Agilent Technologies 54503A User's Guide download pdf (Page 332)

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332 Chapter5

Programming

Monitoring System Operation

The programming techniques discussed so far describe communication

between the analyzer and the computer, where the sequence of all data

transfer is controlled by a computer program. This section describes

how the analyzer can interrupt computer operation when the analyzer

has attained a particular state.

The interrupting process is called a service request. Service requests

have many applications. They facilitate economical use of

computer-processing time when the analyzer is part of a large

measurement system. For example, after the computer initiates an

analyzer measurement, the computer can make calculations or control

other devices via GPIB while the analyzer is measuring. When the

analyzer is through, it signals the computer with a service request. The

computer service-request subprogram then determines what the

computer will do next. Service requests can also be used to report

analyzer errors and other analyzer events, such as end-of-sweep.

Interrupt Process

The interrupt process begins when the analyzer "requests" attention by

setting the GPIB service-request line (SRQ) true. The computer must

be programmed to respond to this event. Typically, the computer is

programmed to interrupt normal program execution and call a

user-speciﬁed subroutine when the service request occurs. If multiple

instruments are being controlled remotely, this subroutine determines

which instrument or instruments on GPIB caused the service request.

Then, it may be necessary to call another subroutine that determines

why a particular instrument requested service (because there can be

more than one possible cause). Finally, one or more subroutines will be

called to respond to the indicated events. Note that more than one

instrument can request service simultaneously, and each instrument

can have more than one event to report. These steps are summarized

below.

1. Computer monitors GPIB service request line (SRQ).

2. Analyzer requests service by setting the SRQ line true.

3. Computer branches to routine that determines the instrument or

instruments that caused the SRQ.

4. Computer branches to routine that determines why a particular

instrument is requesting service.

5. Computer branches to routine to process a speciﬁc event in a

particular instrument.

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