A remote terminal unit (RTU) is a device or system that interfaces with other equipment.
Typically, a RTU converts electrical signals from the equipment to
digital values that represent such items as the open/closed status of a
switch or valve and measurement values for pressure, flow, voltage, and
current.
By converting these electrical signals and sending the digital values
out to the equipment, the RTU can initiate control sequences such as
opening or closing a switch or valve, and setting the speed of a pump.
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