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Chapter 5, Advanced Operations
GPIB Service Requests
GPIB 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
interrupts.
This section describes the steps necessary to properly configure the Test Set to
request service using the Service Request (SRQ) function.