Network Termination

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

The HS-CAN uses a network termination circuit to improve communication reliability. The network termination of the HS-CAN bus takes place inside the termination modules (ABS module and IC) by termination resistors. Termination modules are located at either end of the bus network. As network messages are broadcast, in the form of voltage signals, the network voltage signals are stabilized by the termination resistors. Each termination module has a 120 ohm resistor across the positive and negative bus connection in the termination module. With 2 termination modules on each network, and the 120 ohm resistors located in a parallel circuit configuration, the total network impedance (resistance) is 60 ohms.

Network termination improves bus message reliability by:

stabilizing bus voltage.
eliminating electrical interference.