Siemens SIMATIC TIWAY 1 User Manual page 202

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