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command
syntax
description
example
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HP-IB Programming
IEEE Common Commands
ATTEN TIO N Unused bits in any of the registers return 0 when
you read them.
The Request Service Bit in the Status Byte
A service request (SRQ) occurs when a bit in the Status Byte
register goes from 0 to 1 AND the corresponding bit in the Service
Request Enable Mask is set.
The Request Service (RQS) bit is set to 1 at the same time that the
SRQ is caused. This bit can only be reset by reading it by a serial
poll. The RQS bit is not affected by the condition that caused the
SRQ. The serial poll command transfers the value of the Status
Byte register to a variable.
Command Descriptions
*CLS
*CLS
The CLear Status command *CLS clears the following:
• The error queue
• The standard Event Status Register (ESR)
• The STatus Byte (STB).
Neither the Event Status Enable register, nor the Service Request
Enable register are affected by this command.
After the *CLS command the instrument is left in the idle state. The
command does not alter the instrument setting. *OPC/*OPC?
actions are cancelled.
OUTPUT 724;"*CLS"
109
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