Honeywell LONWORKS BUS 1061 User's Manual

Honeywell Network Cables User's Manual - LONWORKS BUS 1061.
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USER’S GUIDE

Put Bar Code Here

74-2865—04

LONWORKS® Bus 
Wiring Guidelines
HONEYWELL CABLE 3252, 3253, 1061, 
AK3797, AK3798, AK3799

INTRODUCTION

The Free Topology Transceiver (FTT) supports polarity 
insensitive, free topology wiring. This frees the system 
installer from wiring using a specific bus topology. T-tap, star, 
loop, and mixed wiring topologies are all supported by this 
architecture. Free topology wiring reduces the time and 
expense of system installation by allowing the wiring to be 
installed in the most expeditious manner. It also simplifies 
network expansion by eliminating restrictions on wire routing, 
splicing, and device placement.

A FTT network may comprise multiple segments (LONWORKS 
Bus sections containing from one to sixty devices, each 
device having a Neuron® ID to validate) separated by 
physical layer repeaters or routers.

FTT networks are very flexible and convenient to install and 
maintain, but it is imperative to carefully plan the network 
layout and create and maintain accurate documentation. This 
will aid in compliance verification and future expansion of the 
FTT network. This will also minimize unknown or inaccurate 
wire run lengths, node-to-node (device-to-device) distances, 
node counts, total wire length, inaccurate repeater/router 
locations, and misplaced or missing terminations.

APPLICATIONS

Free topology architecture allows the user to wire the control 
devices with virtually no topology restrictions.

Unlike bus wiring designs, the FTT system uses a free 
topology wiring scheme that supports T-tap, star, loop, mixed, 
and/or daisy-chain (see Fig. 1). This design has many 
advantages. First, the installer is free to select the method of 
wiring that best suits the installation, reducing the need for 
advanced planning and allowing last minute changes at the 
installation site. Second, if installers have been trained to use 
one style of wiring for all installations, free topology 
technology can be introduced without requiring retraining. 
Third, retrofit installations with existing wiring plans can be 
accommodated with minimal, if any, rewiring. This capability 
ensures that FTT technology can be adapted to both old and 
new projects, widening the potential market for FTT based 
products. Finally, free topology allows FTT systems easy 
future expansion by tapping into the existing wiring where it is 
most convenient to do so. This reduces the time and expense 
of system expansion, and from the customers’ perspective, 
keeps down the life cycle cost of the free topology network.

Fig. 1. Typical wiring topologies 

supported by the FTT System.

TERMINATION

MODULE

TERMINATION

MODULE

DEVICE

DEVICE

DEVICE

TERMINATION

MODULE

TERMINATION

MODULE

DEVICE

DEVICE

DEVICE

MIXED

LOOP

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

SINGLY TERMINATED

STAR

DEVICE

DEVICE

DEVICE

DEVICE

DEVICE

M12197

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