VISA control putting devices into remote mode
So, I drop a VISA control on my fp. What I think is happening is when it populates, it is sending an *IDN? command to all the devices in the measurement and automation explorer. The problem with this is, some of the devices are in local mode, but if they detect something coming in over GPIB, they automatically switch to remote. I haven't tested it, but I have replaced the VISA control with a string control whos proper GPIB value is set from an INI file. I'm assuming this will solve the problem.
However, is it possible to have the VISA control on the fp and populate without it sending these devices into remote mode?
Message Edited by for(imstuck) on 05-18-2010 11:48 AM
CLA, LabVIEW Versions 2010-2013
Ravens Fan wrote:
I don't understand what you mean by "So, I drop a VISA control on my fp. What I think is happening is when it populates, it is sending an *IDN? command to all the devices in the measurement and automation explorer".
I don't know of any reason why that should happen. Try running NI-SPY or Portmon before doing this and see if you can capture a *IDN? command going out when it shouldn't be.
K, I'll do that. I guess what I assumed is when it (VISA ctl) populated its self, it went out and tried to find what instruments were actually there in order to know what to put in the VISA control drop down (i.e. GPIB0::1::INST,GPIB0::2::INST, etc). I assumed it may be doing this with an *IDN? command. I'll run the capture and see what's happening. For some reason when I start my program up, it's clearly sending other devices into remote mode by sending them something over GPIB that I'm not controlling. I know this because if I highlight execution, my code is in the idle state when these devices somehow get switched.
Hopefully NI-Spy will show me something.
CLA, LabVIEW Versions 2010-2013
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