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4.3 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
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(H)
D
5
Length(L)
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 Destination
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
Summary of Contents for LCD Monitor
Page 6: ... 6 137 Please refer Controlling the LCD monitor via LAN control on User s manual ...
Page 14: ... 14 137 4 4 Delimiter Packet delimiter code ASCII CR 0Dh Header Message Check code Delimiter ...
Page 17: ... 17 137 18th byte ETX End of Message ASCII ETX 03h ...
Page 49: ... 49 137 CR 0Dh End of packet ...
Page 85: ... 85 137 Delimiter CR 0Dh End of packet ...
Page 90: ... 90 137 Delimiter CR 0Dh End of packet ...
Page 92: ... 92 137 Delimiter CR 0Dh End of packet ...
Page 94: ... 94 137 Delimiter CR 0Dh End of packet ...
Page 98: ... 98 137 Delimiter CR 0Dh End of packet ...
Page 102: ... 102 137 Delimiter CR 0Dh End of packet ...
Page 104: ... 104 137 Delimiter CR 0Dh End of packet ...
Page 106: ... 106 137 Delimiter CR 0Dh End of packet ...
Page 108: ... 108 137 Delimiter CR 0Dh End of packet ...
Page 111: ... 111 137 Delimiter CR 0Dh End of packet ...
Page 114: ... 114 137 Delimiter CR 0Dh End of packet ...
Page 120: ... 120 137 Delimiter CR 0Dh End of packet ...
Page 122: ... 122 137 Delimiter CR 0Dh End of packet ...
Page 130: ... 130 137 Delimiter CR 0Dh End of packet ...