Model 6485 Picoammeter Instruction Manual Common Commands 11-3
A) 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 6485, xxxxxxx, yyyyy/zzzzz/w
Where: xxxxxxx is the serial number.
yyyyy/zzzzz is the firmware revision levels of the digital board ROM and
display board ROM. Note that yyyyy also provides build date and time
information. w is the board revision level.
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
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, 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.
Programming example — The following command sequence will perform 10 measure-
ments. After the measurements are completed (in approximately 10 seconds), an ASCII
“1” will be placed in the output queue.
*RST ' Return 6485 to RST defaults (idle).
TRIG:DEL 1 ' Set trigger delay for 1 second.
ARM:COUN 10 ' Program for 5 measurements and stop.
INIT ' Start measurements.
*OPC? ' Send *OPC?.
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