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2110212 Rev 1.0 Page 7
2. System Overview
Sierra Wireless’ DART 300 modem provides fast, reliable, cost effective communications for your
fixed-location data, telemetry, or SCADA application. Remote terminals are often in “out of the
way”, “hard to get to” locations. The DART 300 provides the reliability and high performance
that you demand and rely on for these mission critical systems.
Figure 2-1: DART 300 CDPD Modem
The DART 300 is a full duplex, 0.6 Watt, wireless radio modem that provides communications
over the Cellular Digital Packet Data (CDPD) network.
Its low power needs, and specific telemetry features make it the ideal solution for applications
such as water distribution and management, oil and gas distribution, electricity distribution,
electronic traffic signs, and many others. With its internal UDP and TCP stacks, it can be used
with a wide variety of remote devices and equipment.
Before beginning the integration of the DART 300 into a system, it is useful to have a look at the
system as a whole and the common project development steps to full implementation.
2.1. Typical System View
Most installations of the DART 300 are in fixed (non-mobile) locations where a device in the field
is collecting data, a meter or Remote Telemetry Unit (RTU) for example, or controlling
something, a valve or display board perhaps. Since CDPD is wireless, it can also be used in
mobile applications (although power supply may be an issue).
The unit is typically polled for data by a host system, which usually monitors or controls several
field units. In some cases the field device initiates messages based on detected events.