Installation guide

Buss Rules and Limitations
In a doubly terminated bus topology, two (105 ohm resistors) terminations are required, one at each
end of the bus. Control Panels connected to the bus must not have more than a 3-meter stub length.
The Lon-Talk Serial adapter is just another node on the network so it can be located anywhere on the
bus. Doubly terminated bus confgurations do not have a maximum node-to-node distance, so you
could have one controller 1,000 meters away from 10 controllers in another area of the building. The
same rules apply to bus terminations as there are only 63 devices allowed per segment. At this time
the cable is fully loaded, to expand it a repeater must be added.
Double Terminated Bus Specications
Maximum bus length for segments with Free topology
transceivers wired as double terminated bus.
Belden 85102
2700 meters
Belden 8471 2700 meters
Level V,22AWG 1400 meters
JY (St) Y 2x2x0.8 900 meters
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REV 2.0