IEEE-488 Common Commands
IEEE-488 Common commands generally control overall instrument functions, such as reset, status,
and synchronization. All common commands consist of a three-letter mnemonic preceded by an
asterisk: *RST *IDN? *SRE 8.
*CLS
Clear status command. Clear Status Command. Clears the event registers in all register groups. Also
clears the status byte and error queue. If *CLS immediately follows a program message terminator
(<NL>), then the output queue and the MAV bit are also cleared. Refer to Status Tutorial for more
information.
Parameter Typical Return
(none) (none)
Clear event registers, status byte, and error queue: *CLS
*ESE <value>
*ESE?
Event status enable command and query. Sets the value in the enable register for the Standard Event
Status group. Each set bit of the register enables a corresponding event. All enabled events are
logically ORed into the ESB bit of the status byte. The query reads the enable register. Refer to Status
Tutorial for more information.
Parameter Typical Return
A decimal value corresponding to the binary-weighted
sum of the register's bits.
<bitvalue>
Enable bits 3 and 4 in the enable register: *ESE 24
l The value returned is the binary-weighted sum of all enabled bits in the register. For example, with
bit 2 (value 4) and bit 4 (value 16) set, the query returns +20.
l Any or all conditions can be reported to the ESB bit through the enable register. To set the enable
register mask, write a decimal value to the register using *ESE.
l *CLS does not clear the enable register, but does clear the event register.
*ESR?
Event status event query. Reads and clears the event register for the Standard Event Status group.
The event register is a read-only register, which latches all standard events. Refer to Status Tutorial
for more information.
5 SCPI Programming Reference
196 Keysight RP7900 Series Operating and Service Guide
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