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The Status Byte
Status Group
The registers in the Status Byte Status Group enable conditions monitored
by the other status groups to generate a service request.
The Status Byte
Register
The Status Byte register contains the summary bits of the Questionable
Signal Status Group (QUES), the Operation Status Group (OPER), and the
Standard Event Status Group (ESB). The register also contains the message
available bit (MAV) and the service request bit (RQS).
76543210
OPER RQS ESB MAV QUES unused
Questionable Signal Summary Bit (QUES): Bit 3 is set (1) when a
condition monitored by the Questionable Signal Status Group is present,
when the appropriate bit is latched into the group’s Event register, and when
the bit is unmasked by the group’s Enable register.
Message Available Bit (MAV): Bit 4 is set (1) when data, such as a query
response, is in the digitizer’s output queue.
Standard Event Summary Bit (ESB): Bit 5 is set (1) when a condition
monitored by the Standard Event Status Group is present and the
appropriate bit is set in the group’s Event register, and when the bit is
unmasked by the group’s Enable register.
Service Request Bit (RQS): Bit 6 is set (1) when any other bit in the Status
Byte register is set.
Operation Status Summary Bit (OPER): Bit 7 is set (1) when a condition
monitored by the Operation Status Group is present, when the appropriate
bit is latched into the group’s Event register, and when the bit is unmasked
by the group’s Enable register.
172 Understanding the HP E1429 Digitizer Chapter 3