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98 •
LON
Warning!
To avoid damage to or destruction of the hardware and to the software, en-
sure that the following wiring instructions are adhered to:
– Select the wire routing such that capacitive, inductive and high frequency
– Route signal and data cables separate from power cables.
– When routing cables outside of buildings, adhere to the lightning protection
4.3.2 Topology
By its various coupling possibilities, such as repeaters, routers, bridges or
gateways, LON allows a versatile network topology and a quasi unlimited
length with a maximum of 32,000 intelligent bus subscribers.
In addition, also the various transmission media, such as twisted pair, 230 V~
power cable, radio, infra-red and fibre optic cables, can be mixed.
With LON, the 230 volt supply voltage cables are routed separate from the bus
cables (except the power line). In a special way of transmission ("Link
Power") the data and the first supply voltage rate for the units are transmitted
via a common cable pair. With the transmission form "free topology" the sup-
ply voltage and the data are transmitted via separate cable pairs.
To obtain the maximum freedom when designing the networks, transceivers
for free topologies were developed. In addition to the bus structure, this allows
the architecture of ring- and star shaped networks and/or mixed topologies.
A total of 64 nodes can be connected to one bus segment.
For intended applications with a number of nodes exceeding the permissible
maximum number of 64 per channel or for which the transmission distances
are not sufficient, repeaters can be used.
Repeaters are used to refresh and amplify the bus signals. They can also be
employed for branching and tree structures, however, we recommend to ob-
serve that the number of physical repeaters which are allowed to be installed
between two communicating nodes is limited to one. As an alternative, a
router can, of course, be integrated into the network, which is not subject to
stray pick-up will not negatively affect signal transmission.
regulations! Here, amongst others, the protection of data lines against surge
voltages by means of varistors or surge arrestors is concerned. If necessary,
seek detailed consultation from your manufacturer of corresponding light-
ning and surge voltage protection systems regarding suitable components
and their application. Remember that not only the network lines are en-
dangered but also the supply voltage!
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ON
ORKS
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