Technical data

Command Reference 5
Programmer’s Guide 51
Standard Event Status Register Query
*ESR?
Queries and clears the standard event status event register. (This is a
destructive read.) The value returned reflects the current state (0/1) of
all the bits in the register.
Range: Integer, 0 to 255
Example: *ESR? returns a 1 if there is either a query or command error, otherwise
it returns a zero.
Identification Query
*IDN?
Returns an instrument identification information string. The string will
contain the model number, serial number and firmware revision. The
response is organized into four fields separated by commas. The field
definitions are manufacturer, model, serial number and software
version.
Example: *IDN? returns instrument information, such as:
Agilent Technologies, N9342C, 45310116, A.01.02
Key access: SYS > More > Show System
Operation Complete Query
*OPC
*OPC?
Sets bit 0 in the standard event status register to “1” when all pending
operations have finished.
The query stops any new commands from being processed until the
current processing is complete. Then it returns a “1”, and the program
continues. This query can be used to synchronize events of other
instruments on the external bus.
Returns a “1” if the last processing is complete. Use this query when
there’s a need to monitor the command execution status, such as a
sweep execution.