EUCHNER HBLS 072725 - Handbuch (Seite 34)

EUCHNER Pendant station HBLS 072725
067018-08-01/06 Subject to technical modifications page 12 / 22
8.4 Examples of BCC-Calculation
example 1, LED 7 switching ON:
Byte 1
Byte 2 LEDBYTE (37H = LED 7 ON)
Byte 3 DLE (10H)
Byte 4 ETX (03H)
Byte 5 BCC
37
XOR 10 = 27
27 XOR 03 = 24
BCC = 24
simplified variation:
Data Block, existing of 1 character: 37 XOR 13 = 24
example 2, display text
Euchner:
Example of a data block, which displays the text
Euchner at the actual cursor position:
0x6C 0xA5 0xD5 0xC3 0xC8 0xCE 0xC5 0xD2
Byte 1
Byte 2 LCD mode byte (6CH)
Byte 3 ... 9 A5H, D5H, C3H, C8H, CEH, C5H, D2H
Byte 10 DLE (10H)
Byte 11 ETX (03H)
Byte 12 BCC (created by bytes 1 to 11)
6C XOR A5 = C9
C9 XOR D5= 1C
1C XOR C3 = DF
DF XOR C8 = 17
17 XOR CE = D9
D9 XOR C5 = 1C
1C XOR D2 =CE
CE XOR 10 = DE
DE XOR 03 = DD
BCC = DD
simplified variation:
Data Block existing of
6CH, XOR A5H, XOR D5H, XOR C3H, XOR C8H, XOR CEH, XOR C5H, XOR D2H = CE
CE XOR 13 = DD