Exfo FTB-2 User Manual download pdf (Page 333)

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101

Data Types

FTB-2 and FTB-2 Pro 323

Applicable Data Types for Input—IEEE 488.2

 <ARBITRARY BLOCK PROGRAM DATA>

This data type is used to send blocks of arbitrary 8-bit information

when you need to work with large amounts of data.

The actual length of the data that you send 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 obtain the total length.

Note: If you use a zero as the first digit (#0), it has to be followed by a

<PROGRAM MESSAGE TERMINATOR > so that the device will detect the

end of the <ARBITRARY BLOCK PROGRAM DATA>. This will also force

immediate termination of the message.

For example, if you send the following data (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 would 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.

<non-zero

digit>

<digit>

<8-bit data

byte>

<8-bit data

byte>

<PROGRAM MESSAGE

TERMINATOR>

1 2 ... 328 329 330 331 332 333 334 335 336 337 338 ... 442 443

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Exfo FTB-2 User Manual Page 333

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