daqmx

[twophoton]

Hi, Ed:

Thank you very much for your answer to my first question. Now I have two questions.

 I am going to connect an analog triggering signal to the NI 6251 board. The default channel for an analog triggering signal is APFI 0.

1). The 'Device Pinouts' in Measurement and Automation Explorer indicates pin 20 is APFI 0. However, the connection diagram of connection block SCB-68 defined pin 20 as AO EXT REF and pin 11 as PFI 0/AI START TRIG. I wonder which pin I should use for an analog triggering signal.

2) Should I connect the ground of an analog trigger to an AI GRD or a D GRD pin?

Thank you.

Jin

[Marni]

Dear Jin,

1. The connection diagram of the SCB-68 is the updated diagram for the NI-6251. If you want to have a connection diagram for your SCB-68 that is updated, print out the diagram found in the KnowledgeBase titled SCB-68 Quick Reference Label for M Series and tape it to your SCB-68. Input your analog triggering signal into the APFI0 line (pin 20).
2. All of the grounds are connected on the M Series boards, so it doesn't really matter, but technically you should put it into the AI GND line since the analog trigger is an analog line.

Have a great day!

Marni S.

[gianko25]

I have the same problem using an scb-68 with an M-6289. I connect the reference trigger to the APFI0 but it seems not to see the input signal. The negative voltage of my floating signal used to trigger is connected to the AIGND. What could be the problem?

Thanks