Network Termination And Gateway Function

The CAN  uses 120 ohm resistors across the data (+) and data (-) at each end of the network main circuit branch, or "backbone", to improve communication reliability. Typically, the two termination resistors are located inside modules referred to as "termination modules". With 2 termination modules on each network, the 120 ohm resistors are arranged in a parallel circuit configuration which makes the total network impedance, or total resistance, 60 ohms.

Network termination improves bus message reliability by:

• stabilizing bus voltage.
• eliminating electrical interference.

The IC  is the gateway module, translating messages on the HS-CAN  to the MS-CAN  and vice versa. This function allows a message to be distributed throughout both networks.