8.2 LONWORKS
The serial interface boards for LonWorks® networks are optional accessories for the controller
which allows the controllers to be connected directly to a LonWorks® network.
The use of these boards requires knowledge of and experience with the LonWorks® network
installation and maintenance tools.
8.2.1 General characteristics
Note: The LONTalk card is preprogrammed at the factory. Commissioning the device is
required to have proper readings when probing.
The program installed on the board may correspond to a standard LonMark® profile. The board
is programmed by the manufacturer when LonMark® profiles are used or in the field for custom
profiles.
8.2.2 Physical channels
Depending on the model, the interface boards communicate via two physical channels, TP/FT-10
and TP-RS485-39, as described in the LonWorks® literature. The LONTalk card uses an Echelon®
FTT-10 transceiver, approved for use on the TP/FT-10 channel. This channel has the following
main characteristics:
• Allows the connection of a maximum of 64 nodes for each network segment.
• The nodes can be connected without any restrictions in the topology: that is, star, ring, on
one bus only, or with any combination of these.
• Communication speed: 78,125 kbps.
• Maximum distance (Belden 85102 cable): 500m for connections between the nodes with
free topology; 2700m for bus connections with double line terminator.
8.2.3 Physical Circuit Board Layout
1. Connector to the Controller
2. Terminal block for LonWorks® network (GND, A,
B)
3. Service pin
4. Green service LED
5. Red fault LED
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