14.2 IEEE488.2 Common Commands.
The mnemonic common commands have three letters and begin with a star, the query commands are
followed by a question mark (?). Common commands are defined by the IEEE STD 488.2-1987 standard
and control status reporting, synchronization, power-on conditions and stored operating parameters of
the PSC-488.
The PSC-488 contains the following common commands.
MNEMONICS Description
Only PSC-488
*IDN?
Identification query.
*RST
Device Reset command.
*TST?
Self test query.
*OPC
Operation complete command.
•
*OPC?
Operation complete query.
•
*WAI
Wait to continue command.
•
*CLS
Clear status command.
•
*ESE
Standard event status enable command.
•
*ESE?
Standard event status enable query.
•
*ESR?
Standard event status register query.
•
*SRE
Service request enable command.
•
*SRE?
Service request enable query.
•
*STB?
Read status byte query.
•
*SAV
Save calibration values to non-volatile memory.
*RCL
Recall values from non-volatile memory.
14.2.1 Status reporting
The status structure of the PSC-488 is used to reflect the power supply condition and to report all kind of
events that have happened. The various status models are ultimately reported in the Status Byte
Register, giving a complete organized status of the power supply. Status model, registers and queues
are reported in one of the summary bits of the Status Byte Register. The Service Request Enable
Register selects which Status Byte bits will cause a Service Request (SRQ) on the GPIB.
From the Status Byte Register, which is returned as response to a serial poll from a controller, it is
always possible to trace back the event that caused the corresponding summary bit to be set.
The diagram shows the interrelations.
14.2.2 *SRE
The Service Request Enable Command specifies the bit values of the Service Request Enable Register.
This register determines which conditions from the Status Byte Register will cause a Service Request
(SRQ) are summarized in the Master Summary Status -MSS- of the Status Byte Register.
A bit value 1 in the Service Request Enable Register selects the corresponding Status Byte Register
condition. The bit value of bit 6 (RQS/MSS) is ignored. The command parameter is specified as a
decimal using the <Nrf> format; when rounded to an integer value and expressed base 2 (binary),
the parameter represents the bit value of the Standard Event status Enable Register. Alternatively, the
command parameter may use a non-decimal numeric format (hexadecimal, octal or binary) to express
the register’s bit setting.
*SRE?
The Service Request Enable Query returns a decimal value, which expressed in base 2, reflects the bit
values of the Service Request Enable Register. Bit 6 is always set to 0.
page 17 MANUAL May 2008
DELTA ELEKTRONIKA BV PSC SERIES
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