Quantum Data 802BT User Manual page 218

*ESR?
Class
Description
Query syntax
Returns
Related commands
208 Appendix A Command Reference
Event Status Register
GPIB
Returns the current value of the Event Status register. After this command is executed, the
Event Status register is cleared. This is the only way of clearing any bit in the Event Status
register except by the *CLS command.
*ESR?
registerValue NL
Where registerValue is in integer NR1 form.
*CLS, *ESE