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 | ||
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 | ||
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| 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 | ||
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| NOTE: Connection Pins 9, 10, 11, and 12 are reserved for future use, or |
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| are used in the factory setup of CANdrive modules. Do not connect wiring |
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| or equipment to these terminals. Connection can result in permanent |
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| damage to CANdrive modules. |
Section 78 | |
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