Lenze SMVector RS-485 LECOM - Manual (Page 16)

14 CMVLC401A
Commissioning
Parameter values in the octet string format (VO)
The LECOM-A/B protocol includes the octet string format (VO) with which it is possible to transfer data blocks.
The character sequence corresponds to the filing in the memory (ascending order), i.e. the character transmitted first
is the data block nibble with the lowest address. The data structure of the data block corresponds to the Intel-memory
format with the following definition:
BYTE:
1st high nibble
2nd low nibble
WORD: 1st high BYTE
2nd low BYTE
DWORD: 1st high WORD
2nd low WORD
5.5 Block-Check Character (BCC)
The block-check character (BCC) is used to store the transmitted data and is generated according to DIN 66219 (chapter 3).
Because of the program, the block-check character is generated by an XOR link from the following digits of the SEND
telegram:
• it starts with the character directly after the STX control character
• it ends directly after the ETX control character
- BCC can accept the value 00 ... FF
hex
.
EOT AD1 AD2 STX C1 C2 V1 O Vn ETX BCC
BCC
or with expanded addressing:
STX “!” CH1 CH2 O SC2 ETX BCC
BCC