The problem about GPIB Wait

[KBLee]

Dear all,

First, Thank you for your attention!!!

I have to use a network analyzer to perform a test for the return loss of antenna. For convenience, I have to use both port 1 and port 2 in order to test two samples together. Because I plan to use mechanical button to trigger the test, this may have problem to cause a crash when two requeust arise together.

May I know whether I can use the function GPIB wait to avoid it to happen?

THANK YOU VERY MUCH

[Dennis_Knutson]

I'm not sure exactly what you're trying to do. Are ports 1 and 2 different inputs to the same instrument? If you provide an external trigger to the instrument and don't want to do a read until the instrument has done a measurment, you could do a GPIB Wait for RQS (assuming the instrument issues RQS). Then you would do sequential reads of measurements 1 and 2.

[Michael_Munroe]

If your two mechanical buttons are read by LV and your code has two separate loops to allow both tests to run independently, then you should have a look at the example called Semaphore using SubVIs. Using a semaphore you can have the first button grab the semaphore and the second button will wait until the semaphore is released to start the test.

[KBLee]

Dear all,

Thank you very much!!! The information are useful but I still not very clear what to do.

May be I make the question simpler: If I have two programs to communicate with same device at the same moment, how to avoid confusion, can I make one program to wait until the other program finish communication and then start to wirte and read immediately, and the steps continue again and again