HP 53150A Series Programming Manual page 67

Chapter 3 Programming Your Counter for Remote Operation
Status Reporting
Status Byte Register and
Service Request Enable Register
Error/Event
Queue
Questionable
Data
Status Register
Group
Status of
Output Queue
Standard Event
Status Register
Group
Operation Status
Register Group
Figure 3-11. Status Byte and Service Request Enable
Status Byte Register
The Status Byte Register is the summary-level register in the status
reporting structure. It contains summary bits that monitor activity in the
other status registers and queues as shown in Figure 3-11. The Status
Byte Register is a live register—its summary bits are set TRUE or FALSE
(one or zero) by the presence or absence of the condition which is being
summarized.
The Status Byte Register can be read with either a serial poll or the *STB?
query, but it is altered only when the state of the overlying status data
structures is altered. The entire Status Byte Register can be cleared by
sending just the *CLS command to the Counter in a program message.
Table 3-4 lists the Status Byte Register bits and briefly describes each bit.
Programming Guide
Status Byte
Register
0 &
1 &
EAV
&
QSB
MAV
ESB
RQS /MSS
OSB
Service
Request
Generation
Service Request
Enable Register
(Logical AND)
0
1
2
& 3
& 4
5
&
7
&
Logical OR
SRQ Interrupt
to Computer
3-27