Cannot see GPIB device in MAX after connecting another device to the same port!

[jerry3k]

I'm controlling a SUSS-prober PA200A using Labview to move around the chuck (for optical measurements). But now when i connect the HP-UX machine to the same prober's GPIB port (on top of this one), to get some electrical measurements, I can't see the GPIB device anymore on the Labview PC.

Basically i need to sync both my electrical and optical measurements but unfortunately have to use two different machines (PC and HP-UX) seperately.

Hope this helps!

PS: Can't use CIC or parallel polling as the prober gets invisible to MAX after parallel connection with HP-UX machine 😞

Jerry

[JÞB]

the most likely cause for this is having the same address set on both devices.  Connect the each one at a time and see if they both respond in MAX (and look at the address).

It is aslo possible that one of the devices has a hardware fault in the GPIB interface.  the same test will show you if the devices both work correctly.

[Dennis_Knutson]

And you certainly cannot connect two system controllers at the same time. If you have the GPIB controllers in the pc and hp-ux set to be cic and a system controller, change one. You will need to do quite a bit of modification to code for synchronization if you need them to both to be a controller at different times.