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