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Summary of change:
CAN-bus must have 120 Ohm resistor termination on BOTH ends of the bus to prevent "reflection noise" ruining the signal (and communications). This means that '''DVM measures 60 Ohm''' * with module connected to the actual CAN-bus, but power off * (2 pieces of 120 Ohm resistors in parallel, effectively). This '''procedure must always be followed''': '''In general just measure across CAN+/- with DVM''' (ignition off) * if '''120ohm, add 120ohm termination (so it will be 60 Ohm)'''. Just a 120 Ohm resistor between CAN+ and CAN- * '''if 40 Ohm, there is an extra 120 Ohm termination somewhere''' (3 in total, there should be only 2) * '''60 Ohm: good''', only 2 terminators are there. Hopefully at the end of the bus (long CAN-bus will not work if terminators are not at the very end, both ends). Shorter CAN-buses are less sensitve. ---- If termination is OK (60 Ohm), watch aim2can moduls LED; * if 1Hz blink all is well * if 3Hz blink there is some problem (eg. termination BAD, or no acknowledge)
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