11-24-2014 11:18 AM
Hi everyone, I am feeding a pulse train signal (P2.0 PFI Signal) from my NI 6229 card to my NI 2503 MUX Card. I am switching the MUX in 2-Wire Quad 6x1 Topology. My PFI pulse train signal is going into COM1+ and I am closing MUX_CH6+ to be used for external signal. What signal will be on MUX_CH6-? Will it be a ground reference or a no connection? I know for a signal coming externally into the MUX then MUX6+ = SIGNAL HI and MUX_6-= SIGNAL LO but how about signals leaving the MUX and then feeding external circuitry. What does MUX_6- have on it?
Thanks so much!
Solved! Go to Solution.
11-25-2014 01:00 PM
The COM- isn't tied by default to anything. If you only have a PFI line into your COM+, then your COM-, and subsequently MUX_CH- won't have any signal on it (it's not tied to chassis ground etc.. so it's just a wire connected to nothing).