Keysight Technologies 34450A Programmer's Reference Manual page 114

2 SCPI Programming
Return Format
— This query command returns a value from 0 to 65,535.
— The command 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 command reads the event register (bits 3 and 4 are set).
*ESR?
Typical Response: +24
See Also
*ESE
*CLS
114 Keysight 34450A Programmer's Reference