Agilent Technologies 54503A User's Guide download pdf (Page 336)

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336 Chapter5

Programming

Monitoring System Operation

Lines 50 and 60 sends the take-sweep command; during the 10 video

averages that will now occur, the computer remains on line 60. When

the video averaging is complete, TS is complete and the "command

complete" condition is satisﬁed. The computer then branches to the

subroutine Srq.

Lines 70 and 80 causes the computer to read the decimal equivalent of

the generated service request into the variable Sbyte. The computer

then prints the value, alerting you that the interrupt has occurred.

Line 100 returns the status register to its initial state (that is, no

conditions are masked).

Reading Service Request Data

In the above example, you used the serial-poll statement (SPOLL) to

read the service request data into a variable. The STB (status byte

query) command also reads service request data. Example 2 shows how.

XAMPLE 2

10 OUTPUT 718;"IP;SNGLS;CF 300MHZ;SP 20MHZ;TS;"

20 OUTPUT 718;"VAVG 10;RQS 16;"

30 ON INTR 7 GOSUB Srq

40 ENABLE INTR 7;2

50 Done=0

60 OUTPUT 718;"TS;"

70 Idle: IF Done=0 GOTO Idle

80 STOP

90 Srq:OUTPUT 718;"STB?;";

100 ENTER 718;Sbyte

110 PRINT Sbyte

120 PRINT "VIDEO AVERAGING IS COMPLETE"

130 OUTPUT 718;"RQS 0;"

140 Done=1

150 RETURN

160 END

Line 20 sets the bit mask so that only the "command complete"

condition is set. On Line 70, once the "command complete" condition is

satisﬁed (in this case, after ten video averages), the STB command

queries the spectrum analyzer for the service-request data. The data is

then entered into variable Sbyte and printed. The value returned is the

decimal equivalent of the generated service request.

Reading Service Requests From More Than One Instrument

Most instruments that can be controlled remotely have service request

capability similar to that in the 8560 E-Series and EC-Series. You may

want to take advantage of this capability in other instruments as well

as in the spectrum analyzer. If you have more than one instrument on a

bus that can generate a service request, you need to modify the above

program to look for interrupts from more than one instrument.

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