Timing out at VISA READ

[jbrewer6]

Hey Everyone,

I have a program where I am sourcing a constant voltage and measuring I over time. When I start the VI, it runs through like it should and loggs the first data point. On the second run through, it times out at my VISA READ right before it is suppose to write to file. The real issue is the VI was working fine until my instrument was sent in for repairs and now the VI won't operate properly. I have another VI where I sweep the voltage and measure current and it still works. What is going on with my VI?!?

Thank you,

jbrewer6

[MXI Master]

jbrewer6,

What instrument are you communicating? Where did this VI come from, is it part of an Instrument driver that was created by the manufacture of the instrument or NI, or did you write it yourself?  I will be happy to help, but I will need a few details.

As for cause, I have a feeling they may have updated the firmware on your instrument, you may look into what has changed in the latest version of the instruments firmware. Also, were repairs made to the portion of the instrument that measures the voltage?

[jbrewer6]

We think we figured out the problem. We are using a keithley 2410 source meter on a program we wrote ourselves. The added another write command into the schematic and changed it from asynchronously to synchronously. What is the difference between the two?

[MXI Master]

Here is a great Knowledge Base on all the diffrences between the two. I would try to rephrase, but this hits it on all levels.