Name: Siemens SIMATIC S7-400 CP 440
Brand: Siemens
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Basic Principles of Serial Data Transmission

2.5 Data Transmission with the 3964(R) Procedure

Point-to-point connection CP 440 Installation and Parameter Assignment

44 Manual, 09/2007, A5E00057742-03

2.5.2 Block Checksum

Block Checksum

With the 3964(R) transmission protocol, data integrity is increased by the additional sending

of a block check character (BCC).

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   

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+ൺ+ൺ+ൺ+ൺ+ൺ+ൺ+

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Figure 2-12 Block Checksum

The block checksum is the even longitudinal parity (EXOR operation on all data bytes) of a

sent or received block. Its calculation begins with the first byte of user data (first byte of the

message frame) after the connection setup, and ends after the DLE ETX code on connection

release.

Note

If DLE duplication occurs, the DLE code is accounted for twice in the BCC calculation.

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