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Canbus using 2 AnalogX's
Posted: Thu Sep 26, 2019 2:40 pm
by PS14
Seasons over so im looking to clean up/simplify my wiring. I am looking to switch every sensor over to a canbus style harness. 8 linear sensors and two canbus AFR controllers. by using two AX's (one each end) and the AFR's/MK2 in the middle. would this work properly as far as canbus termination. see attachment for a sketch. thanks Dave.
Posted: Thu Sep 26, 2019 4:56 pm
by ferg
AX1 & AX 2 should have CAN termination, all of the other CAN devices should not have termination.
Posted: Thu Sep 26, 2019 5:05 pm
by PS14
I believe the AX's are terminated by default, which is why I put one on both ends. the AFR's are not, so are you saying this schematic is correct? thanks for replying.
Posted: Thu Sep 26, 2019 8:07 pm
by ferg
It seems like all the ASL devices have a the CAN bus terminated, and you cut a trace (or disable in software) the termination resistor. I was just responding that you should have termination at your two "end" devices, and none on any of the device in between. The lengths of your "branches" on the CAN bus should be 18" or less per the CAN bus spec, and the CAN Hi & CAN Lo Signals should be twisted together, about 1 twist per inch. Many CAN bus implementations don't meet all those specs and they work. But you can be sure things will work if you follow the spec.