CM4 Four-Point Continuous Monitor
CM4 Technical Manual
G-2
G.1 Introduction
LonWorks is a communications protocol that permits peer-to-peer
communication across a network. The LonWorks protocol was
developed by Echelon
®
Corporation. Nodes can communicate directly
with each other in a peer-to-peer fashion without relying on a central
controller. Routers permit expansion of networks to include thousands
of nodes.
The Lon Network allows flexible configurations. Figure G-1 shows
some of the free topology types.
Termination
Node
Star Topology
Single Termination Bus/Line
Double Termination Bus/Line
Loop Topology
Mixed Topology
Honeywell Analytics Lon Network FTT-10
Free Topology Twisted Pair Transceiver
Peer-t-peer I/O
64 Nodes per Channel
500 meters maximum cable length per channel
3 meters maximum stub length (the distance between junction box and Model CM4)
Figure G-1. Lon Network Topology
G.2 Enabling LonWorks
In units factory-equipped with the LonWorks protocol, the LonWorks
port must be enabled prior to use.
G.2.1 Verifying the Installation
The LonWorks interface includes a recessed “service” pushbutton
and a small yellow LED.
Service LED
Service Pushbutton Access
Figure G-2. Service Button and LED Location
The pushbutton can be activated with a straightened paperclip. This
causes an identification or “service” message to be sent on the network.
The LED receives power when the pushbutton is pressed. The LED
provides an indication of the node status as shown below:
LED during power-up
Node status
one flash
Correct, node is configured.
slow (0.5 Hz) flashing
Node has become unconfigured by the network
management tool.
one flash, then on continuously The node does not have an application. The application
program must be loaded with a network management
tool.
completely dark
The ribbon cable to the CM4 CPU board is disconnected
or there is another hardware problem
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