Rev.01 03-27-17
Page 53 of 71
Compu-Aire
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
Figure 48 - LONTalk Card
Note: The ground wire (GND) is not requires in some application.
