Remote Operation
5-28 M370046-01
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.
416 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.
532 Standard Event Status
Bit Summary (ESB)
A summary of the Standard Event Status Register.
664 Request Service (RQS) /
Master Status Summary
(MSS)
Not Implemented / MSS indicates that the device has at
least one reason for requesting service.
7128 Operation Status
Register (OSR)
Present if a bit is set in the Operation status register.