ABB RLON-01 [17/82] Overview

ABB RLON-01 [17/82] Overview
Overview
17
Overview
Overview
This chapter contains a short description of the LONWORKS
®
system and the RLON-01 Adapter module, a delivery checklist,
and warranty information.
The LONWORKS
®
system
The LONWORKS
®
system is an open serial communication solution
that enables data exchange between all kinds of automation
components.
A L
ONWORKS
®
network consists of intelligent devices, called
nodes, connected by one or more communications media that
communicate with one another using the LonTalk
®
protocol.
AL
ONWORKS
®
network can consist of up to 32385 nodes divided
into 255 subnets (127 nodes/subnet). Nodes are programmed to
send messages to one another in response to external events or
messages they receive. Each intelligent device, for example a
programmable thermostat in a building control system, is a
L
ONWORKS
®
node. A node is connected to other nodes with
appropriate communications media, such as twisted pair cable,
RF link, or power line circuit.
Each node includes a physical interface, transceiver that
interfaces with the communication media. The RLON-01 module
uses the FT-X1 Free Topology Transceiver (compatible with
FTT-10A transceiver) from Echelon Corporation. This is the most
commonly used twisted-pair media in building automation and this
architecture supports star, bus, and loop wiring. The FT-X1
transceiver connects to a twisted pair cable with a baud rate of
78 kbit/s and appears as a high impedance to the network when
unpowered, hence it does not interfere with the network
communications when powered down.

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