
36
RGU-10, RGU-10C
Instruction Manual
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�
Содержание RGU-10
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