Echelon LonPoint Module - Manual (Page 27)

LonPoint Hardware Guide 3-5
If a shielded cable is used, the shield should be connected to earth ground via the
termination circuit shown in the L ON W ORKS FTT-10A Free Topology Transceiver
User's Guide, version 5 or later.
Distributors of cable are listed in Echelon’s engineering bulletin, Junction Box and
Wiring Guidelines
, part number 005-0023-01.
Table 3.2 Doubly-Terminated Bus Topology Specifications
(Requires Two Model 44101 Terminators)
Maximum bus length
Wire Diameter
AWG/mm
Belden 85102 2700 meters 16AWG/1.3mm
Belden 8471 2700 meters 16AWG/1.3mm
Level IV, 22AWG 1400 meters 22AWG/0.65mm
JY (St) Y 2x2x0.8 900 meters 20.4AWG/0.8mm
TIA Category 5 900 meters 24AWG/0.51mm
A doubly-terminated bus may have cable lengths (stubs) of up to 3 meters from the
bus to each LonPoint module, network interface, or third-party device.
TP/FT-10 Cable Termination
The TP/FT-10 channel must be terminated for proper data transmission performance.
Free Topology
If free topology cabling is used then only one Model 44100 Terminator is required and
may be placed anywhere on the free topology segment, as shown in figure 3.6. The
Model 44100 Terminator's orange wires should be connected to the twisted pair
network. The Terminator's green wire must be connected to earth ground. The green
wire must never be connected to the shield of a twisted pair cable.
Termination
orange
Network
green
44100
Terminator
Figure 3.6 Single Termination for Free Topology (Model 44100 Terminator)