Why is the instrument reporting “QUERY UNTERMINATED” or “-420” error when using Prologix GPIB-USB controller?
After sending any command to an instrument, Prologix GPIB-USB controller will address it to talk to read the instrument’s response. If the command does not generate a response (often called non-query commands), some instruments generate the above error when addressed to talk. In effect the instrument is saying, you have asked me to talk when I have nothing to say. The error is often benign and may be ignored. However, if you want to avoid the error you have two options: Use the ++auto 0 command to turn off the read-after-write feature before issuing a non-query command. Later use the ++auto 1 command to turn the feature on to read instrument response when issuing query commands.
Related Questions
- Why is the instrument reporting QUERY UNTERMINATED or ERROR -420 error when using Prologix GPIB-ETHERNET controller?
- Why is the instrument reporting QUERY UNTERMINATED or ERROR -420 error when using Prologix GPIB-ETHERNET controller?
- Why is the instrument reporting "QUERY UNTERMINATED" or "-420" error when using Prologix GPIB-USB controller?
- How is Prologix GPIB-USB controller different from other vendors?
- Can Prologix GPIB-USB controller talk to multiple instruments?
- Can Prologix GPIB-USB controller talk to multiple instruments?
