Status Byte; Table 4.11 Status Byte Summary Register - Xantrex GPIB-M-HPD Operating Manual

Status Byte The Status byte register contains the STB and RQS(MSS) messages as defined in
488.1. The user can read the status byte register using a 488.1 serial poll or the 488.2
*STB? common command. If the user sends a serial poll, bit 6 will respond with
Request Service (RSQ). The value of the status byte is not altered by a serial poll.
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.

Table 4.11 Status Byte Summary Register

Bit
Release 2.1
Bit Weight
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
Bit Name Description
Reserved
Reserved
Error/Event Set if any errors are present in
Queue (ERR) the Error/Event queue.
Questionable Set if any bits are set in the
Status Register Questionable Status Event
(QSR) register and the corresponding
bit then the Questionable
Status Enable register is TRUE.
Message MAV is TRUE if the power
Available (MAV) supply is ready to accept a
request from the controller to
output data. FALSE when the
output queue is empty.
Standard Event A summary of the Standard
Status Bit Event Status Register. TRUE
Summary (ESB) with a bit is set in the Standard
Event Status register.
Request Service MSS indicates that the device
(RQS) has at least one reason for
Master Status requesting service.
Summary (MSS)
Operation Status TRUE if a bit is set in the
Register (OSR) Operation status register and
the corresponding bit in the
Operation Status Enable
register is set.
Status Registers
Overview
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