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CAN-Bus Terminal Resistors

Terminal resistors used in the CAN-Bus circuit establish the correct impedance to ensure fault free communication. A 120 Ohm resistor is installed in two control units of the CAN between CAN-H and CAN-L. Because the CAN is a parallel circuit, the effective resistance of the complete circuit is 60 Ohms. (Ohms' Law of a Parallel Circuit).

The resistance is measured by connecting the appropriate adapter to any of the modules on the CAN and measuring the resistance between CAN-L and CAN-H. The resistance should be 60 Ohms. The CAN-Bus is very stable and can continue to communicate if the resistance on the CAN-Bus is not completely correct; however, sporadic communication faults will occur.

Modules which do not have the terminal resistor can be checked by disconnecting the module and checking the resistance directly between the pins for CAN-H and CAN-L. The value at these control units should be between 10kOhms and 50kOhms.

NOTE: When checking the resistance of the CAN-Bus remember to disconnect the power to the circuit and to leave all modules connected.
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