GE Industrial Solutions AF-600 FP Lonworks - Manual (Page 9)

4.1.2 Cabling
The Free Topology Transceiver (FTT) system is designed to support free topology wiring and accommodates bus, star, loop or any combination of these topologies.
The LonWorks option is equipped with the FT-X1 transceiver for improved EMC performmance. Flexible wiring capability simplifies system installation and makes
it easy to add nodes for system expansion.
The figures below illustrate five different network topologies.
4.1.3 Network Termination
Dependent on the type of topology, at least one of the connected nodes must be terminated (52.5Ω). The option has two built-in termination circuits which are
activated by the terminator switches S300 and S301.
If termination is provided elsewhere in the network, the termination switches should be OFF. If a double-terminated bus topology is used, the first and the last
node should be double-terminated (105Ω).
Termination switch positions are shown in the table below.
AF-600 FP LonWorks
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4