Agilent Technologies 54503A User's Guide download pdf (Page 311)

100

101

Chapter 5 311

Programming

Data Transfer to Computer

Example 7 converts binary values to measurement data and prints

them on the computer display.

EXAMPLE 7

10 INTEGER Trace_a(1:601)

20 DIM Real_num(1:601)

30 Ref_lvl=0 !0 dBm reference level

40 Log_scale=10 !10dB/division log scale

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

60 ENTER 718 USING "#,W";Trace_a(*)

70 MAT Real_num= Trace_a

80 FOR X=1 TO 601

90 Real_num(X)=Ref_level+Log_scale*(Real_num(X)/60-10)

100 NEXT X

110 END

For converting linear data, use this equation:

where:

x = binary data in an array element.

RL = reference level. When RL is in volts, n will be in volts.

These equations are useful when you are interested in viewing only a

few points of data, rather than an entire trace. B-format saves time and

memory, and these equations provide a means to view the data, if

necessary.

NOTE It is not possible to return data to the analyzer using binary format.

You must use either A-block or I-block format. These two formats are

described below.

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

computer using the TDF B format.

TDF A (A-block format): Return Absolute Block-Data Fields in

Measurement Units

The A-block format transmits data in measurement units as binary

numbers in an absolute block-data ﬁeld, or ﬁeld of a known size, similar

to the binary format. Each data point is sent as two 8-bit bytes; the

most signiﬁcant byte is sent ﬁrst, followed by the least signiﬁcant byte.

The A-block format also transfers a four-byte header before the 601

points of trace data. The bytes are the ASCII characters "#", "A", and a

two-byte length ﬁeld specifying the number of data bytes in the block

that follows (that is, 1202).

n RL

600

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