4230/4232/4235 Communications modules
8-15
Cable screens should be connected to the Controller case at one end
only. For the cables which connect CONN2 of the Controllers
together, choose either the upstream or downstream end and connect
the screens at that end only.
Connecting downstream Comms modules
The upstream RS485 connections of all the 4232 Comms modules in
the branch must be connected together in parallel. The upstream
Comms module must then be connected via its downstream RS485
connections to the upstream RS485 connections of one of the 4232
Comms modules.
Upstream Downstream
Comms module Comms modules
(CONN4) (CONN1)
Scr Connect cable screens to a Controller case at one end only
RXD TXD
RXD TXD
TXD RXD
TXD RXD
SE No connection - signal earth not required
(CONN4)
RXD
RXD
TXD
TXD
RXD
RXD
TXD
TXD
(CONN1)
RXD
RXD
TXD
TXD
(CONN1)
RXD
RXD
(CONN1)
TXD
TXD
Upstream
Comms
Module
Downstream
Comms
Module
Downstream
Comms
Module
Down-
stream
Comms
Module
Note: at the connection between the upstream Comms module and
the others, TXD and RXD are swapped (as shown inside the circle in
the diagram). All the RXDs from the downstream Comms modules are
connected to the TXD of the upstream Comms module. All the
s
from the downstream Comms modules are connected to the
of
the upstream Comms module. All the TXDs from the downstream
Comms modules are connected to the RXD of the upstream Comms
module. All the
s from the downstream Comms modules are
connected to the
of the upstream Comms module.
To Next Page
Loading...
Need help?
General