The Status Byte Status Group

The Status Byte Register

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 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).

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

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

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Image 172
HP E1429A manual Status Byte Status Group, Status Byte Register, Oper RQS ESB MAV Ques