bit 0 OPC (operation complete)
cleared by most commands
set when data available or sweep complete
bit 2 QYE (unterminated query error)
set if no message ready when data read
bit 3 DDE (device dependent error)
set when the instrument has an error
bit 4 EXE (execution error)
set when the command cannot be executed
bit 5 CME (command interpretation error)
set when a command has not been recognised
bit 7 PON (power on event)
set when power first applied or unit has reset
The bits in the standard event status register except for
OPC are set by the relevant event and cleared by specific
command (*ESR?, *CLS, *RST). OPC is also cleared by
most commands that change any part of the configuration
of the instrument (such as MODE or START).
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