BV4626 Input

We've got it working and can talk to it using the VB demo etc, all good.

However I can't for the life of me work out from the manual how to use it for what we want.
Essentially we want to monitor a circuit to see if it is open or closed and tell the computer whether it is or not.

I'm sure I asked this before I bought it but it was a long time ago.

Can you confirm if this can do it, if so what wiring / commands I would need to do? If no what board do I need to get?

I can't go into the hardware details but here are some pointers assuming that you are using the serial interface.
If using the digital interface then set it to be an input esc[255s now all digital are input to see if the pin is high or low use esc[r The digital inputs have a low impedance due to the ULN2803 being connected so you may want to use the AtoD. In that case use esc[<num>D where num is the channel you wish to use.