*ESR?
*ESR?
Syntax
*ESR?
Description
This command queries the event register for the Standard Event Register group. This is a read-destructive register, and the bits are cleared when you read the register.
For more information on the Status System for the instrument, see Status System Introduction.
Remarks
- The following table lists the bit definitions for the Standard Event Register.
Bit # Bit Name Decimal Value Definition 0 Operation Complete 1 All commands prior to and including *OPC have been executed. 1 Not Used Not Used 0 is returned. 2 Query Error 4 The instrument tried to read the output buffer but it was empty. Or, a new command line was received before a previous query has been read. Or, both the input and output buffers are full. 3 Device Error 8 A device-specific error has been generated. For a complete listing of the error messages, see Error Messages. 4 Execution Error 16 An execution error occurred. These error codes are in the range -100 to -199. 5 Command Error 32 An command error occurred. These error codes are in the range -200 to -299. 6 Not Used Not Used 0 is returned. 7 Power On 128 Power has been turned off and on since the last time the event register was read or cleared.
- In order to be reported to the Status Register, the corresponding bits in the event register must be enabled using the *ESE command.
- Once a bit is set, it remains set until cleared by reading the event register or execution of the *CLS (clear status) command.
Return Format
The query reads the event register and returns a decimal value which corresponds to the binary-weighted sum of all bits set in the register (see table above). For example, if bit 2 (decimal value = 4) and bit 4 (decimal value = 16) are set (and the corresponding bits are enabled), this command will return +20.
Example
The following query reads the event register (bits 3 and 4 are set).
*ESR?
Typical Response: +24