30 Language Dictionary
If *PSC is programmed to 0, then the *SRE command causes a write cycle to nonvolatile memory.
The nonvolatile memory has a finite number of write cycles (see Table 1-2 in the power module
User’s Guide). Programs that repeatedly write to nonvolatile memory can eventually exceed the
maximum number of write cycles and may cause the memory to fail.
*STB?
Meaning and Type
Status Byte Device Status
Description
This query reads the Status Byte register, which contains the status summary bits and the Output Queue MAV bit. Reading
the Status Byte register does not clear it. The input summary bits are cleared when the appropriate event registers are read
(see “Chapter 4 - Status Reporting”) for more information). The MAV bit is cleared at power on or by *CLS.
A serial poll also returns the value of the Status Byte register, except that bit 6 returns Request for Service (RQS) instead of
Master Status Summary (MSS). A serial poll clears RQS, but not MSS. When MSS is set, it indicates that the power
module has one or more reasons for requesting service.
Bit Configuration of Status Byte Register
Bit Position 76543210
Condition OPER MSS ESB MAV QUES 22 2
(RQS)
Bit Weight 128 64 32 16 8 4 2 1
ESB = Event status byte summary; M = Message available
MSS = Master status summary; OPER = Operation status summary;
QUES = Questionable status summary; RQS = Request for service
1Also represents RQS. 2These bits are always zero.
Query Syntax *STB?
Returned Parameters <NR1> (Register binary value)
Related Commands (None)
*TRG
Meaning and Type
Trigger Device Trigger
Description
This command generates a trigger to any subsystem that has BUS selected as its source (for example, TRIG:SOUR BUS,
OUTP:TTLT:SOUR BUS). The command has the same affect as the Group Execute Trigger (<GET>) command.
Command Syntax *TRG
Parameters (None)
Query Syntax (None)
Related Commands ABOR CURR:TRIG INIT TRIG[:IMM] VOLT:TIUG