Specifications

77
Schneider Electric
The Modbus Protocol (continued)
Electrical interpretation of the CRC on a RS485 network:
v In our example, the query from the master is:
v In this case, the response would be:
Thus the signal is interpreted as: $ 41 17
(as expected).
E52397E52398E52399
02 0B 41 17
02 0B 00 00
counter contents
(00 00 in this
case)”.
A4 38
CRC 16
LSB
MSB
+ 5V
OV
- 5V
0
0
00
0
01
0
101
1
1
0
10
0
0
1
1
Start
Stop
Stop
Start
D1
D2 D3
D4
D5 D6
D7
D0
D1
D2 D3
D4
D5 D6
D7
D0
1
4
7
1
Guide to Integration
Modbus / Jbus