Danfoss VLT MICRO Manual page 91

• (8, O, 1: Pr.92 = 5)
Start 0 1
bit
3 Communication Protocol
3.1 Communication Data Frame:
ADR ADR CMD
STX
1 0
02H Address
3.2 ASCII mode:
STX Start character: (3AH)
ADR 1
ADR 0 Communication address:
CMD 1 8-bit adress consists of 2 ASCII codes
CMD 0
DATA (n-1) Contents of data:
.......... n x 8-bit data consist of 2n ASCII codes.
DATA 0 n 25 maximum of 50 ASCII codes
LRC CHK 1 LRC check sum:
LRC CHK 0 8-bit check sum consists of 2 ASCII codes
END 1 END characters:
END 0 END 1 = CR (0DH), END 0 = LF (0AH)
RTU mode:
START
ADR
CMD
DATA (n-1)
..........
DATA 0
CRC CHK Low
CRC CHK High
END
2 3 4
8-bit character
11-bit character frame
CMD 0 1
1 0
CMD Data Characters
Asilent interval of more than 10 ms
Communication address:
8-bit address
Command code:
8-bit command
Contents of data
nx8-bit data, n<=25
CRC check sum:
16-bit check sum consists of 2 8-bit characters
A silent interval of more than 10 ms
91
VLT
5 6 7
......
N-1 N ETX
03H
® ® ® ® ®
MICRO
Odd Stop
parity bit
CHK CHK
1 0
Check Sum