User`s manual

SECTION 6: T200 FUNCTIONAL OVERVIEW T200 User's Manual
PAGE 6-77
Read Block Data from T200
Block data is read from the T200 in sections of up to 64 bytes, known as paragraphs.
The command code for reading a block of data from the T200 is 17 . The data required is:
• Block number.
• Paragraph number.
• Number of bytes to be read.
Paragraphs should all be 64 bytes long except for the last, which may be up to 64 bytes long.
To read a paragraph of block data from T200, the following message (series of bytes) should be sent to the T200:
Byte Value Meaning
1 06 Length of command
2 00 Address
3 17 Command (Read paragraph of block data)
4 PA Paragraph no
5 BL Block number
6 LP Length of paragraph
7 CK Checksum
T200 Acknowledgement to Block Data Read
The acknowledge data for a block data read command is the value of the data to be read. The acknowledgement will
take the form:
Byte Value Meaning
1 04 Length of command
2 128 Address
3 17 Acknowledge read paragraph of block data
4 2 Acknowledge status
5 151 Additive Check sum MODULO 256 of 4, 128, 17, 2