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NI 6229 DO Feeding Signal Into NI 2503 ME

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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! 

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Accepted by topic author testdesign

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).

John M.
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