Description
Trusted Communication Interface Adapter
Product Overview
This document provides general information for the Trusted® Communication Interface Adapter
T8153. The Assembly provides easy access to the communications ports of the Trusted
Communication Interface Modules in the Controller Chassis for Peer to Peer communications, DCS
and other links, networked PCs etc., and external connections.
used here so that both ends of the line with multiple transmitters connected are
terminated.
RS485 Half Duplex Multiplexed
This is the 2 wires 485 system that is only wired on the RX/TX wires.
If the Termination Assembly is at the start or end of the transmission line Connector 1 is
used and the TX/RX Termination link is fitted.
If the Termination Assembly is in the transmission line then Connector 1 is used to connect
the chain in and Connector 2 is used to wire out to the next device. No links are fitted for
this port.
RS485 Hints
The signal ground on the RS485 links must always be connected otherwise the
communications between the devices may be unreliable. When specifying cable for these
connections allowance should be made for the signal ground connection. If screened cable
is used the signal ground should not be connected to the screen. It is usual to connect the
screen to the chassis earth at one end only.
Some manufacturers tend to use + and – designations on their equipment for labelling the
pairs. Since there is no standard as to how these match up with the EIA circuit designators
the following may be useful:
With the transmission line in the ‘Idle’ or ‘Off’ state connect a multimeter on the
volts range across the pair. When the multimeter reads a negative voltage the +ve
terminal of the multimeter is connected to A and the –ve terminal is connected to B.
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Our product: brand new original packaging
Our warranty: All new or repaired parts have a 12 month warranty period beginning
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