Agilent Technologies 8960 Series Reference Manual page 178

Status Subsystem Overview
Service Request Enabling Register Model
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Status Bye Register The Status Byte Register is an 8 bit register that provides single bit summary
messages, each summary message summarizes and overlaying status data structure. Summary messages
always track the current status of the associated status data structure. Service request enabling determines if
one or more of the summary messages will generate a message. Device status reporting is defined in IEEE
488.2-1992, 11.1.
The Status Byte Register contains the STB and RQS (or MSS) messages from the test set. The Status Bute
Register can be read with either a serial poll or the *STB? common query. The value for bit 6 is dependent on
which method used.
When reading with a serial poll the status byte and the RQS message are returned as a single data byte. The
RQS message indicates if the SRQ is TRUE. The Status Byte Register is not affected by a serial poll, the RQS
is set to FALSE when polled.
The *STB? query allows you to read the status byte and the MSS. The response represents the sum of the
binary weighted values of the Status Byte Register from bit 0-5 and 7.
The Master Summary Status (MSS) message from bit 6 indicates when there is at least one reason for
requesting service.
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