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!

[~jiggawax~]

You will have access to experts more related to your issue if you post in the correct forum.  I'd recommend the Instrument Control forums: http://forums.ni.com/t5/Instrument-Control-GPIB-Serial/bd-p/140

[Crazywu]

The Error -420 means the instrument was addressed to talk, but there was no message. The "initialize.vi" VI has the ID query input defaulted to TRUE. Try setting that to FALSE and see if that works.
useful link:http://www.tek.com/sites/tek.com/files/media/document/resources/scpierrs.txt