Triggering Problems with a SCB-68 Terminal

[Moreno78]

Hello I nedd some suggestions about triggering with a SCB-68 terminal. I would like to make a triggered aquisition. I need to use to poles? That is, I nedd to connect the high digital pole (+5V) to the PFI0 screw terminal and the low pole (+0V) to the pin# 44 or is enough to connect the sole high pole to PFI0. If I measure voltage between pin#11 (PFI0) and pin#44 (GND) I get +5 V. Is that correct? How can I trigger my acquisition with a digital signal of +5V if the PFI0 already is at +5V? I don't understand Hope someone kindly help me. Thanks Moreno

[jflab]

Hello,

I don't understand why you connect permanent +5V to PFI0 because in that case you can't make a triggered acquisition by using PFI0 but anyway

Perhaps you can use PFI1 trig ext by declaring the good option in your AI start VI (trig digital option 2)

Good luck

jflab

[Moreno78]

Thank you so much for the answer.

There was a bad explanation maybe. I'm really using a trigger form +0V to +5V. The most important thing that I would like to know is: is correct the between PFI0 and the pin#11 (DGND) there are +5V without any external connection (at open circuit)

Thanks a lot

Moreno

[jflab]

Hello,

OK I undestand

You need to put a pull-down of 1k or 4.7k beetween PFI0 and DGND  (because of the internal pull-up at 5v of your DAQ card)

JFLAB

[Moreno78]

Thank you for solving my doubt!

Best regards!