Models 2500 and 2502 User’s Manual Common Commands 15-3
Command reference
*IDN? — identification query Reads identification code
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 2500, xxxxxxx, yyyyy/zzzzz /a/d
Where: xxxxxxx is the serial number.
yyyyy/zzzzz is the firmware revision levels 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 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
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.
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