Calculation Example - Fuji Electric FRENIC-AQUA series User Manual

3.4.3

Calculation example

Example of transmitting read data
Station address = 1, 'FC' = 3, function code = P02 (P = 03
20, GP = generative polynomial expression(1010 0000 0000 0001)
Station
address
01
H
N PROCESS
1 Initial data R = "FFFF"
st
2 1 data byte
3 CRC = No.1 Xor No.2
4 Shift > 2 (up to flag = 1)
5 CRC = No.4 Xor GP
6 Shift > 2
7 CRC = No.6 Xor GP
8 Shift > 2
9 CRC = No.8 Xor GP
10 Shift > 2
(shift of No. 8 terminated)
11 CRC = No.10 Xor GP
nd
12 2 data byte
13 CRC = No.11 Xor No.12
14 Shift > 1
15 CRC = No.14 Xor GP
16 Shift > 1
17 CRC = No.16 Xor GP
18 Shift > 2
19 CRC = No.18 Xor GP
20 Shift > 2
21 CRC = No.20 Xor GP
22 Shift > 2
(shift of No. 8 terminated)
rd
23 3 data byte
24 CRC = No.22 Xor No.23
25 Shift > 1
26 CRC = No.25 Xor GP
27 Shift > 6
28 CRC = No.27 Xor GP
29 Shift > 1
30 CRC = No.29 Xor GP
th
31 4 data byte
32 CRC = No.30 Xor No.31
33 Shift > 2
34 CRC = No.33 Xor GP
35 Shift > 1
36 CRC = No.35 Xor GP
37 Shift > 1
'FC' Function code
03 03
H H
Table 3.13 CRC data calculation table
15 14 13 12
1 1 1 1
0 0 0 0
1 1 1 1
0 0 1 1
1 0 0 1
0 0 1 0
1 0 0 0
0 0 1 0
1 0 0 0
0 0 1 0
1 0 0 0
0 0 0 0
1 0 0 0
0 1 0 0
1 1 1 0
0 1 1 1
1 1 0 1
0 0 1 1
1 0 0 1
0 0 1 0
1 0 0 0
0 0 1 0
0 0 0 0
0 0 1 0
0 0 0 1
1 0 1 1
0 0 0 0
1 0 1 0
0 1 0 1
1 1 1 1
0 0 0 0
1 1 1 1
0 0 1 1
1 0 0 1
0 1 0 0
1 1 1 0
0 1 1 1
, 02 = 02
H
Number of read data
02 00
H H
11 10 9 8 7 6
1 1 1 1 1 1
0 0 0 0 0 0
1 1 1 1 1 1
1 1 1 1 1 1
1 1 1 1 1 1
0 1 1 1 1 1
0 1 1 1 1 1
0 0 0 1 1 1
0 0 0 1 1 1
0 0 0 0 0 1
0 0 0 0 0 1
0 0 0 0 0 0
0 0 0 0 0 1
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
0 1 0 0 0 0
0 1 0 0 0 0
0 1 0 1 0 0
0 1 0 1 0 0
0 0 0 1 0 1
0 0 0 0 0 0
0 0 0 1 0 1
0 0 0 0 1 0
0 0 0 0 1 0
0 0 1 0 1 1
0 0 1 0 1 1
0 0 0 1 0 1
0 0 0 1 0 1
0 0 0 0 0 0
0 0 0 1 0 1
1 1 0 0 0 1
1 1 0 0 0 1
1 1 1 0 0 0
1 1 1 0 0 0
0 1 1 1 0 0
3-22
), number of read data =
H
14
H
5 4 3 2 1 0
1 1 1 1 1 1
0 0 0 0 0 1
1 1 1 1 1 0
1 1 1 1 1 1
1 1 1 1 1 0
1 1 1 1 1 1
1 1 1 1 1 0
1 1 1 1 1 1
1 1 1 1 1 0
1 1 1 1 1 1
1 1 1 1 1 0
0 0 0 0 1 1
1 1 1 1 0 1
1 1 1 1 1 0
1 1 1 1 1 1
0 1 1 1 1 1
0 1 1 1 1 0
0 0 0 1 1 1
0 0 0 1 1 0
0 0 0 0 0 1
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 1 1
0 0 0 0 1 1
1 0 0 0 0 1
1 0 0 0 0 0
0 0 0 0 1 0
0 0 0 0 1 1
1 0 0 0 0 1
1 0 0 0 0 0
0 0 0 0 1 0
1 0 0 0 1 0
0 1 1 0 0 0
0 1 1 0 0 1
1 0 1 1 0 0
1 0 1 1 0 1
0 1 0 1 1 0
(To be continued)
Flag
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1