Echelon OpenLNS Commissioning Tool - Manual (Page 377)

OpenLNS CT User’s Guide 361
master controller. Because of the enhanced system reliability introduced by eliminating the master (a
single point of failure) and the reduced installation and configuration cost inherent in peer-to-peer
designs, L
ON W ORKS technology supports but does not require a peer-to-peer control strategy.
Physical Medium
A communication environment that carries the modulated signals from sources to destinations in a
network. L
ON W ORKS technology supports many media types, including twisted pair, power line, fiber
optic cable, radio frequencies, infrared, and coax.
Priority
An ISO/IEC 14908-1 Control Network Protocol service for messages sent from L ON W ORKS devices
that allow a message priority access to a channel. Priority traffic is delivered before other traffic.
Priority is a resource of the channel.
Protocol Analyzer
A tool that can read every packet on a L ON W ORKS channel. A protocol analyzer is different from a
device containing the complete ISO/IEC 14908-1 Control Network Protocol stack in that it can receive
every packet on the network, not just packets that are addressed to it. Protocol analyzers allow users to
observe, analyze, and diagnose the behavior of installed L
ON W ORKS networks. The LonScanner
Protocol Analyzer includes the following tools for network analysis and diagnosis:
• Packet monitor tool
• Network traffic statistics tool
• Network diagnostics tool
Recommissioning
Process in which OpenLNS CT downloads network and application configuration data into a physical
device that was previously commissioned with OpenLNS CT.
Reference Connection
An OpenLNS CT connection represented by a pair of identically named SmartShapes attached to both
ends of the connection. Reference connection SmartShapes can be used to simplify an OpenLNS CT
drawing and connect functional blocks and supernodes in different subsystems.
Remote Full Client
An OpenLNS CT computer that communicates with the OpenLNS Server running on a separate
computer over a L
ON W ORKS channel (an IP-852 or native L ON W ORKS channel). On a remote full
client, network management tasks are routed through the OpenLNS Server, but monitoring and
controlling tasks are sent directly to the network without going through the OpenLNS Server.
Remote Lightweight Client
An OpenLNS CT computer that communicates with the OpenLNS Server running on a separate
computer using an OpenLNS/IP interface. On a remote lightweight client, network management,
monitoring, and controlling tasks are all routed through the OpenLNS Server.
Repeated Service
A service of the ISO/IEC 14908-1 Control Network Protocol with which a message is sent more than
once to help ensures message delivery to the addressee(s). The message is sent with a configurable
number of retries. There is no acknowledgement from the addressee(s) that the message has been
delivered.
Reset
Network management command that stops a device application, terminates all incoming and outgoing
messages, sets all temporary settings to their initial values, and then restarts the device application. If a
device was offline, it is placed online.