Introduction
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INTRODUCTION
GENERAL
A Model 1708 or 1716 Remote Terminal Unit (RTU) is one part of a wireless SCADA
telemetry system. A SCADA system typically consists of a PC with software connected to a
Controller and one or more RTUs at multiple distant locations. The Controller and RTU are
both microprocessor controlled and, along with the user’s radio link, make up the
communications network necessary for monitoring and controlling equipment at remote sites.
The Controller is typically located at a central office and can address up to 65,535 RTUs
located at various remote sites. Using the Controller and the RTUs, the user at the central
office can control equipment or retrieve information from the remote sites.
The size of a system is dependent on airtime available and the total transmissions required.
To determine the maximum number of RTUs your system will support, call Zetron at (425)-
820-6363.
The RTU interfaces directly to a wide variety of two-way radios, either conventional or
trunking. The RTU is designed to connect to remote sensing devices that can provide dry
contact closure to ground, TTL level voltage changes or 0 to 5 volts and 4 to 20 mA for
analog measurement.
Table 1 lists the I/O capability of the Models 1708 and 1716 RTUs and the Model 1700
Controller.
i
SCADA = Supervisory Control and Data Acquisition. A general term for an industrial measurement, data
gathering, and control system.
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