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Group 90 — Communications
MVX9000 User Manual
5-69
Descriptions of
Parameter Settings
Table 5-5: Communication Protocol
ASCII mode
RTU mode
STX
ADR
1
ADR
0
CMD
1
CMD
0
0
1
......
N-1
N
ETX
CHK
1
CHK
0
02H
Address
CMD
Data characters
03H
Check Sum
STX
Start character: (3AH)
ADR 1
Communication address:
8-bit address consists of 2 ASCII codes
ADR 0
CMD 1
CMD 0
DATA (n-1)
Contents of data:
Maximum: 20-word registers
........
DATA 0
LRC
CHK 1
LRC check sum:
8-bit check sum consists of 2 ASCII codes
LRC
CHK 0
END 1
END characters:
END 1 = CR (0DH), END 0 = LF (0AH)
END 0
START
A silent interval of more than 10 ms
ADR Communication
address:
8-bit address
CMD
Command code:
8-bit command
DATA (n-1)
Contents of data:
Maximum: 20-word registers
........
DATA 0
CRC CHK Low
CRC check sum:
16-bit check sum consists of 2 8-bit characters
CRC CHK High
END
A silent interval of more than 10 ms
Содержание MVX9000 Series
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