Quote:
Originally Posted by WizenedEE
However, the spike probably wouldn't let us make each side GND (it would just disconnect them if we turned it off) or 12V (why would it?).
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Yes it will. In LabVIEW, the Relay Set is an enumerated type with 4 states: On (both sides 12v), Off (both sides gnd), Forward (one side 12v, one side side gnd), and Reverse (other side 12v, and other side gnd).
The spike is really two relays, and the three-pin cable contains two digital lines (fwd and rev) plus ground. The first coil (fwd) switches m+ between GND and 12v, and the second coil (rev) switches m- between GND and 12v. The output is never disconnected. Hope that makes sense