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See Example 3.
E
3
XAMPLE
10
OUTPUT 718;"IP;SNGLS;CF 300MHZ;SP 20MHZ;TS;"
20
OUTPUT 718;"VAVG 10;RQS 16;"
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ON INTR 7 GOSUB Srq
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ENABLE INTR 7;2
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Done=0
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OUTPUT 718;"TS;"
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Idle:
IF Done=0 GOTO Idle
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STOP
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Srq:
Sbyte_1=SPOLL(718)
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Sbyte_2=SPOLL(705)
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IF BIT (Sbyte_1,6)=1 THEN
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PRINT "SERVICE REQUEST",Sbyte_1,"ON ADDRESS 18
"
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OUTPUT 718;"RQS 0;"
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STOP
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END IF
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IF BIT(Sbyte_2,6)=1 THEN
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PRINT "SERVICE REQUEST",Sbyte_2,"ON ADDRESS 5"
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END IF
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ENABLE INTR 7;2
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Done=1
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RETURN
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END
In this example, you execute the SPOLL command for each instrument
that can cause a service request interrupt; in this case, the analyzer or
an instrument that is set to address 5. Once the instruments are
queried for interrupts, the IF...THEN statements provide a way to
branch to the appropriate routine.
Testing Service Request Routines
In the previous programming examples, you knew that a service
request would be generated when the VAVG command was completed.
You could easily test the program and make sure that it worked.
However, service requests may not always be so predictable; this can
make a program difficult to test. The spectrum analyzer SRQ command
automatically triggers any service request you choose. Of course, as
with other service requests, you must set the bit mask before executing
the SRQ command. See Example 4.
Chapter 5
Programming
Monitoring System Operation
337
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