Planning LION System
EN1Z-0921GE51 R0315
12
LONWORKS Bus Cables
Cable type Max. bus length
Belden 85102 (plenum) 2700 m (8900 ft)
Belden 8471 (non-plenum) 2700 m (8900 ft)
Level IV, 22 AWG 1400 m (4600 ft)
JY (St) Y 2 x 2 x 0.8 900 m (3000 ft)
TIA568A Cat. 5 24AWG, twisted pair 900 m (3000 ft)
Table 18 Doubly-terminated bus specifications
NOTE: The above-listed cable types are as
recommended by Echelon in their FTT-10A User
Guide.
NOTE: CentraLine recommends the use of level IV,
22 AWG, solid core, non-shielded cable.
NOTE: Belden part numbers are 9H2201504 (plenum)
and 9D220150 (non-plenum).
FTT Specification
The FTT specification includes two components that must
be met for proper system operation:
The distance from each transceiver to all other
transceivers and to the termination must not exceed the
max. node-to-node distance.
If multiple paths exist, the max. total wire length is the
total amount of wire used.
Cable type
Max. node-to-
node distance
Max. total wire
length
Belden 85102 500 m (1650 ft) 500 m (1650 ft)
Belden 8471 400 m (1300 ft) 500 m (1650 ft)
Level IV, 22AWG 400 m (1300 ft) 500 m (1650 ft)
JY (St) Y 2 x 2 x 0.8 320 m (1050 ft) 500 m (1650 ft)
TIA568A Cat. 5
24AWG, twisted pair
250 m (825 ft) 450 m (1500 ft)
Table 19 Free topology (singly-terminated) specifications
NOTICE
Unpredictable reflections on the bus due to step change
in line impedance characteristics!
► Do not use different wire types or gauges on the same
L
ONWORKS network segment.
NOTE: In the event that the limit on the total wire length
is exceeded, the FTT physical layer repeaters
(FTT 10A) can be added to interconnect seg-
ments. This increases the overall length by an
amount equal to the original specification for that
cable type and bus type for each repeater used.
For example, adding repeaters for a doubly-
terminated bus using JY (St) Y 2 x 2 x 0.8 cable
increases the max. length by 900 m (3000 ft) for
each repeater.
Field Device Cables
Type of signal
Cross-sectional area
100 m (300 ft)
(Fig. 39 on p. 28)
one transformer
400 m (1300 ft)
(Fig. 40 on p. 28)
separate
transformers
24 VAC power
1.5 mm
2
(16 AWG)
not allowed for
> 100 m (300 ft)
0…10 V signals 0.081 – 2.08 mm
2
(28 – 14 AWG)
Table 20 Cable sizing for connection of field devices
For wiring field devices see page 28.
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