BNC 1105 Universal Counter - Manual (Page 160)

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Queries the Standard Event Status Enable Register.
Return
Numeric data transferred as ASCII bytes in <NR1> format.
Notes
The Standard Event Status Enable Register is cleared and set to “0” after the
counter has been turned off.
This value is unaffected by save/recall and *RST.
*ESR?
Queries the Standard Event Status Register.
This event register captures changes in conditions, by having each event bit
correspond to a specific condition in the instrument.
An event becomes TRUE when the associated condition makes the defined
transition. The event bits cannot be cleared until they are read, even if they do
not reflect the current status of a related condition.
Return
Numeric data transferred as ASCII bytes in <NR1> format.
The query response is an integer formed by the binary-weighting of the bits.
The value of unused bit is zero.
Notes
This register is cleared after the counter has been turned off or after *CLS or
*ESR?. Note that the instrument’s power-on sequence initially clears the
register, but then records any subsequence events during the power-on
sequence including setting the Power on bit.
*IDN?
Queries the counter identification.
*OPC
Enables the OPC bit (bit 0) in the Standard Event Status Register to be set upon
the transition if the measurement cycle from measuring to idle.
Note
This event command is “disabled” by *CLS, *RST, Device Clear, after the