GW Instek GLC-9000 User Manual - Manual (Page 155)

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Event Registers
The Standard Event and Questionable data register groups have
event registers. The Event registers are read only and are used to
determine the status of the instrument. If any bit in the event
registers are set to 1, it means that the corresponding event has
occurred. The event registers will only be cleared when the power is
turned on or if a *CLS or *ESR command is used.
Restoring the default settings or using the *RST will not clear the
event registers.
Querying the event registers will return the value of the weighted
sum of all the binary bits.
Enable Registers
Setting any bit to 1 in the Enable Registers, allows the corresponding
bit to be enabled in the Event Registers. The Enable Registers are
logically summed to form a summary of the (enabled) events in the
Questionable Data and Standard Event registers.
Querying the Enable registers will not clear the registers, however
the *CLS command will clear any enabled bits in the event registers.