HP VXI manual Standard Event Group, Status Byte Bit Definitions

Standard Event Group

The meaning of each bit in the Status Byte is explained in the following table.

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

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.

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 2-5illustrates the structure of Standard Event.

Figure 2-5. Standard Event Status Group

12 Programming the Status System Chapter 2