Echelon LonPoint Module - Manual (Page 24)

3-2 Network Cabling and Connections
Network Cabling - TP/FT-10 Channel
The LonPoint modules (excluding some LPR Routers) use Echelon’s FTT-10A Free
Topology Transceiver for network communications. This transceiver operates at 78
kilobits per second and is designed to support free topology wiring; it will accommodate
bus, star, loop, or any combination of these cabling topologies using a twisted pair cable.
By eliminating restrictions on the cabling topology, the installer is free to locate
LonPoint modules anywhere on the network cabling provided only that the maximum
cabling distance limitations are observed99 This capability simplifies system installation
and makes it easy to add nodes should the network need to be expanded. Figures 3.1
through 3.5 present five typical network topologies.
In free topology cabling it is necessary to use one Echelon Model 44100 terminator.
In bus topology cabling it is necessary to use two Echelon Model 44101 terminators.
Terminators are required for proper network operation and must not be omitted.
Termination
Figure 3.1 Singly Terminated Bus Topology (Model 44100 Terminator)
Termination
Figure 3.2 Star Topology (Model 44100 Terminator)
Termination
Figure 3.3 Loop Topology (Model 44100 Terminator)