Operation Manual

Model 2750 Multimeter/Switch System User’s Manual Common Commands 12-3
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 2750, xxxxxxx, yyyyy/zzz
Where: xxxxxxx is the serial number.
yyyyy/zzzzz is the firmware revision levels of the digital board ROM and
display board ROM.
B *OPC — operation complete Sets the OPC bit in the standard event register
after all pending commands are complete
Description
After the *OPC command is sent, the Operation Complete bit (bit B0) of the Standard
Event Status Register will set immediately after the last pending command is completed.
If the corresponding bit (Bit B0) in the Standard Event Enable Register and Bit 5 (Event
Summary Bit) of the Service Request Enable Register is set, the RQS/MSS (Request for
Service/Master Summary Status) bit in the Status Byte Register will set.
When used with the immediate initiation command (:INITiate), the OPC bit in the Standard
Event Status Register will not set until the Model 2750 goes back into the idle state. The
:INIT command operation is not considered finished until the Model 2750 goes back into
the idle state. See the description for *WAI for more information on command execution.
Programing example – The first group of commands program send the *OPC command
after the :INITiate command and verifies that the OPC bit in the Standard Event Status
Register does not set while the instrument continues to make measurements (not in idle).
The second group of commands return the Model 2750 to the idle state and verifies that
the OPC bit did set.
SYST:PRES ‘ Returns 2750 to default setup.
INIT:CONT OFF ‘ Disables continuous initiation.
ABORt ‘ Aborts operation. Places 2750 in idle.
INIT:IMM ‘ Initiate one trigger cycle.
*OPC ‘ Sends the OPC command.
*ESR? ‘ Reads the Standard Event Status Register.
After addressing the Model 2750 to talk, the returned value of 0 denotes that the bit (bit 0)
is not set indicating that the :INITiate operation is not complete.
ABORt ‘ Aborts operation. Places 2750 in idle.
*ESR? ‘ Reads the Standard Event Status Register.
After addressing the Model 2750 to talk, the returned value of 1 denotes that the bit (bit 1)
is set indicating that the :INITiate operation is now complete.
SYST:PRES ‘ Returns 2750 to default setup.
2750-900-01.book Page 3 Wednesday, August 3, 2011 7:56 AM