
43
B.4 Checksum for data communications using both v1.2 protocol, and v1.3 protocol is
calculated according to Figure B.1.
byte
i
D7
D6
D5
D4
D3
D2
D1
D0
arithmetical summation
checksum
i-1
D7
D6
D5
D4
D3
D2
D1
D0
partial result
carry
D7
D6
D5
D4
D3
D2
D1
D0
arithmetical summation
carry
checksum
i
D7
D6
D5
D4
D3
D2
D1
D0
Figure B.1 – Checksum calculation algorithm
B.5 CA6GS 932326-100 HIRSCHMANN interface connection serves to connect the data
display system to the detecting unit. The interface connection contains the following signals:
Signal
Contact
(RS-485) Circuit A
1
(RS-485) Circuit B
2
Reserve
3
Supply voltage
4
Total
5
Shield
6
Shield
7