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USER’S GUIDE

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74-2865—04

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® 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 (L

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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

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TERMINATION

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DEVICE

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TERMINATION

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TERMINATION

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MIXED

LOOP

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SINGLY TERMINATED

STAR

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M12197

Summary of Contents for 3252

Page 1: ... 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 advanc...

Page 2: ...rk traffic may benefit from the use of a Q7751A router which forwards packets only when necessary Routers are not allowed within loops Fig 2 Repeaters and router in a FTT network Fig 3 Physical layer repeater Q7740A 2 Way or Q7750B 4 Way NETWORK CABLING AND CONNECTIONS This section provides information about cabling and FTT network connections IMPORTANT For network terminal connections twist the w...

Page 3: ... twisted pair 49 67 22 34 mm2 106 4600 feet 1400 m TIA568A Category 5 24 AWG twisted pair solid or stranded plenum or non plenum 46 58 24 27 mm2 168 3000 feet 900 m Wire Cable type Unshielded Maximum Length for Segment s Node to Node FTT Network Bus Honeywell Cable 1125 stranded non plenum 1640 feet 500 m 1640 feet 500 m Belden 85102 stranded non plenum 1640 feet 500 m 1640 feet 500 m Belden 8471 ...

Page 4: ...t See Fig 1 and 5 Fig 5 Physical connection of module for a single termination network Daisy Chain Double Termination Network Segment In a daisy chain free topology segment doubly terminated two terminations are required one at each end of the FTT daisy chained network segment See Fig 6 and 7 Fig 6 FTT termination module wiring for double termination network topology Fig 7 Physical connection of m...

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