Echelon DM-21 Device Manager - Manual (Page 22)

3-2 Network Cabling and Base Plate Installation
Network Cabling - TP/FT-10 Channel
The Device Manager Modules 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
devices anywhere on the network cabling provided only that the maximum
cabling distance limitations are observed. 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)