Discussion:
resistor
(too old to reply)
Tom Haggerty
2008-01-03 13:10:08 UTC
Permalink
If there are no resistors used, there is nothing to develop the signal and CAN communication is impossible.  If the resistors are too large, then noise (electrical interference) can affect the signals and you may see more frequent error frames.  A smaler resistor is also not good.
 
Tom
Tom Haggerty
2008-01-03 13:10:07 UTC
Permalink
The 120 ohm resistor is specified by the ISO standard (11898) for CAN networks.  The hardware for CAN has been designed to use this value.  It should be noted that not all nodes on the CAN bus need the resistor only nodes designated as the "ends" need this resistor.  There should be two nodes that have the termination resistor.  All other nodes should be between the end nodes and not have the resistor.  I hope this helps!
 
Tom 

Loading...