Remote Operation
Series 2268 850 Watt DC Power Supplies Reference Manual
128
2268S-901-01 Rev. A / January 2015
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.
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.
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.
Summary of Contents for Keithley 2268 Series
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