I am trying to automatically trigger my data acquisition when I send a voltage (4.5VDC) to the screw terminal of my SC 2345. I was advised to send this voltage to terminal A11 (+4.5V) and to B12 (ground). As long as the SC 2345 is not plugged to the power source (in other words it is not powered on), when I have no voltage 'sent' to the terminal, I am reading to the voltmeter approx. 0 VDC. When I 'send' the voltage to the terminal I read the right value (+4.5VDC). NOW, when I power on the SC 2345, I read ALL THE TIME +4.5VDC to the voltmeter (the voltmeter is a physical instrument, not a vi). In other words, no matter if a voltage is sent or not , I am contin8uously reading the 4.5 VDC.
It is important to have this
on/off voltage at SC 2345 because besides my vi, I have a separate DAQ card that will start working when it gets the 4.5V and will stop recording when voltage drops under 0.5VDC.
What should I do? What seems to be the problem?
If still A11 and B12 are the right terminals, what channel should I select in my vi for this incoming voltage? (to be able to start and stop my DAQ when the voltage comes in or drops to 0, respectively).
