Esr - Keysight 8990B Programming Manual

2 IEEE-488 Command Reference

*ESR?

The *ESR? query reads the event register of the Standard Event register group and
returns a decimal value which corresponds to the binary-weighted sum of all bits
set in the register. The return format is <NR1> in the range of 0 to 255. The bits are
cleared by executing this query or *CLS.
The following table lists the bit definitions for the Standard Event register:
Table 2-2 Bit definitions: Standard Event register
Bit Weight/Decimal value
0 1
1 2
2 4
3 8
4 16
5 32
6 to 7 –
Refer to
Syntax
Example
*ESR?
52
"Standard Event register"
?
*ESR
Returns the bits currently set in the event register.
Definition
Operation complete
Not used
Query error
Device-dependent error
Execution error
Command error
Not used
on page 40 for more details.
Keysight 8990B Programming Guide