Agilent Technologies 4294A Service Manual download pdf (Page 78)

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78 Chapter 6

Reading/Writing Measurement Data

Data Transfer Format

The format applicable when you read measurement parameter settings from the

Agilent

4294A (as when you read the sweep start point with “STAR?”) is the ASCII

format, regardless of which data transfer format has been specified.

You can select either the ASCII format (default) or one of the binary formats for reading

measurement data, waveform analysis results and so on from the Agilent 4294A (as when

you read a data trace array with “OUTPDTRC?”). As for binary formats, you can select the

IEEE 32-bit floating point format, IEEE 64-bit floating point format, or MS-DOS personal

computer format as the appropriate format for your controller. Use the following

commands for selecting a desired data transfer format:

ASCII format (Form 4)

When you select the ASCII format as the data transfer format, numbers are transferred as

ASCII bytes, each of which corresponds to one of the formats shown below. Note that

numbers are separated from one another with a comma (“,”) in accordance with the IEEE

488.2 specification.

NOTE Each numeric data character string is different in length from the others. Before extracting

each piece of data from character strings, therefore, you must remember that commas do

not always appear in the same locations.

• Integer Format

Figure 6-1 shows this format. Numbers are expressed as integers. For example, 201 is

expressed as “+201” or “201.”

Figure 6-1 Integer Format

Data Transfer Format Command

IEEE 32-bit floating point format “FORM2” on page 316

IEEE 64-bit floating point format “FORM3” on page 316

ASCII format (Default) “FORM4” on page 317

MS-DOS personal computer format “FORM5” on page 317

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