Remote Operation
5-28
M370078-01
Status Byte
The Status byte register contains the STB and RQS (MSS) messages as
defined in 488.1. You can read the status byte register using a 488.1 serial
poll or the 488.2
*STB?
common command.
The
*STB?
query causes the device to send the contents of the Status
Byte Register and the Master Summary Status (MSS) summary message.
The
*STB?
query does not alter the status byte, MSS, or RQS.
Error/Event Queue (ERR)
This bit is TRUE if any errors are present in the Error/Event Queue.
Questionable Status Register Summary (QSR)
This bit is TRUE when a bit in the Questionable Event Status Register is
set and its corresponding bit in the Questionable Status Enable Register is
TRUE.
Table 5-9
Status Byte Summary Register
Bit
Bit
Weight
Bit Name
Description
0
1
Reserved
Reserved
1
2
Reserved
Reserved
2
4
Error/Event Queue
(ERR)
Set if any errors are present in the Error/Event queue.
3
8
Questionable Status
Register (QSR)
Set if any bits are set in the Questionable Status Event
register.
4
16
Message Available
(MAV)
Indicates whether the output queue is empty. MAV is
TRUE if the device is ready to accept a request from the
controller.
5
32
Standard Event Status
Bit Summary (ESB)
A summary of the Standard Event Status Register.
6
64
Request Service (RQS) /
Master Status Summary
(MSS)
Not Implemented / MSS indicates that the device has at
least one reason for requesting service.
7
128
Operation Status
Register (OSR)
Present if a bit is set in the Operation status register.
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