
connections
Group Mnemonic I/O
Signal description
Card 1
Card 2
Card 3
Octal
connector
1B
I/O
Differential digital input+/output
R12
L12
R14
Pin 7
I/O
Single ended digital input+/output
1A
EX1A
Output Prog. excitation 120 ohms maximum load
1C
SIG1A–
Input
1D
1E
2A
IO1A+
SIG1B+
GND1
EX2A
Differential digital input–
Signal ground
Output Prog. excitation 120 ohms maximum load
R10&R11
R20
R19
R17&R18
R47&R48
L10&L11
L20
L19
L17&L18
L47&L48
R23
R13
R22
R24
R55
Pin 6
Pin 18
Pin 8
Pin 9
Pin 13
2B
IO2A+
I/O
Differential digital input+/output
R41
L41
R51
Pin 14
2D
IO2B
I/O
Single ended digital input+/output
R42
L42
R50
Pin 1
2C
2E
3A
3B
3C
3D
SIG2A–
GND1
Input
SIA3/CH
I/O
SIB3/CL
I/O
SOA3/TX
SOB3/RX
Differential digital input–
Signal ground
RS422A to MCU or CAN_H input+/output
Output MCU to RS422A or RS232
I/O
RS422B to MCU or CAN_L input+/output
R35
R49&R53
R25
R21
R26
L35
L49&L53
L25
L21
L26
R43
R54
R31
R38
R30
Pin 22
Pin 2
Pin 3
Pin 15
Pin 16
MCU to RS422B or RS232 to MCU
input+/output
R27
L27
R45
Pin 17
I/O
RS422A to MCU or CAN_H input+/output
R33
I/O
RS422B to MCU or CAN_L input+/output
3E
HSD5A
Output High side driver, 1 amp max.
R32
L32
R39
Pin 5
4B
SOA4/TX
Output MCU to RS422A or RS232
R28
L28
R36
Pin 21
4A
4C
4D
4E
SIA4/CH
SIB4/CL
SOB4/RX
HSD5B
GNDA
GNDB
114
I/O
MCU to RS422B or RS232 to MCU
input+/output
Output High side driver, 1 amp max.
Signal ground
Signal ground
R29
R34
L33
L29
L34
R46
R37
R44
Pin 12
Pin 20
Pin 19
R40
L40
R52
Pin 10
R5
L5
R16
Pin 4
R4
L4
R15
Pin 11
Index
Index
Symbols
100BaseT Ethernet 53
A
Analog debug channels 39
maximum logging rate 39,100
MCU 39
Battery backup voltage 39
Box battery input current 39
Box battery voltage 39
Box temperature on Nose card 39
Lateral Accelerometer 39
Longitudinal Accelerometer 39
MCU Reference voltage 39
Power supply +5V 39
Power supply -12V 39
Power Supply +12V 39
PSU temperature 39
Vertical Accelerometer 39
SCU3 100
Battery backup voltage 100
Box battery input current 100
Box battery voltage 100
Box temperature 100
Left battery voltage 100
Power supply +5V 100
Power supply -12V 100
Power Supply +12V 100
Programming Voltage 100
PSU temperature 100
Reference voltage 100
Right battery voltage 100
B
Backup battery 26
C
Comms connectors 60
Download connector 60
D
Dash connections
Compact dash
connections 89
connector 90
Steering wheel dash 92
19-pin connector 93
Left switch connections 93
loom connector 92
Right switch connections 93
Dash connectors 89
Compact dash 89
Deutsch Autosport connectors 15
contacts 16
Micro HE 19
Micro Lite HE connector 19
Micro Lite HE part numbering 20
part numbering 17
to connect 15
Digital inputs
Front left wheelspeed 47
Front right wheelspeed 46
Rear left wheelspeed 47
Rear right wheelspeed 46
Download connector 60
Download lead 62
Download path connections 63
F
Fitting an MCU 34
Fitting an SCU 102
fitting looms 30
Index
Index
G
Ground loops 27
Testing for 28
Index
117
I
P
Installation
Fitting an MCU 34
Fitting an SCU 102
Installing the MCU 33
Orientation 33
I/O cards
connections
SCU3 CAN card 114
SCU3 LVDT card 111
SCU3 Moog/LVDT card 112
SCU3 Pressure scanner card 113
SCU3 Selectronic card 110
PC Network 64
Cross over cable 65
PiNet 59
Programmable hysteresis 48
reference voltage 48
Programmable pre-scalar values 48,49
Remote switches
Fuel 93
Page 93
S
M
MCU 21
connecting the 21
MCU Digital channels 46
Digital Group 1 46
Digital Group 2 47
2A and 2B 46,47
Digital Group 3 50
3A and 3B 50
Digital Group 4
4A and 4B 50
MCU orientation 33
MCU power requirements 21
O
Octal passive junction box
Connector details 83,84
connector 1A 84
connector 1B 84
connector 2A 85
connector 2B 85
connector 3A 85
connector 3B 86
connector 4A 86
connector 4B 86
Omega dash connections 94
118
R
SCU3 connections 107
Digital Group 1 107
1A and 1B 107
Digital Group 2 108
2A and 2B 108
System 109
SCU3 connectors 104
details 104
Lefthand 55-way 105
Righthand 55-way 106
Sensor connections
ADC ref 74
absolute sensors 74
CAN link 70
Current sensor input 70
Debug mode input 70
Excite 73
Gain 73
Bipolar 73
Unipolar 73
ground reference 70
High Side Driver 70
Input 72
Mode 73
Bipolar 73
Unipolar 73
Moog Drive 70
T
Telemetry 88
connections 88
Tyre Performance System 87
connections 87
V
Vehicle battery 24
connecting to MCU 24
connecting to SCU 102
W
Wheelspeed
Front left 47
Front right 46
Rear left 47
Rear right 46
Index
Negative supply voltage 70
Positive supply voltage 70
RS232 input 70
RS232 output 70
RS422 input 70
RTD sensor 70
Selectronics I/O card 71
Signal negative input 70
Signal positive input 70
Special 74
Type 73
Differential input 73
Single ended 73
Serial comms ports 52
CAN switches 52
Dash 52
ECU input 52
MCU 52
Octal serial junction box 52
Pit communication 52
Telemetry 52
Tyre Performance System 52
Serial port 53,54,55,56
CAN switches 54,56
Dash 55
Debug port 58
ECU input 53
Pit communications 53
Telemetry 54
TPS receive 55
Star points 22
Steering wheel dash 92
Switches to CAN box 90,91
CAN connector 90
switches connector 91
System comms
Debug port 58
PiNET 58
Index
119
120
Conditions of use
Index
Pi Sigma Elite is intended for use in motorsport applications only i.e. not on vehicles used
on the public road network. For those vehicles that may be used on the public road network
e.g. Rally cars, it is the responsibility of the user to verify that the type approval of the
vehicle has not been compromised.
Index
121
Contact information
For more information about Pi products and details of worldwide authorized agents, please
contact:
Pi Research Limited
Brookfield Motorsports Centre
Twentypence Road
Cottenham
CAMBRIDGE
UK
Customer Support Tel +44 (0) 1954 253600
CB24 8PS
Fax +44 (0) 1954 253601
Pi Research LLC.
8250 Haverstick
Suite #275
Indianapolis
IN 46240
USA
www.piresearch.com
122
Tel
Fax
+1 (317) 259-8900
+1 (317) 259-0137

Pi Sigma Elite System

Transcription

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