Fuji Electric ALPHA5 Smart - Page 518

CHAPTER 13 RS-485 COMMUNICATIONS
13-30
Modbus RTU Communications
13
bit
No. Calculations
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Shift carry
41 DT[5] (No. of registers (L)) 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0
42 CRC = No.40 XOR No.41 0 1 0 1 0 0 0 0 0 0 0 0 1 0 0 0
43 Shift CRC by 4 bits to the right 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 1
44 CRC = No.43 XOR No.2 1 0 1 0 0 1 0 1 0 0 0 0 0 0 0 1
45 Shift CRC by 1 bit to the right 0 1 0 1 0 0 1 0 1 0 0 0 0 0 0 0 1
46 CRC = No.45 XOR No.2 1 1 1 1 0 0 1 0 1 0 0 0 0 0 0 1
47 Shift CRC by 1 bit to the right 0 1 1 1 1 0 0 1 0 1 0 0 0 0 0 0 1
48 CRC = No.47 XOR No.2 1 1 0 1 1 0 0 1 0 1 0 0 0 0 0 1
49 Shift CRC by 1 bit to the right 0 1 1 0 1 1 0 0 1 0 1 0 0 0 0 0 1
50 CRC = No.49 XOR No.2 1 1 0 0 1 1 0 0 1 0 1 0 0 0 0 1
51 Shift CRC by 1 bit to the right 0 1 1 0 0 1 1 0 0 1 0 1 0 0 0 0 1
52 CRC = No.51 XOR No.2
1 1 0 0 0 1 1 0 0 1 0 1 0 0 0 1