420 Query-unterminated

[HelloWorld2]

when I try to communicate to Keithley Model 2000 by GPIB-RS232,I send "*IDN?\n" it is OK. When I send another command like ":CONFigure:FRESistance\n" ,the device show " ERROR -420 Query unterminated". I don't know why.Tell me!Thanks!

[crossrulz]

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@HelloWorld2 wrote:

When I send another command like ":CONFigure:FRESistance\n" ,the device show " ERROR -420 Query unterminated".

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If you are trying to ask the instrument for what it is set to, you need a "?".  So your command really needs to be ":CONFigure:FRESistance?\n"