I send a '*IDN?' command to instrument. and he says...

[panda715]

Hi. I am studying physics at the University of Seoul.

I want to use Keithley 224 Current Source with Labview.

I send a '*IDN?' command to Keithley224, then I receive strange message. 'NDCI+0.0000E+0,V+3.0000E+0,W+5.0000E-2'

I think, this is the initial value of the instrument. (Source, V-limit, dwell time)

What is the problem with this machine? (I've attached a screenshot.)

I would like to deal with the LabVIEW program (v2011) for the Keithley224.

I try to use the driver provided by Keithley, but, Keithley224 does not recognize the command.

I attach here the vi file provided by Keithley and NI I/O Trace log.

Please, help me.

Thank you very much.

[Dennis_Knutson · Accepted solution]

You should have stuck with your original thread.

Where in the manual do you see the *IDN? query? You just can't make up commands to send.

You really need to provide details on your problem with the driver.

[panda715]

I found how to handle Keithley224 with GPIB.

I send a message, such as 'I%.3eX', 'D%dX'. Then, I can handle Source Value and etc.

Has caused any inconvenience to you, sorry.

I will learn more about how to use this forum. and I'll prepare more details on my problem before asking.

Thank you very much.

[rolfk]

The Keithley 224 is a rather old device, just as most other Keithley devices with 3 digit model numbers. At the time that device was designed SCPI commands were not the standard as they are today. So there is no IDN? or any other such command implemented. Most old Keithely devices implement a single letter command syntax, less readable but very concise. Also one strange thing about them is that they respond with the measurement values to any command they do not understand.