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28 Language Dictionary
*ESR?
Meaning and Type
Event Status Register Device Status
Description
This query reads the Standard Event Status Event register. Reading the register clears it. The bit configuration of this
register is the same as the Standard Event Status Enable register (*ESE). See "Chapter 4 - Status Reporting" for a detailed
explanation of this register.
Query Syntax *ESR?
Parameters (None)
Returned Parameters <NR1> (Register binary value)
Related Commands *CLS *ESE *ESE? *OPC
*IDN?
Meaning and Type
Identification System Interface
Description
This query requests the power supply to identify itself. It returns a string composed of four fields separated by commas.
Query Syntax *IDN?
Returned Parameters <AARD>
Field Information
Hewlett-Packard Manufacturer
xxxxA 4-digit model number followed by a letter
nnnnA-nnnnn 10-character serial number or 0
<R>.xx.xx Revision levels of firmware
Example Hewlett-Packard,6681,0,A.00.01
Related Commands (None)
*OPC
Meaning and Type
Operation Complete Device Status
Description
This command causes the interface to set the OPC bit (bit 0) of the Standard Event Status register when the power supply
has completed all pending operations. (See *ESE for the bit configuration of the Standard Event Status register.) Pending
operations are complete when:
• 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 power supply. The *OPC command provides notification that
all overlapped commands have been completed.
• Any change in the output level caused by previous commands has been completed (completion of settling
time, relay bounce, etc.)
• 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.
Command Syntax *OPC
Parameters (None)
Related Commands *OPC? *WAI