Agilent Technologies 54503A User's Guide download pdf (Page 329)

100

101

Chapter 5 329

Programming

Generating Plots and Prints Remotely

Line 10 queries the plotter for its P1 and P2 coordinates.

Line 20 enters the P1 and P2 coordinate values into variables.

Line 30 sends the spectrum analyzer PLOT command and the plotter

coordinates.

Line 40 sends the following statements over the GPIB interface: UNL

sets all instruments on the GPIB to unlisten mode; LISTEN 5 sets only

the plotter to listen mode; TALK 18 speciﬁes the spectrum analyzer as

the talker, which can then send its display contents to the plotter.

Because the controller GPIB interface must not interfere with the plot,

the DATA statement puts the controller GPIB interface on standby and

sets the attention line low. Example 1 illustrates the statements

required to generate a plot. However, there is no provision to indicate to

the controller when the plot is ﬁnished. Example 2 uses a spectrum

analyzer "command complete" service request to indicate when the plot

is done. (Service requests are discussed later in this chapter.) When the

spectrum analyzer PLOT command is ﬁnished, a "command complete"

service request is triggered and signals that the plot is done. E

XAMPLE 2

10 OUTPUT 705;"OP;"

20 ENTER 705;P1x,P1y,P2x,P2y

30 ON INTR 7 GOTO Done

40 ENABLE INTR 7;2

50 OUTPUT 718;"RQS 16;"

60 OUTPUT 718;"PLOT ";P1x;",";P1y;",";P2x;",";P2y;";"

70 SEND 7;UNL LISTEN 5 TALK 18 DATA

80 Idle: GOTO Idle

90 Done: S_poll=SPOLL(718)

100 OUTPUT 718;"RQS 0;"

110 PRINT "COMMAND IS COMPLETE"

120 END

Lines 10 and 20 obtain the P1 and P2 coordinates, as in the previous

example.

Line 30 commands the controller to go to the subroutine Done when an

interrupt occurs.

Line 40 enables the controller to receive service request interrupts.

Line 50 The RQS command speciﬁes that a "command complete"

condition will generate a service request.

Lines 60 and 70 plot the display contents.

Line 80 keeps the controller on Line 80 of the program until the plot is

ﬁnished and the PLOT command satisﬁes the "command complete"

condition. When the plot is ﬁnished, the controller continues to the

subroutine Done. Done performs a serial poll on the spectrum analyzer

and reads the generated service request. This also clears the analyzer

of this request.

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