Contact Sensing

[´MikeSv]

Hello everyone.

I have a USB-6225 with 80 Analog input channels and 2 Analog output channels.

For a project I need to sense if a contact is connected or not.

As a test I want to take a banana connector, male and female, connect to to the DAQ and see if it is plugged or unplugged.

The problem is that I have no clue how to connect to my DAQ.

Can I do this with one of the analog inputs? One end of the contact into an input and the other to GND? 

(But then there isnt any voltage across the connector)

Thanks in advance, 

best regards,

Michael

[Henrik_Volkers]

If you look into the M-Series User Manual  (RTFM 😉 ) you can find at fig. 6-4 the wirering for an switch input. (you need an additional pull-up resistor) , Since this type of input is an digital one (On-OFF) you usually use an digital input, but you also can (ab)use an analog input if you really want to 😄

[´MikeSv]

Hi Volker and thanks for your reply!

Yeah, I found that too! 😞

I switched to the digital Inputs instead where I can have a dc voltage over the contact.

best regards,

Michael