Esr; Idn; Opc - Agilent Technologies 66111A User Manual

8 – Language Dictionary

*ESR?

This query reads the Standard Event Status Event register. Reading the register clears it. The bit
configuration is the same as the Standard Event Status Enable register (see *ESE).
Query Syntax *ESR?
Parameters None
Returned Parameters <NR1>(Register binary value)
Related Commands *CLS

*IDN?

This query requests the dc source to identify itself. It returns a string composed of four fields separated
by commas.
Query Syntax *IDN?
Returned Parameters <AARD>
Example AGILENT,66312A,0,A.00.01

*OPC

This command causes the instrument to set the OPC bit (bit 0) of the Standard Event Status register when
the dc source has completed all pending operations. (See *ESE for the bit configuration of the Standard
Event Status register.) Pending operations are complete when:
u all commands sent before *OPC have been executed. This includes overlapped commands. Most
commands are sequential and are completed before the next command is executed. Overlapped
commands are executed in parallel with other commands. Commands that affect output voltage,
current or state, relays, and trigger actions are overlapped with subsequent commands sent to the dc
source. The *OPC command provides notification that all overlapped commands have been
completed.
u all triggered actions are completed
*OPC does not prevent processing of subsequent commands, but bit 0 will not be set until all pending
operations are completed.
*OPC? causes the instrument to place an ASCII "1" in the Output Queue when all pending operations are
completed. Unlike *OPC, *OPC? prevents processing of all subsequent commands. It is intended to be
used at the end of a command line so that the application program can then monitor the bus for data until
it receives the "1" from the dc source Output Queue.
Command Syntax *OPC
Parameters None
Query Syntax *OPC?
Returned Parameters <NR1> 1
Related Commands *OPC
136
*ESE *ESE? *OPC
Field
Agilent Technologies
xxxxxA
0
<A>.xx.xx
*TRIG *WAI
Information
Manufacturer
model number followed by a letter suffix
zero or the unit's serial number if available
Revision levels of firmware.