Talk to the two devices at the same time.

Hello

I wonder that you could help me with my solution.

I use GPIB to talk to two devices. I need to reset and align a device and control unit B. The process can take up to 2 minutes. Process B is to refresh of the ESA to the required temperature and it can take up to 3 minutes to reach the required temperature. To monitor these processes I use the pull method and:

  • for the process to use the STATp.: COND? query (is this 1?)
  • V use TEMP for the process? query (get the temperature, is the answer within the limits of output?)

Now, these processes one by one. But, because the two processes must be done every time before HAD tested (as part of an implementation of the test procedure), I would like to take some time to test. Technically, the two processes are independent, I can trigger them almost at the same time and wait when the plu completes itself, and pass them to the part of the tests.

However, the first attempt to go has failed. When I published the STATp.: COND? query to the breast of the connection to the device has what looks like all GPIB bus is blocked and I cannot issue the TEMP? mark on the device B, as the bus seems to be waiting for the STATp.: COND? command sent to the device has to finish.

Strange thing is that then I throw the STATp.: COND? order for the first time, the device is not able to accept all other orders.

Why?

What is the right approach to this test time saving?

Asking a statusbyte shouldn't block the system, because it must be managed in the external chip GPIB devices.

So use the "VISA read STB" instead of * STB via via writing.

This function is located in the VISA palette

Tags: NI Hardware

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