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12 Programming the Status System Chapter 2
The meaning of each bit in the Status Byte is explained in the following
table.
Example commands using the Status Byte and Status Byte enable registers:
*
SRE 16 Generate an SRQ interrupt when messages are available.
*SRE? Find out what events are enabled to generate SRQ
interrupts.
*STB? Read and clear the Status Byte event register.
Standard Event
Group
The Standard Event status group is frequently used and is one of the
simplest. The unique aspect of Standard Event is that you program it using
common commands, while you program all other status groups through the
STATus subsystem. Standard Event consists of only two registers: the
Standard Event event register and the Standard Event enable register. Figure
2-5 illustrates the structure of Standard Event.
Table 2-1. Status Byte Bit Definitions
Bit Name Description
0 Instrument dependent
1 Instrument dependent
2 Instrument dependent
3 QUE Summary bit from Questionable Data
4 MAV Messages available in Output Queue
5 ESB Summary bit from Standard Event
6 RQS Service request
7 OPR Summary bit from Standard Operation
Status
Figure 2-5. Standard Event Status Group