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Intermittent error - 420 query unterminated

Question asked by dedenne on Aug 27, 2012
Latest reply on Apr 29, 2013 by connectivity
I have this intermittent problem where LabView 8.5 is waiting for the E4417A (firmware A2.05.00) to return a status bit.  On the PM there is a query unterminated error. 
These are the commands sent to the PM.


The following is in a loop to read multiple frequencies
STB?     <-- This is where it gets hung up.

This code has been running for years and works with other power meters.  I'm not sure there is something wrong with this particular power meter or if we are now seeing a bug in the code.

Any help would be appreciated.  Thanks!