BIT 4886 051010
A-3
A.8
*OPC? — OPERATION COMPLETE QUERY
*OPC?
Syntax
:
*OPC?
Return value: <1> (ASCII) placed in output queue when power supply has completed operation.
Description:
Indicates when pending operations have been completed.
When all pending operations are com-
plete (all previous commands have been executed and changes in output level have been completed)
a “1” is placed in the Output Queue. Subsequent commands are inhibited until the pending operations
are completed. *OPC? is intended to be used at the end of a command line so that the application pro-
gram can monitor the bus for data until it receives the “1” from the power supply Output Queue. (See
example, Figure A-1.)
FIGURE A-1. GPIB COMMANDS
*CLS
Power supply clears status data.
*ESE 60
Power supply enables bits 5, 4, 3 and 2, allowing command error, execution
error, device dependent error and query error to set the Event Status
Summary bit when an STB command is executed.
*ESE?
Returns 60, (value of the mask) verifying that bits 5, 4, 3 and 2 are enabled.
*ES
Unknown command will set command error (Bit 5).
*ESR?
Returns 32 (bit 5 set), indicating Command Error has occurred since the last
time the register was read.
*IDN?
Power supply returns: KEPCO, BIT 4886 100-2 123456 1.8-1.8
*OPC
Allows status bit 0 to be set when pending operations complete
VOLT 21;CURR 3
Sets output voltage to 21V, output current to 3A
*ESR?
Returns 129 (128 + 1, power on, bit 7 = 1, operation complete, bit 1 = 1)
*ESR?
Returns 0 (event status register cleared by prior *ESR?)
VOLT 15;CURR 5;*OPC? Sets output voltage to 15V, output current to 5A, puts “1” on output bus when
command operations are complete.
*RST
Power supply reset to power on default state.
*SRE 40
When ESB or QUES bits are set (Table A-3), the Request for Service bit will
be set.
*SRE?
Returns the value of the mask (40).
*STB?
For example, the Power supply responds with 96 (64 + 32) if MSS and the
Event Status Byte (Table A-3) summary bit have been set. The power
supply returns 00 if no bits have been set.
VOLT 25
Power supply voltage commanded to 25V.
VOLT:TRIG 12
Programs power supply voltage to 12V when *TRG received.
INIT
Trigger event is initialized.
*TRG
Power supply reverts to commanded output voltage of 12V.
** LOAD DISCONNECTED
*TST?
Power supply executes self test and responds with 0 if test completed
successfully, with 1 if test failed.
