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Section 78 00-02-0618
04-10-07 - 4 -
Terminal Functions
PIN Function
1 Negative DC, power supply
2 Positive DC, power supply
3 Negative DC, gage common return
CANdrive modules are supplied for use with 12V (7 to 16V) DC operation. If 24V
(19 to 30V) DC operation is required, remove (cut) rear link L2.
Connect a 1 Amp anti-surge fuse in the positive DC line (pin 2).
4 Oil pressure gage output
6 Coolant temperature gage output
Pins 4 and 6 give a variable current output for driving oil pressure and coolant
temperature electric gages. The current versus pressure/temperature curve is
specific to each gage type, and must be selected by cutting appropriate links L3, L4
and L5 - see Configuration section above.
7 Tachometer output
Pin 7 gives a square wave output (0V to battery positive DC), with a frequency that
is proportional to engine speed. At 1500 RPM engine speed, the output is
approximately 121 Hz, suitable for driving charge alternator based tachometers
such as the Murphy AT(H)A series. Pin 7 gives no output below 100 RPM engine
speed.
Connect each output to the appropriate gage/ tachometer signal input.
Gage/tachometer negative terminals should be common to battery negative, ideally
via dedicated wiring to terminal 3. (The use of dedicated return wiring to pin 3
rather than a ground return will minimize gage inaccuracies caused by ground
noise.)
5 CAN Hi
8 CAN Lo
Connect these terminals to the engine CANbus, taking care to observe the correct
polarity. The CANbus cable screen/shield is typically connected to ground at the
ECU end: refer to the engine manufacturer’s installation guidelines.
CANdrive modules are supplied with a 120 Ohm network terminating resistor fitted
in-circuit between CAN Hi and CAN Lo. If CANdrive module is not positioned at the
end of the CANbus network, remove the resistor by snipping out rear link L1.
9 Reserved for future use
10 Factory use
11 Factory use
12 Factory use
NOTE: Connection Pins 9, 10, 11, and 12 are reserved for future use, or
are used in the factory setup of CANdrive modules. Do not connect wiring
or equipment to these terminals. Connection can result in permanent
damage to CANdrive modules.