Agilent Technologies E4406A VSA manual Using the Instrument Status Registers, Chapter

Programming Fundamentals

Using the Instrument Status Registers

The standard event status register contains the following bits:

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 always set to 0. (The instrument does not request control.)
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	Currently not used.
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 plus 8. So the decimal value 136 is returned.

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