2400 Series SourceMeter
®
User’s Manual Common Commands 16-3
Command reference
*IDN? — identification query
The identification code includes the manufacturer, model number, serial number, and firm-
ware revision levels and is sent in the following format:
KEITHLEY INSTRUMENTS INC., MODEL nnnn, xxxxxxx, yyyyy/zzzzz /a/d
Where: nnnn is the model number.
xxxxxxx is the serial number.
yyyyy/zzzzz is the firmware revision level of the digital board ROM and display
board ROM, including date and time of build.
a is the analog board revision level.
d is the digital board revision level.
*OPC — operation complete
*OPC? — operation complete query
When *OPC is sent, the OPC bit in the Standard Event Register will set after all pending
command 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 commands is sent after the INITiate command. The INITiate
command is used to take the instrument out of idle in order to perform measurements.
While operating within the trigger model layers, all sent commands (except DCL, SDC,
IFC, SYSTem:PRESet, *RST, *RCL, *TRG, GET, and ABORt) will not execute.
After all programmed operations are completed, the instrument returns to the idle state at
which time all pending commands (including *OPC and/or *OPC?) are executed. After
the last pending command is executed, the OPC bit and/or an ASCII “1” is placed in the
Output Queue.
Reads identification code
Sets OPC bit
Places a “1” in output queue
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