Regarding NI PXI-6602 - How to route PFI_33 to a grounded DIO Line.

[Tim P]

The PXI-6602 card with the TIO chip seems to be very robust on counter and DIO pin assignments and routing, but I have found that counter 1 has a pin (PFI_33 -AUX IN (UP/DOWN) ) that has been troublesome.  I need to either route this pin to another pin such as a DIO pin set as an output and pulled LOW or be able to manipulate the pin to a low state when I setup counter 1.  This is to ensure that noise is kept to a minimum due to the PXI-6602 being cabled to a board with a PLD on it.  Any solutions on how to tie PFI_33 low?

-Tim

[bspears]

Hi Tim,

It sounds like you want to keep that PFI_33 pin permanently low. Jumper this pin to the ground pin through a pulldown resistor of about 10kΩ. Pin 41 or 39 are the closest ground pins to PFI_33.

Hope this helps!

B Spears

[Tim P]

B Spears,

Looks like I'm heading down that path... We were looking to do it in software, but nothing has come to light.  Interesting enough, DAQmx has a good sub-vi (DAQmx Connect Terminals.vi) but I am dealing with code back from LABView 5 days utilizing Traditional DAQ.  Try writing a snipet utilizing both "Write to DIO.vi" and "DAQmx Connect Terminals.vi" and watch the error codes fly. 

One option NI has offered was to re-write the DIO tasking in DAQmx instead of traditional... this maybe an option... but, wow!  That's a lot of code.

Thanks for the reply B Spears,

-Tim

[bspears]

Hi Tim,

That's totally true that you can do it in software as well but you would need to use DAQmx. You would have to a create a channel or task for counter operations and then another channel or task for digital IO with one of the unused digital lines. Make one of the digital lines low and then use DAQmx Connect Terminals.vi to connect PFI_33 to that digital line.

Have a good one!