GPIB vs COM-port=program stall...

[TK]

I've made a program which use the com-port to read data from a test object. This serial reader execute continiously. At the same time I use the GPIB to control a switch/control unit.This causes the program to halt.If I then toggle between the front panel and the diagram
the execution continue. Can anybody tell me what cause this problem, can it be due to an IRQ
conflict or something........?

[wha]

Hi,

I typically have this kind of application. A temperature-chamber is connected to
COM-port and controlled. In parallel there are GPIB-Instruments under control - like
power supply & multimeters.
But your problem is like finding a black cat in the dark.
Send your program as .llb (zip) to werner.hasche@web.de - I try to do my best.......
Regards
wha