Agilent Technologies N1996A-503 User Reference page 338

Using The Status Monitoring Subsystem
Standard Event Status Register
The standard event status register contains the following bits:
Bit Description
Bit Description
0 A 1 in this bit position indicates that all pending operations were
completed following execution of the *OPC command.
1 This bit is for GPIB handshaking to request control. Currently it is set
to 0 because there are no implementations where the spectrum
analyzer controls another instrument.
2 A 1 in this bit position indicates that a query error has occurred.
Query errors have SCPI error numbers from -499 to -400.
3 A 1 in this bit position indicates that a device dependent error has
occurred. Device dependent errors have SCPI error numbers from
-399 to -300 and 1 to 32767.
4 A 1 in this bit position indicates that an execution error has occurred.
Execution errors have SCPI error numbers from -299 to -200.
5 A 1 in this bit position indicates that a command error has occurred.
Command errors have SCPI error numbers from -199 to -100.
6 Unused.
7 A 1 in this bit position indicates that the instrument has been turned
off and then on.
The standard event status register is used to determine the specific event that set bit 5 in
the status byte register. To query the standard event status register, send the command
*ESR?. The response will be the decimal sum of the bits which are enabled (set to 1). For
example, if bit number 7 and bit number 3 are enabled, the decimal sum of the 2 bits is 128
338 Chapter 6