GPIB Initialization problems

[Dennis_Knutson]

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@belfast wrote:

I have the same problem here... i found out it was because .. MAX actually did initialize the GPIB interface when u scan instruemtns.. Meanwhile, if u run ya program in LABVIEW. Eg: communicating with non-HP instrument, GPIB initialization is required!!! 

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No it is not required. I have not used the low level GPIB functions in years (use VISA) and certainly not the GPIB initialize. What makes you think its necessary?

[belfast]

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No it is not required. I have not used the low level GPIB functions in years (use VISA) and certainly not the GPIB initialize. What makes you think its necessary?

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thanks for response....haha.. currently working on LabVIEW automation for my final year project. i have 1 of my instrument(Wentworth wafer prober) have problem for every first time(everytime i switch it on) i send command from LabVIEW into it where i think it was the same case u have here..When i use MAX and return into it... it will become normal again.. could u asist me please... currently i assumed it was the GPIB interface issue ...

[belfast]

By the way .. i did use VISA for both the instruments i am using... however, it works on the HP instrument but not on the non-HP one

[JÞB]

Are you wiring a 2 to the mode input of the GPIB write? (the manual for the Fluke 45 can be found here) GPIB write with Mode =2 appends the <LF> character and asserts EOI on <LF>- just like the manual asks.  VISA defaults to this behavior for GPIB resources (in later versions of LabVIEW) as I recall there are some ideosynchrocies in the 6i VISA. (and modern VISA drivers would not support such an old LabVIEW revision).  

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@belfast wrote:

By the way .. i did use VISA for both the instruments i am using... however, it works on the HP instrument but not on the non-HP one

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Is the big clue here- HP kinda did a better job writing 488 interfaces (it used to be called Hewlett-Packard Interface Bus after all) Fluke burned a few revisions that implemented 488 standards with only fair overall performance.