Eaton MVX9000 - CHK (Check Sum); Table 5-10: ASCII Mode; Table 5-11: RTU Mode

Group 90 — Communications
MVX9000 User Manual 5-73
Descriptions of
Parameter Settings
CHK (Check Sum)
Table 5-10: ASCII mode
LRC (Longitudinal Redundancy Check) is calculated by summing up, module 256,
the values of the bytes from ADR1 to last data character then calculating the
hexadecimal representation of the 2’s-complement negation of the sum.
For example, reading 1 word from address 0401H of the AC drive with address 01H.
Table 5-11: RTU mode
STX :
ADR 1
ADR 0
0
1
CMD 1
CMD 0
0
3
Starting data address 0
4
0
1
Number of data 0
01H+03H+04H+01H+00H+01H=0AH, the
2’s-complement negation of 0AH is F6H.
0
0
1
LRC CHK 1
LRC CHK 0
F
6
END 1
END 0
CR
LF
ADR
01H
CMD
03H
Starting address
21H
02H
Number of data
(count by word)
00H
02H
CRC CHK Low 6FH
CRC CHK High F7H