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Remote Control

The individual bits of the Service Request Enable Register can be set or

cleared by using the following common command:

*SRE <NRf>

To read the Service Request Enable Register, use the *SRE? query command.

The Service Request Enable Register clears when power is cycled or a

parameter (n) value of zero is sent with the *SRE command *SRE 0.

1.8 Serial poll and SRQ

Any enabled event summary bit that goes from 0 to 1 will set RQS and generate

a service request (SRQ). In your test program, you can periodically read the

Status Byte Register to check if a service request (SRQ) has occurred and what

caused it. If an SRQ occurs, the program can, for example, branch to an

appropriate subroutine that will service the request. Typically, service requests

(SRQs) are managed by the serial poll sequence of the electronic load. If an

SRQ does not occur, bit B6 (RQS) of the Status Byte Register will remain

cleared and the program will simply proceed normally after the serial poll is

performed. If an SRQ does occur, bit B6 of the Status Byte Register will set and

the program can branch to a service subroutine when the SRQ is detected by

the serial poll.

The serial poll automatically resets RQS of the Status Byte Register. This

allows subsequent serial polls to monitor bit B6 for an SRQ occurrence

generated by other event types. After a serial poll, the same event can cause

another SRQ, even if the event register that caused the first SRQ has not been

cleared.

A serial poll clears RQS but does not clear MSS. The MSS bit stays set until all

Status Byte event summary bits are cleared.

1.9 Trigger model (GPIB operation)

This section describes how the electronic load operates over the GPIB bus.

The flowchart in figure below summarizes operation over the bus and is called

the trigger model. It is called the trigger model because operation is controlled

by SCPI commands from the Trigger subsystem. Key SCPI commands are

included in the trigger model.

ITech IT8731 Programming Guide

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