connect digital signals to NI USB-6341

[theodoros]

Hallo,

I have three digital signals from simple switches, with two cables each. I want to connect them to the NI-USB 6341 but i am confused. In which physical channels should I connect? I tried i.e. for one switch to connect one cable to Channel 81 (PFI8/P2.0) and the other to Channel 82 (D GND) but without success.

thanks for your help,

theodoros

[Ioannis K.]

Hi Theodore,

connect one cable to pin 65 (P0.0) and its reference to pin 82 (D GND). Accordingly 66 (P0.1) and 67 (P0.2) to 84 and 86 (D GND). All D GNDs are internally connected, so choose what fits best to your cables. You can even attach all reference cables to pin 82.

Take a look at this video:

Acquire and Generate Digital I/O with NI USB X Series

http://www.youtube.com/watch?v=oJ6obDD-InA&feature=player_embedded#!

Cheers,

Jannis (the greek NI community)

[theodoros]

Hi,

sorry for taking so long to reply. In the end i found out that you need a 5V digital input for this  device.

the -not so elegant- sollution is to program a digital channel to constantly give 5V output and connect it to the signal input channel (if it is just an open close contact, like in my case) . 

but this sollution is ok if you have digital channels to spare (you need 2 digital channels per signal), otherwise you have to use an external 5V power supply which you will connect with the signal in parallel.

thanks,

thodoros