LONWORKS® BUS WIRING GUIDELINES
® U.S. Registered Trademark
© 2008 Honeywell International Inc.
74-2865—04 K.K. Rev. 11-08
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9
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D-71101 Schönaich
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Table 5. Echelon Generic Cable Specification For Belden 85102 Equivalent, Stranded Twisted Pair 16 AWG (1.5 mm2).
Cable Termination
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.
Fig. 4. 209541B FTT termination module.
Free Topology (Single Termination) Network Segment
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.
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 modules
for a double termination network.
LONWORKS®, Neuron®, LONMARK® and LONMARK® logo are
registered trademarks of Echelon® Corporation.
Minimum Typical Maximum Units Condition
DC Resistance, each conductor 14.0 14.7 15.5 Ohms/km 20°C per ASTM D 4566
DC Resistance Unbalance 20°C per ASTM D 4566
Mutual Capacitance per ASTM D 4566
Characteristic Impedance 92 100 108 Ohms 64 khz to 1 Mhz, per ASTM D 4566
Attenuation
20 khz 1.3 Db/km 20°C per ASTM D 4566
64 khz 1.9
78 khz 2.2
156 khz 3.0
256 khz 4.8
512 khz 8.1
772 khz 11.3
1000 khz 13.7
Propagation Delay 5.6 Nsec/m 78 khz
M12198
YELLOW
ORANGE
BROWN
M12200
YELLOW
ORANGE
L
ONWORKS
-BUS
BROWN
TERMINATION
MODULE TERMINATION
MODULE
DEVICE DEVICE
DEVICE
(DAISY CHAINED) (DAISY CHAINED)
DEVICE
DEVICE M12199
M12201
ORANGE
YELLOW
LONWORKS-BUS
BROWN
ORANGE
YELLOW
LONWORKS-BUS
BROWN