ChallengerPlus Installation and Quick Programming Manual 7
Figure 2: Star LAN configuration
Multi-building or long-distance LAN cabling
If the RS-485 LAN extends to more than one building, each building must have
its own earth system. LAN isolation devices, such as TS0893 LAN Isolation
Interface modules, are used to isolate the system LAN between buildings to
protect the system against differences in earth potential.
Figure 3 below shows the use of two TS0893 modules to extend the RS-485 LAN
across two electrical installations. Each TS0893 module has a pair of termination
links, used to terminate (if applicable) the LAN segment on each side of the
module’s isolation barrier.
Figure 3: RS-485 LAN cabling between two buildings
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