Hp-Ib Service Requests - HP 8920A Programmer's Manual

Rf communications test set

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Chapter 5, Advanced Operations

HP-IB Service Requests

The Test Set is capable of generating a "service request" when it requires the

Active Controller to take action. Service requests are generally made after the

Test Set has completed a task (such as making a measurement) or when an error

condition exists (such as an internal self-calibration has failed).

The mechanism by which the Active Controller detects these requests is the SRQ

interrupt. Interrupts allow for efficient use of system resources, because the

Active Controller may be executing a program until an SRQ interrupt occurs. If

SRQ interrupts are enabled in the Active Controller, the occurrence of an interrupt

can initiate a program branch to a routine which "services" the interrupt (executes

some remedial action). The operating and/or programming manuals for each

controller describe the controller's capability to set up and respond to SRQ

This section describes the steps necessary to properly configure the Test Set to

request service using the Service Request (SRQ) function.