Exfo FTB-2 Manual do Utilizador descarregar pdf (Página 344)

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101

Data Types

334 FTB-2 and FTB-2 Pro

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 ... 339 340 341 342 343 344 345 346 347 348 349 ... 442 443

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Exfo FTB-2 Manual do Utilizador Página 344

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