8
5.1.3. Check code
Check code is the Block Check Code (BCC) between the Header and the End of Message except SOH.
D
n+1
= D
1
XOR D
2
XOR D
3
XOR ,,, D
n
XOR: Exclusive OR
Following is an example of a Check code (BCC) calculation.
Check code (BCC) D
17
= D
1
xor D
2
xor D
3
xor
…
xor D
14
xor D
15
xor D
16
= 30h xor 41h xor 30h xor 45h xor 30h xor 41h
xor 02h xor 30h xor 30h xor 31h xor 30h xor 30h
xor 30h xor 36h xor 34h xor 03h
= 77h
5.1.4. Delimiter
Packet delimiter code; ASCII CR(
0Dh
).
Header Message
Check code
Delimiter
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
SOH
D
0
Reserved
D
1
Destination
D
2
Source
D
3
Type
D
4
Length
D
5
D
6
STX
D
7
Data
D
8
|
|
|
|
ETX
D
n
Check code
D
n+1
P
P
P
P
P
P
P
P
Header
Message
SOH Reserved
Destina
tion
Address
Source
Address
Message
type Message length STX
OP code
page OP code Set Value
ETX
Check
code
(BCC)
Delimiter
01
30
41
30
45
30
41
02 30 30 31 30 30 30 36 34 03
77
0D
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
8
D
9
D
10
D
11
D
12
D
13
D
14
D
15
D
16
D
17
D
18
Header Message Check code
Delimiter
