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For questions about the Standard Commands for Programmable Instruments ("SCPI") standard, which defines the syntax and commands for controlling electronic instruments such as power supplies and oscilloscopes.
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GPIB/SCPI Error Codes
Query unterminated usually means you tried to read from the instrument when it had nothing in its buffer to send. If you send a command, you should only use write, not ask. Only use ask for queries. I …
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Retrieving data from Agilent 34401A Digital Multimeter over the RS232 interface
The Agilent devices require a somewhat esoteric form of flow control - DSR/DTR. You'll need to set that up before you can read data.