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8.2 Operations
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8.2.7 Status Byte Register
Status byte register bit assignments
Bit 7
Unused
Bit 6
RQS
Set to 1 when a service request is dispatched.
MSS
Logical sum of the other bits of the status byte register
Bit 5
ESB
Standard event summary (logical sum) bit
Shows a logical sum of the standard event status register.
Bit 4
MAV
Message available
Indicates that there is at least one message in the output queue.
Bit 3
Unused
Bit 2
Unused
Bit 1
Unused
Bit 0
ESB0
Event summary bit 0
Bitwise logical sum of event status register 0
Each bit of the status byte is a summary (logical OR) of the event register
corresponding to that bit. Further, the status byte and each event register has
an enable register corresponding to it, and according to the setting of this
enable register (which starts off at zero when the power is turned on) it is
possible to mask the service requests originating from each event.
The following commands are used for reading the status byte, and for setting
the service request enable register and for reading it.
Reading the status byte
*STB?
Setting the service request enable register
*SRE
Reading the service request enable register
*SRE?
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