6�- RS-485 COMMUNICATIONS
RGU-10C devices feature one RS-485 communications port. The device has uses the MOD-
BUS RTU communications protocol as the standard protocol.
6.1.- CONNECTIONS
The RS-485 cable must be wired with twisted pair cable with mesh shield (minimum 3 wires),
with a maximum distance between the RGU-10C and the master device of 1200 metres.
Up to 32 RGU-10C 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.
B(-) A(+)
S (GND)
B(-)A(+) S
RS-232 / USB / Ethernet / Profibus ...
PC
RS-485
RS-485
RS-232
USB
Ethernet
Profibus
...
Figure 32: RS-485 Connection diagram�
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