The -RC1 comes out of the box set to ID 1, but the DIP switch settings in the Unitronics documentation are confusing as it's not clear which is up or down - black or white. The switches themselves are actually white, but the drawing shows them as black: So ID #2 is switch 2 up. Or it could be this. If the bus is powered and the switches are right, CANbus works. Joe T.