Hello! I have a VI in which quite a few commands are sent to various GPIB devices through VISA calls. Each call opens a device, either reads or writes, then is wired to 'clear errors' or an error handler. This is the latest in a series of such programs which are all working fine with the rack of GPIB kit they talk to. Well, this latest VI begins erroring at a certain point. All VISA calls past a specific point in the program give "device not found" errors even though the same devices have been called successfully earlier in the program. The GPIB circuit seems fine. I've tried eliminating the offending part of the program completely and still, past a point on the block diagram, i get these mysterious errors.
Timing doesn't seem to be t
he problem since it fails even when stepping slowly through the diagram.
The programs are translated from HP-BASIC, and the original BASIC program works fine sending the same commands exactly.
First just wondering if anyone might have heard of such behaviour, before I post the VI here. It's a bit chunky and needs a few sub-VI's.
Cheers, Nick
PS Can a GPIB device mess up the whole GPIB circuit if something goes wrong? If so that might explain it.
