SIGMATEK CCP 521 - CAN Bus Termination Requirements; Importance and Method of CAN Termination

CCP 521 C-DIAS PROCESSOR MODULE
Page 18 15.03.2016
CAN Bus Termination
In a CAN bus system, both end modules must be terminated. This is necessary to avoid
transmission errors caused by reflections in the line.
Device 1 Device 2 Device 3 Device n
e.g. CPU
DCP 080
e.g. Terminal
ET 081
CAN-Bus-Connections
CAN-Bus-
termination on
terminal module
D-SUB-plug
with terminating
resistors
e.g. Terminal
ET 805
If the CCP 521 processor module is an end module, it can be terminated by placing a 150-
Ohm resistor between CAN-A (Low) and CAN-B (High).
1 x 150-Ohm resistor