Trane ZN. LonWorks control, Руководство пользователя

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Features
Wiring Communication Link
To ensure proper network
communication, follow the
recommended wiring practices
outlined in this section.
Recommended wiring practices
Follow these guidelines when
installing communication wire:
• Although LonWorks® FFT-10A does
not require polarity sensitivity,
Trane recommends keeping
polarity consistent throughout the
site.
• Do not run communication wire
alongside or in the same conduit as
230 Vac power.
• In open plenums, avoid running
wire near lighting ballasts.
• Use a daisy chain configuration.
See Figure 4. Trane strongly
recommends using a daisy chain
topology. Other topologies (branch,
star…) are much less reliable.
• Use termination resistors as
described in "Placing termination
resistors".
• Insulate termination-resistors leads.
• Use only one type of
communication wire (same
characteristics wire).
Placing termination resistors
LonWorks ® FTT-10A communication
links require termination resistors. To
correctly place termination resistors,
follow these guidelines:
• Terminate a daisy chain
configuration with a 105 ohm
resistor at the extreme end of each
wire.
• If a repeater is used, each link of the
configuration that is created by the
repeater requires termination
resistors.
Cable characteristics
Level 4 cable may be used with
TP/FT-10 channels. The level 4 cable
specification used by Echelon and as
originally defined by the National
Electrical Manufacturers Association
(NEMA) differs from the Category 4
specification proposed by the
Electronic Industries Association /
Telecommunication Industries
Association (EIA / TIA). The following
specifications can be used by cable
suppliers to identify a compliant
Level 4 cable.
6X
25 6X
26
ZN 1
6X
25 6X
26
ZN 2
6X
25 6X
26
ZN 3
Figure 4 - Daisy chain topology
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