Agilent Technologies 54503A User's Guide download pdf (Page 314)

100

101

314 Chapter5

Programming

Data Transfer to Computer

Example 10 uses the I-block format to separate the # and I characters

from the trace data.

EXAMPLE 10

10 INTEGER Tra_binary(1:601)

20 DIM Header$[2]

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

40 CALL Get_settings(Fa,Fb,Rl,Rb,Vb,St,Lg,Aunits$)

50 OUTPUT 718;"TDF I;TRA?;"

60 ENTER 718 USING "#,2A,601(W)";Header$,Tra_binary(*)

70 END

Like the examples for the A-block format, you store format information

in a string (Header$) and store the desired trace data in an integer

array (Tra_binary).

Returning the trace data to the analyzer requires an important

instruction. The "I" in the term I-block refers to the ability of the

spectrum analyzer to accept data of "indeﬁnite" length when using

I-block format. Even though the analyzer uses only 601 points of trace

data, the I-block format lets you send any number of data points. The

spectrum analyzer will continue to accept data until an

end-of-instruction (EOI) signal is sent to it. HP 9000 Series 200/300

BASIC allows you to send an EOI with the last data byte using the

END command. Refer to Example 11.

XAMPLE 11

10 INTEGER Tra_binary(1:601)

20 DIM Header$[2]

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

40 CALL Get_settings(Fa,Fb,Rl,Rb,Vb,St,Lg,Aunits$)

50 OUTPUT 718;"TDF I;TRA?;"

60 ENTER 718 USING "#,2A,601(W)";Header$,Tra_binary(*)

70 PRINT "PRESS CONTINUE TO RETURN DATA TO THE ANALYZER"

80 PAUSE

90 OUTPUT 718;"IP;TS;VIEW TRA;"

100 CALL Setup_analyzer(Fa,Fb,Rl,Rb,Vb,St,Lg,Aunits$)

110 OUTPUT 718;"TDF I;"

120 OUTPUT 718 USING "#,K,601(W)";"TRA#I",Tra_binary(*) END

130 END

By now most of this program should look familiar. Line 120 requires

some explanation, however. The END statement appearing after the

array Tra_binary sends (to the spectrum analyzer) the last data byte

stored in the array, with the GPIB EOI line set "true," as required by

I-block format.

See Table 5-2 on page 315 for an example of how data is sent to the

computer using the TDF I format.

1 ... 313 314 315 ... 716

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