LONWORKS® Bus
Wiring Guidelines
HONEYWELL CABLE 3252, 3253, 1061,
AK3797, AK3798, AK3799
USER’S GUIDE
INTRODUCTION
DEVICE
DEVICE
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.
DEVICE
DEVICE
DEVICE
DEVICE
TERMINATION
MODULE
SINGLY TERMINATED
DEVICE
DEVICE
TERMINATION
MODULE
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.
DEVICE
DEVICE
STAR
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.
DEVICE
DEVICE
DEVICE
DEVICE
APPLICATIONS
Free topology architecture allows the user to wire the control
devices with virtually no topology restrictions.
DEVICE
DEVICE
DEVICE
DEVICE
DEVICE
DEVICE
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
TERMINATION
DEVICE
DEVICE
MODULE
MIXED
TERMINATION
MODULE
DEVICE
DEVICE
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.
DEVICE
LOOP
M12197
Fig. 1. Typical wiring topologies
supported by the FTT System.
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LONWORKS® BUS WIRING GUIDELINES
Table 1. Daisy-chain FTT Network Bus Topology Transmission Specifications (Doubly Terminated).
Cable Parameters
Maximum FTT Network Bus
Length for Segment(s)
Wire/Cable Type (Unshielded)
C nF/km Vprop% of c AWG/Dia. RloopW/km
2
Honeywell Cable 1125 (stranded non-plenum) 79
67
17.9
28
4600 feet (1400 m)
8900 feet (2700 m)
16/1.5 mm
16/1.5 mm
2
Belden 85102 (stranded non-plenum)
Belden 8471 (stranded non-plenum)
56
72
62
55
67
2
2
Level IV Cable Specifications, 22AWG (solid/ 49
stranded twisted pair)
106
168
4600 feet (1400 m)
3000 feet (900 m)
22/.34 mm
24/.27 mm
TIA568A Category 5 24 AWG (twisted pair
solid or stranded, plenum or non-plenum)
46
58
NOTES:
—
—
—
See Table 2 for singly terminated FTT network bus topology transmission specifications.
See Tables 3 and 4 for a list of Honeywell provided FTT daisy-chain and free topology network wire/cables.
See the generic cable manufacturer information that meets Echelon LonWorks Bus specifications in Table 5.
Table 2. FTT Network Free Topology Transmission Specifications (Singly Terminated).
Maximum Length for Segment(s)
Wire/Cable type (Unshielded)
Node-to-Node
1640 feet (500 m)
1640 feet (500 m)
1300 feet (400 m)
FTT Network Bus
1640 feet (500 m)
1640 feet (500 m)
Honeywell Cable 1125 (stranded non-plenum)
Belden 85102 (stranded non-plenum)
Belden 8471 (stranded non-plenum)
Level IV Cable Specifications, 22AWG (solid/stranded twisted pair)
TIA568A Category 5 24 AWG twisted pair (solid or stranded, plenum or 820 feet (250 m)
non-plenum)
1500 feet (450 m)
Table 3. Honeywell Provided Daisy-Chain (Doubly Terminated) FTT Network Wire/Cables.
Wire/Cable Type (Stranded Unshielded)
Honeywell Cable 3252 - plenum (one twisted pair)
Honeywell Cable 3253 - plenum (two twisted pair)
Honeywell Cable 1061 - non-plenum (one twisted pair)
Paige AK3797 - plenum (one twisted pair)
Maximum FTT Network Bus Length for Segment(s)
4600 feet (1400 m)
Paige AK3799 - plenum (two twisted pair)
Paige AK3798 - non-plenum (one twisted pair)
Table 4. Honeywell Provided Free Topology (Singly Terminated) FTT Network Wire/Cables.
Maximum Length for Segment(s)
Wire/Cable Type (Stranded Unshielded)
Honeywell Cable 3252 - plenum (one twisted pair)
Honeywell Cable 3253 - plenum (two twisted pair)
Honeywell Cable 1061 - non-plenum (one twisted pair)
Paige AK3797 - plenum (one twisted pair)
FTT Network Bus
1640 feet (500 m)
Node-to-Node
1300 feet (400 m)
Paige AK3799 - plenum (two twisted pair)
Paige AK3798 - non-plenum (one twisted pair)
3
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LONWORKS® BUS WIRING GUIDELINES
2
Table 5. Echelon Generic Cable Specification For Belden 85102 Equivalent, Stranded Twisted Pair 16 AWG (1.5 mm ).
Minimum Typical Maximum Units Condition
DC Resistance, each conductor
DC Resistance Unbalance
Mutual Capacitance
Characteristic Impedance
Attenuation
14.0
14.7
15.5
Ohms/km 20°C per ASTM D 4566
20°C per ASTM D 4566
per ASTM D 4566
92
100
108
Ohms
64 khz to 1 Mhz, per ASTM D 4566
20 khz
1.3
1.9
2.2
3.0
4.8
8.1
11.3
13.7
5.6
Db/km
20°C per ASTM D 4566
64 khz
78 khz
156 khz
256 khz
512 khz
772 khz
1000 khz
Propagation Delay
Nsec/m
78 khz
Cable Termination
Daisy-Chain (Double Termination)
Network Segment
The FTT network segment requires termination for proper
data transmission performance. Use a 209541B FTT
termination module. Free topology (singly terminated)
segments use the yellow and brown wires. Daisy-chain
(doubly terminated) segments use the orange and brown
wires. See Fig. 4.
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.
DEVICE
DEVICE
(DAISY CHAINED)
(DAISY CHAINED)
YELLOW
ORANGE
BROWN
TERMINATION
MODULE
TERMINATION
MODULE
M12198
DEVICE
DEVICE
DEVICE
M12199
Fig. 4. 209541B FTT termination module.
Fig. 6. FTT termination module wiring for
double termination network topology.
Free Topology (Single Termination)
Network Segment
LONWORKS-BUS
BROWN
ORANGE
YELLOW
LONWORKS-BUS
BROWN
ORANGE
YELLOW
In a free topology segment (singly terminated) only one
termination is required and the termination can be placed
anywhere on the free topology segment. See Fig. 1 and 5.
M12201
LONWORKS-BUS
Fig. 7. Physical connection of modules
for a double termination network.
BROWN
YELLOW
ORANGE
M12200
LONWORKS®, Neuron®, LONMARK® and LONMARK® logo are
registered trademarks of Echelon® Corporation.
Fig. 5. Physical connection of module
for a single termination network.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
Honeywell GmbH
Böblinger Straße 17
D-71101 Schönaich
customer.honeywell.com
® U.S. Registered Trademark
© 2008 Honeywell International Inc.
74-2865—04 K.K. Rev. 11-08
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