Circutor DHC-96 Aac - 6�- Rs-485 Communications; 6�1�- Connections

6�- RS-485 COMMUNICATIONS
The DHC-96 devices have one RS-485 communications port,with communications protocols:
MODBUS RTU ® .
6.1.- CONNECTIONS
The RS-485 cable must be wired with twisted pair cable with mesh shield, with a maximum
distance between the DHC-96 and the master device of 1200 metres.
A maximum of 32 DHC-96 devices can be connected to this bus.
Use an intelligent RS-232 to RS-485 network protocol converter to establish the
communications with the master device.
14
70 5971
1 2
11
72 58 28 29 31 32 1615
B A
RS-485
14
70 5971
1 2
11
72 58 28 29 31 32 1615
B A
RS-485
B(-) A(+)
RS-232 / USB / Ethernet / Profibus ...
PC
RS-485
RS-485
RS-232
USB
Ethernet
Profibus
...
Figure 21: RS-485 Connection diagram�
Note: Default values of the RS-485 communication : 19200 bps, No parity, 8 data bits and 1
stop bit.
32
DHC-96 Aac
Instruction Manual