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Chapter 5, Advanced Operations
Status Reporting
Status Byte Register
NOTE:
Read by Serial Poll
Read by
STB?
Figure 4
Status Byte Register
246
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
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.
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.
Call Processing Status Register Group
Operation Status Register Group
Request Service Message
Standard Event Status Register
Output Queue
RQS
ESB MAV
7
6
5
4
MSS
Master Summary Status Message
ch4drw2.ds4
. If the Summary Message from a
figure 4
Communicate Status Register Group
Calibration Status Register Group
Questionable Data/Signal Register Group
Unused in HP 8920
Hardware Status Register #2 Group
Hardware Status Register #1 Group
Status Byte Register
3
2
1
0
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