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Chapter 5, Advanced Operations
Status Reporting
Status Byte Register
The Status Byte Register is an 8-bit register that is used to summarize the
Summary Messages from all the register groups in the Test Set, and the Request
Service (RQS) or Master Summary Status (MSS) messages. The contents of the
Status Byte Register, referred to as the status byte, can be read by the Active
Controller to determine the condition of each of the register groups. The Summary
Message from each register group is assigned to a specific bit position in the
Status Byte Register as shown in
Figure 4. If the Summary Message from a
particular register group is TRUE, logic 1, its assigned bit in the Status Byte
Register will also be TRUE. If the Summary Bit from a particular register group is
FALSE, logic 0, its assigned bit in the Status Byte Register will also be FALSE.
NOTE: A Status Register Group Summary Message Bit may be summarized indirectly to the
Status Byte Register through a Status Register Group which is summarized directly into the
Status Byte Register.