Irrigation & Fogging


Remote Terminal Units

Irrigation - Remote Terminal Units (RTU)

These are small units with several inputs and outputs, installed in the field at a distance of a few km from the controller. The unit is connected locally to the elements (solenoids, meters, sensors etc.), it is constantly in communication with the controller receiving operational command and transferring data back to the controller. There are 3 types of RTU:-

  1. Cable RTU (CRTU) - units communicate via cable connection.
  2. Radio RTU AP (1 way RRTU) - units can receive a signal from the main controller
  3. Radio-Gal (2 way RRTU) - units can receive and send signals to the main controller.

Cable RTU (CRTU)

The system consists of a CRTU adapter inserted into the controller, a 3 wire single cable that can be up to 6 km long along which the CRTU units are installed. A combination of units with a total of up to 128 outputs can be installed along the cable. Two such cables can be installed on one controller.

There are two basic CRTU models
  • CRTU-2: 2 Outputs - 12 VDC latching; 4 Inputs (On/Off)
  • CRTU-4: 4 Outputs - 12 VDC latching, 8 Inputs (On/Off) plus 4 Analogs - 4-20 mA or 0-10 V
  • A combination of the basic models: 6, 8, 10, 12, 14 & 16 output units are also available.
    		•  crtu
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    Radio RTU AP (1 way RRTU)

    This system transmits a radio signal from the controller to a distance of up to 5 km (depending on the field conditions), the signal is received by the radio RTU and can open or close outputs. (This unit does not include inputs).

    The system consists of:
  • Serial Transmitter (SRT): includes: 1W-RRTU adapter (located inside the controller), data cable, radio transceiver and an antenna.
  • Field Units

    • Each Field Unit Includes:-

  • 2 or 4 12 VDC latching outputs
  • A lithium battery, 3.6 VDC which lasts under field conditions up to 2-3 years
  • The unit is enclosed in 100% water proof, epoxy moulded housing
  • Each unit is loaded with its own "private" code number using a portable terminal
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    Radio-Gal (2 way RRTU)

    The controller is connected via radio to units that consist of outputs and analogs. The controller scans the units in the field via radio, transmitting the command to open or close outputs and receiving the data from the inputs and analogs. During each scan cycle the controller receives the number of pulses entered and the time (in milliseconds) between the last two pulses thus assuring that pulses can't be lost in the air.

    The system consists of:
  • Transmitting Unit: That includes an interface card inside the controller a radio transceiver and antenna
  • Field Units

    • Each Field Unit Includes:-

  • Small transceiver
  • Batteries: 2-8 x D size lithium 3.6V
  • I/O: 4 x Outputs (2 or 3 wires), 2 input, 2 analogs
  • Coding: by dip switch
    		•  2rrtu

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