Quote Originally Posted by irving2008 View Post
Ah... which position have you got J1 in... are your commons +5v or ground? If you have the commons at +5v then RTN needs to be connected to the -ve (ground) side terminal of the power supply input for the BOB, rather than a general chassis ground...
I will check in the morning, out of interest does the gnd pin on the BOB go to ground..lol