Using the bdlc protocol – Siemens SIMATIC TIWAY 1 User Manual
Page 202
USING THE BDLC PROTOCOL
UNILINK HOST ADAPTER
B–17
USER MANUAL
Example B–3 Block Checksum Transmitter Calculation
DLE–STX
Address
Control
Information
BCS
DLE–ETX
1002
01
93
1003
“SNRM”
(Note: All values are in hexadecimal notation.)
BCS
0
1
2
3
4
5
6
7
8
9
10 12 13 14 15
MSB
LSB
Bit
Frame
Byte
BCS
MSB
BCS
LSB
01
00
01
00
01
93
94
2A
95
95
Complement
the MSB
The BCS is then D595
D5
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