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 *ESE *ESE? *OPC

*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>

Field

Information

 

 

Agilent Technologies

Manufacturer

 

 

xxxxxA

model number followed by a letter suffix

 

 

0

zero or the unit’s serial number if available

 

 

<A>.xx.xx

Revision levels of firmware.

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:

υall 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.

υall 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 *TRIG *WAI

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Agilent Technologies D, 66311B, 66309B, 66111A manual Field Information, Example, 136
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66111A, 66309B, 66311B, D specifications

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