CalAmp GUARDIAN Manuel d'utilisateur télécharger pdf (Page 17)

2 SYSTEM ARCHITECTURE AND NETWORK PLANNING

This section briefly discusses network architecture (including basic network types), interfacing modems and DTE, data

protocols for efficient channel operation, addressing, and repeaters.

Guardian is designed to replace wire lines in SCADA, telemetry and control applications. The RS-232 serial port allows

direct connection to Programmable Logic Controllers (PLCs) or Remote Terminal Units (RTUs). A SCADA system is

defined as one or more centralized control sites used to monitor and control remote field devices over wide areas. For

example, a regional utility may monitor and control networks over an entire metropolitan area. Industry sectors with

SCADA systems include energy utilities, water and wastewater utilities, and environmental groups.

The Guardian is intended for use in the Industrial Monitoring and SCADA market. The range of the Guardian is

dependent on terrain, RF (radio frequency) path obstacles, and antenna system design. This section provides tips for

selecting an appropriate site, choosing an antenna system, and reducing the chance of harmful interference.

2.1 SINGLE COVERAGE AREA

In a network topology with only a single coverage area (all units can talk to one another directly), there are several

common system configurations.

The most common is for one unit to be designated as a master and the rest designated as remotes. Another system

configuration is Report-by-Exception.

2.2 NETWORK ARCHITECTURE

2.2.1 POINT-TO-POINT

A point-to-point network is the most simple of all networks, and may be used for connecting a pair of PCs, a host

computer and a terminal, a SCADA polling master and one remote, or a wide variety of other networking applications.

Figure 6 Point-to-Point Network

Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 9

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CalAmp GUARDIAN Manuel d'utilisateur Page 17