Quantum Data 801GC, 801GF, 801GX Owner's And Programmer's Manual page 194

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Chapter 6: Programming
Status Byte Bit Definitions
Message available. Indicates that at least one
MAV
complete response is present in the output
buffer.
Event status bit. Indicates that one of the
ESB
enabled conditions in the Standard Event
Status register is set.
Master summary status. Indicates that the
MSS
801GX has a reason for requesting service.
Request service. This bit is read only by
RQS
executing a serial poll of the 801GX.
Event Status Bit Definitions
Operation complete. Indicates that all
OPC
operations have been completed.
Request control. Indicates that a device is
RQC
requesting control. The 801GX will never
request control, so this bit will always be 0.
Query error. Indicates that a query request
QYE
was made while the 801GX was in deadlock.
Device dependent error. Indicates that the
DDE
801GX encountered an error executing a
command.
Execution error. Indicates that there was an
EXE
error parsing a parameter.
Command error. Indicates that there was an
CME
unrecognizable command.
User request. Indicates that a front panel
URQ
button has been pressed or that the front
panel knob has been turned.
Power on. Indicates that power has been
PON
turned off-and-on. This bit will always be 0
in the 801GX.
Model 801GC, 801GF & 801GX¥Rev. A