Common Commands 8-3
A. *IDN? — identification query Reads identification code
The identification code includes the manufacturer, model number, serial number, and firm-
ware revision levels. Identification codes vary with the model number, output formats and output
types. Power supplies set for the exponential output format and Keithley output types have the
following codes:
KEITHLEY INSTRUMENTS INC., MODEL 2303, xxxxxxx, yyyyy/zzzzz
KEITHLEY INSTRUMENTS INC., MODEL 2303B, xxxxxxx, yyyyy/zzzzz
KEITHLEY INSTRUMENTS INC., MODEL 2303-PJ, xxxxxxx, yyyyy/zzzzz
Where: xxxxxxx is the serial number.
yyyyy/zzzzz is the firmware revision levels of the digital board and display board
ROMs.
Power supplies set for the decimal output format and Keithley output type have the following
codes:
KI, 2303,0,yyyyy/zzzzz
KI, 2303B,0,yyyyy/zzzzz
KI, 2303-PJ,0,yyyyy/zzzzz
For the Fluke output type, regardless of the output format, the code is:
FLUKE,PM2832/11,0,V1.0
B. *OPC — operation complete Sets OPC bit
*OPC? — operation complete query
Places a “1” in output queue
When *OPC is sent, the OPC bit in the standard event register will set after all pending com-
mand operations are complete. When *OPC? is sent, an ASCII “1” is placed in the output queue
after all pending command operations are complete.
Typically, either one of these command is sent after a reading or reading array is requested.
While the instrument is acquiring readings, all commands (except DCL, SDC, IFC, *TRG and
GET) that are sent are not executed.
After all readings are acquired, the instrument returns to the idle at which time all pending
commands (including *OPC and/or *OPC?) are executed.
Syntax — The following syntax rules explain how to use *OPC and *OPC? with other com-
mands (refer to Table 8-2 for examples):
Send *OPC or *OPC?, separated by a semicolon, on the same line with a query (see A exam-
ples in Table 8-2). If sent on separate lines, an error occurs (B). *OPC or *OPC? can be sent on
the same line or a separate line with a command that is not a query (C and D).
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