Use the CAN feature

This page has been updated on the 05 August 2011.


C4D CAN has the following specificities:

  • The digital input 1 is reserved for the K-Line protocol. This input continuously provides 6V.
  • The green wire of the C4-D grey DB9 (pin 3) must be connected to the CAN HIGH signal.
  • The blue wire of the C4-D grey DB9 (pin 2) must be connected to the CAN LOW signal.

Note: The ISO9141 interface uses digital input 1 AND output 1 for the K-line protocol.

Connect the C4-D to the CAN bus

See the pin out table for more details.

Termination resistor

The CAN bus cable must be connected using a 120 Ohm resistor at each end in accordance with SAE J1939-15 Physical Layer “Light”. So, check that there is a termination resistor on each end of the CAN bus using a multimeter. The resistance should be 60 Ohm (two 120 Ohm resistors connected in parallel).

The table shows when there is to be a termination resistor in CAN/FMS interface or in the device connected to CAN/FMS interface.

CAN/FMS interface C4-D Comment
120 0 Add a 120 Ohm resistor
120 120 Correct
60 0 Correct
60 120 Remove the resistance (Contact us)

If needed Mobile Devices provides a 120 Ohm resistor to complete the installation.

Wire Signal

FMS module

We provide a sample module (fmsReader) which is able to retrieve the following data:

  • FMS total fuel used
  • FMS Fuel level
  • FMS axle location
  • FMS truck axle weight
  • FMS total engine hours
  • FMS vehicle identification
  • FMS software identification
  • FMS High resolution total vehicle distance
  • FMS next regular maintenance
  • FMS engine coolant temperature
  • FMS standard information
Download Size
fmsReader source 2.3 12.1KB
fmsReader source 2.4 11.9KB
fmsReader guide 103KB