Exfo FTB-500 (Window XP) Instrukcja Użytkownika Pobierz pdf (Strona 380)

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101

Data Types

372 FTB-500

Applicable Data Types for Output —IEEE 488.2

 <DEFINITE LENGTH ARBITRARY BLOCK RESPONSE DATA>

This data type is used by a device to return blocks of 8-bit binary

information with a fixed and predetermined length.

The actual length of the retrieved data has the following structure:

 The first byte contains the # character.

 The byte that immediately follows contains the number of

subsequent bytes that you have to check to know the total length.

For example, if you receive this response (here, values are expressed

in decimal instead of binary for easier readability):

# 2 1 3 7 6 8 9 2 ...

The byte that immediately follows the # contains 2, which means that

you have to read the two following bytes to know the length (in bytes)

of the retrieved data. The bytes indicate 1 and 3. The length will then

be 13 bytes. The actual response will begin at byte number 5, in this

case.

Examples: #14<DAB><DAB><DAB><DAB>,

#3004<DAB><DAB><DAB><DAB>

where “<DAB>” stands for data byte

<non-zero

digit>

<digit>

<8-bit data

byte>

1 2 ... 375 376 377 378 379 380 381 382 383 384 385 ... 476 477

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