Newport ESP300 GPIB communication stops after query

Hello

I'm trying to control a Newport ESP300 via GPIB controller with labview and I encountered a problem that I saw in the forums.  I can tell the controller to move to different positions, to wait, to change speeds, etc., without error.  However, when I ask the device, it stops all communications with Labview.

Example of

1 MB //axis 1 on

1pa2 //move axis 1 absolute in position 2

wait for stop 1WS

1AP?     absolute position of query

2 response //ESP300

1pa3 //NOTHING ARRIVES

1MF NOTHING HAPPENS

GPIB READ.vi a mode = 2 (to end the LF character) to terminate the operation of reading as specified by newport, but the communication stops everytime I interrogate the device.

I tried to do what this last newport mentions, without effect.  FTP://download.Newport.com/MotionControl/archive/motion%20Controllers/ESP300/software/ESP300%20GPIB%...

I should mention that I couldn't disable autopolling (the box is grayed out).  Although I don't think that's the problem.  I also tried to replace the GPIB READ.vi with code on VISAS, but this has no effect.

Sending of the same series of commands through NOR-MAX does not show this strange behavior.  I tried to ask about it in Newport, but they were not able to help.  Anyone has any advice on how to reliably read/write by GPIB with the ESP300 controller?

Thank you.

I found the problem.  It turns out that when you use the GPIB READ.vi, I had put the number of bytes to a value that was too small.  Thus, reading finished early, leaving the rest of the message in the buffer.  I don't know exactly why it resulted in a 'freeze' of communications, but he did.  Increase the number of bytes to 255 has solved the problem.

Tags: NI Hardware

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