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Summary of change:
'''CAN bus voltage bias''', related to CanBus The noise tolerance, and sometimes even operation of the CAN bus depends on * termination (well known, typically 120 Ohm at/near each end of the differential pair). * voltage BIAS ---- '''Voltage BIAS''' Unlike the RS485 transceivers, the CAN transceiver only * pulls the CANL signal LOW (when actively transmitting) * pulls the CANH signal HIGH (when actively transmitting) '''TJA1050 has weak 25k bias toward 2.5V''' (VCC/2), but pullup/pulldown would '''seem desirable:''' * '''CANL: 10k pullup''' to +5V * '''CANH: 10k pulldown''' to GND It might work without these pullup/pulldown (it is easy to add externally, and the dash likely has it anyway), but it sounds safe and friendly to just include 10k (or at least a weaker 20k if very cautios).
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