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Check Code - NEC MultiSync V422 Control Manual

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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
= D
XOR D
n+1
1
2
XOR: Exclusive OR
Following is an example of a Check code (BCC) calculation.
Destination
SOH
Reserved
Address
01
30
41
D
D
D
0
1
2
Check code (BCC) D
Header
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
XOR D
XOR ,,, D
3
n
Header
Source
Message
Message length
Address
type
30
45
30
D
D
D
3
4
5
= D
xor D
17
1
= 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
Message
Check code
7
6
5
4
2
2
2
2
P
P
P
P
OP code
STX
page
41
02
30
30
D
D
D
D
6
7
8
9
xor ... xor D
xor D
2
3
14
(11/71)
Delimiter
3
2
1
0
2
2
2
2
P
P
P
P
Message
OP code
Set Value
31
30
30
30
36
34
D
D
D
D
D
D
10
11
12
13
14
15
xor D
xor D
15
16
Check
code
Delimiter
ETX
(BCC)
03
77
0D
D
D
D
16
17
18

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