User`s guide

4-13

Programming

*ESR (Event Status Register)

The *ESR query returns the value of the Standard Event Status Register.

When you read the Event Status Register, the value returned is the total of the

bit weights of all of the bits that are set to one at the time you read the byte.

Table 4-2 shows each bit in the Event Status Register and its bit weight.

Reading the register clears the Event Status Register.

Usage:

GPIB only

Query Syntax:

*ESR?

Returned Format:

Where:

<status> ::= 0 to 255 (integer–NR1 format)

Example: OUTPUT 711;"*ESR?"

ENTER 711;Event

PRINT Event

1 2 NOT USED

01OPC – Operation Complete

Table 4-1. Standard Event Status Enable Register

(High–Enables the ERS bit)

Bit Bit Weight Enables

Table 4-2. Standard Event Status Register

Bit Bit Weight Condition

7 128 PON – Power On

664URQ – User Request

532CME – Command Error