Digital I/O on UMI 7772 attached to PCI-7340

[rhoward99]

I am trying to use the digital input connector on my UMI-7772 to attach a 4 position (micro-switch) joystick. Before making a cable, I am trying to test the inputs on the 7772. According to the user manual, I should be able to hook a switch between Viso and any digital input. I have tried connecting pin 5 to pin 1 (Viso to DI 1), but I do not see an active state (using Read I/O Portal or Read Digital I/O Data.vi) on the port.

Also, I am not seeing +5VDC between Viso and Ciso on the connector, even though I have verified a good +5VDC at the Viso power connector.

If I connect the digital port on the PCI-7340 to an SCB-68 breakout, I can see the DI properly. However, I prefer to use the digital port on the 7772. I prefer not to use an SCB-68 unless it is my only choice.

Any suggestions?

Regards,

Rick

[Wee-Bey]

Have you verified that you can see an active high on those digital ports on the UMI from another source? Is that what you mean when you mention the SCB-68?

[rhoward99]

Yes. If I connect my SCB-68 directly to the digital I/O port on the 7340, I get voltage and see the digital inputs just fine.

I have done more testing, and it looks like the issue is the Viso pin. If I jump straight across from the Viso input to a digital input, I see the pin go high, just as expected.

It appears that the Viso on the 25 pin digital connector of the 7772 is not functional.

Regards,

Rick

[Wee-Bey]

It sounds like based on your configuration, this Viso pin should be outputting data. Do you happen to have another UMI to try it with? If not, you might have a bad pin.