43
7.8.5. Read the Status Byte Register
The Status Byte register is a summary of all events that have been enabled. Figure 6 shows
the commands that are used to enable events. The Status Byte is a condition register, that
is, reading it will not clear the contents. To clear the Status Byte register, the connected
event registers must be read or cleared
These are the bit assignments of the Status Byte:
BIT VALUE SYMBOL DESCRIPTION
0 1 0 Not Used
1 2 0 Not Used
2 4 SYS System Error, at least one error in error queue
3 8 QUE Questionable Summary
4 16 0 Not Used
5 32 ESB Standard Event Summary
6 64 MSS
Master Summary Status, is set if any other bit is
set in this register
7 128 OPR Operational Summary
Syntax: *STB?
Response: <nnn>, a number from 0 to 255
Example: 12 (a supply fault had occurred and there is some error which may be
read using the SYSTEM:ERROR? query)
7.8.6. Set the Service Request Enable Register
The IEEE-488.2 and SCPI specifications defined this register so instruments may generate
a service request when selected events occur
The Genesys™ power supply LAN option does not support the service request feature,
although the *SRE command will set bit 6 in the Status Byte
Syntax: *SRE <nnn>
Parameter: <nnn> is a number from 0 to 255. The bit assignments are the
same as the Status Byte, in the table above
Example: *SRE 255 will cause Status Byte bit 6 to be set if any other bit is set
Query: *SRE? will return 172 in the example
(bits 0,1,4 and 6 are not settable in the *SRE register)
7.8.7. Read the Standard Event Status Event Register
This is a basic status and fault register that was first defined in IEEE-488.2. It is an event
register, which means bits are set to “1” when a condition occurs and they are not cleared
until the register value is read using the *ESR? query or the *CLS command
These are the bit assignments of the ESR register:
BIT VALUE SYMBOL DESCRIPTION
0 1 OPC Operation complete. See section 7.8.9
1 2 0 Not used
2 4 QYE Query error (response not read)
3 8 DDE Device dependant error (fault shut-down)
4 16 EXE Execution error (could not execute command)
5 32 CME Command error (invalid command received)
6 64 0 Not used
7 128 PON Power On. Set once when power is switched on.
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