Kikusui KHA1000, Operation Manual, Page: 245 / 274

KHA1000
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8.8.1 IEEE 488.2 Register Model
Status byte register
The status byte register stores the STB and RQS (MSS) messages as defined in the
IEEE 488.1 standard. The status byte register can be read by using IEEE 488.1
serial polling or IEEE 488.2 common command *STB?.
When serial polling is performed, bit 6 responds with Request Service (RQS). The
status byte value is not changed by serial polling.
*STB? causes the content of the status byte register and Master Status Summary
(MSS) to be sent to equipment.
*STB? does not change the status byte, MSS, or the RQS.
Table 8-6 Status byte register
Bit
Bit
weight
Bit name Description
0 1 Reserved
Reserved for future use by the IEEE 488.
The bit value is posted as zero.
1 2 Reserved
2 4 Error / Event Queue
If data exists in the error or event queue,
this bit is set to “true”.
3 8
Questionable Status
Register (QUES)
This bit is set to “true” when a bit in the
QUEStionable event status register is set
and the corresponding bit in the
QUEStionable status enable register is
“true.”
4 16 Message Available (MAV)
This bit is set to “true” when a request from
the digital programming interface has been
received and the system is ready for data
byte output.
5 32
Standard Event Status Bit
Summary (ESB) This bit is set to “true” when a bit is set in
the event status register.
6 64
Request Service (RQS)
This bit is set to “true” when a bit in the
service request enable register is set and
the bit corresponds to a bit in the status
byte.
The GPIB SRQ line is set.
Master Status Summary
(MSS)
This bit is set when one of the status byte
bits is 1 and the corresponding bit in the
service request enable register is also set
to 1.
7 128
Operation Status Register
(OPER)
This bit is set to “true” when a bit in the
OPERation event status register is set and
the corresponding bit in the OPERation
status enable register is set.
8-15 Not Used —