topic Re: lem 4000 GPIB in Instrument Control (GPIB, Serial, VISA, IVI)

lem 4000 GPIB

wv — Fri, 28 Jul 2006 18:22:15 GMT

I have a LEM 4000 with GPIB option. When I scan for instruments in MAX I can't find it. I have tried other equipment and MAX finds it no problem, my PC and GPIB card seems OK. I have tried to connect to the LEM 4000 with a different PC which a different GPIB card and I still can't find the LEM 4000. It seems that my hardware is OK but for some reason the LEM does not respond to the IDN?. The only thing I can change in the LEM is the GPIB address (5).

Does anybody have experience with the LEM 4000 and GPIB with MAX?

Thanks very much!

WV.

Re: lem 4000 GPIB

Henrik_Volkers — Mon, 31 Jul 2006 12:17:59 GMT

MAX will identify your device with the SCPI command *IDN? , but if your device don't know that request, how should MAX know?

A brief ~~RTFM~~ look into the manual might give you an answer if the LEM 4000 understand the IDN

Have you searched the NI driver lib, maybe there is already a driver for your instrument. If not contributions are wellcome 😉

Re: lem 4000 GPIB

JasonSmith — Fri, 01 Sep 2006 21:56:21 GMT

Hi WV,

Have you resolved the problem you were having with this?

If you have not resolved the issue, there are two types of problems you could have in MAX:

MAX reports that there are no instruments present. This indicates that there is no communication between the PC and your instrument. Common causes include conflicting GPIB addresses on the bus or cabling issues. Verify that none of your GPIB Primary addresses are conflicting, replace your cables if possible, and try again.
MAX finds the instrument, but cannot query the device name. This is the situation which the previous poster addressed. This is often caused because the instrument does not support the *IDN? command. This is usually not a problem, and communication with the device is successful if the proper command is used.

Let us know if you have solved this issue,

Jason S.
GPIB & Serial
National Instruments

Re: lem 4000 GPIB

wv — Tue, 05 Sep 2006 13:06:33 GMT

Thanks much for the reply,

I have recently found out that it simply is a setup in the LEM that is not in the user manual. It works no problem at the moment.