RTUs are small units with several inputs and outputs. They are installed in the field within a few kilometers from the controller. Each unit is connected locally to solenoids, meters, sensors, and other elements. Each RTU is in constant communication with the controller; receiving operational commands and transferring data back to the controller.
A system can consist of a CRTU adapter inserted into the controller, a 3-wire single cable (that can be up to 6 km/3.7 miles long) along which CRTU units are installed. Another option is a combination of units with a total of up to 128 outputs installed along the cable. Two such cables can be installed on one controller.
4 Inputs (On/Off).
8 Inputs (On/Off)
4 analogs – 4-20mA or 0-10V
The radio RTU AP is a one-way RRTU system that transmits a radio signal from the controller over a distance of up to 5 km/3.1 miles (depending on the field conditions). The radio signal is received by the radio RTU that can then open/close outputs.
|Serial Transmitter (SRT)||1W-RRTU adapter (located inside the controller); data cable; radio transceiver; an antenna.|
|Field Units||2 or 4 12 VDC latching outputs
Lithium battery; 3.6 VDC (lasts up to 2-3 years under field conditions)
100% waterproof enclosure
Epoxy molded housing
Each unit is loaded with its own “private” code number using a portable terminal
Gal2Way controller is connected via radio to units consisting of outputs, inputs and analogs. The controller scans the units in the field via radio and transmits the command to open or closed outputs. It receives the data from the inputs and analogs. The controller receives during each scan cycle the number of pulses entered and the time (in milliseconds) between the last two pulses. This ensures that pulses will not get lost.
The Gal2Way features the latest radio technologies that enable the user to create wide network of Gal2Way with the capability to command field elements like valves and pumps and to collect data from meters and sensors.
The Gal2Way is a plug and play system with license free radios that feature frequency hopping and automatic routing ensuring reliable and robust communication.
Gal2Way is using sophisticated high efficiency radio unit that provides long battery operation, up to 2 years (dependent on use) without the need for solar panel.
|Consentrator||Interface card (located inside the controller);
radio transceiver; an antenna.
|Field Units||Small transceiver
4 x 1.5 D alkaline battery
I/O: 4 or 8 outputs (2 or 3 wires), 4 inputs, 3analogs
|Specification||Radio System:· Wide area star network.· 1.25 Mile/2 Km coverage radius, extended by relays to a range of 3.1 Mile/ 5 Km.· 433MHz, 868MHz and 915MHz version for world-wide coverage.
· GFSK modulation, 25kHz deviation, 50kbps.
· Self-healing technology ,frequency hopping spread spectrum provides robust communication.
· Two-way, time-synchronized, time-slotted traffic.
· TDMA system provides high capacity and low latency.
· Smart antenna diversity for enhanced link performance.
· Regulation of transmitting power.
All Galileo models are equipped with a 24-keys keyboard and a display console consisting of a wide 25-row LCD display. All types of programming can be performed by the console. There are three options for installing a console in the controller casing: at the front door, on top, or at the bottom of the casing.
The RAM is backed up by a lithium battery, installed on the main card (cpv) that lasts for at least 5 years. This ensures that data is not lost even in case of power failures.
There are two options to choose from for communication ports: a RS-232 port output for communication with a remote PC, or a RS-485 port for connection to an expansion unit (or EC/pH monitor).
Galileo systems can also include a powerful central PC. Connecting the controllers to the PC has many advantages. It enables remote control which allows users to conduct tasks from the comfort of their office instead of outside in the field or greenhouse. Several Galileo units can be connected to one computer, allowing central control of a very large area from a single location. Graphic presentation on the PC enables online display of the field including all active elements. System status and other information are displayed in user-friendly way.
The PC can also collect a variety of data types, including valve accumulations, water meters, water meter flow rates and irrigation information. Many types of reports and graphs can be displayed. These reports can be set for parameters, ranging from a single hour up to a full year. The system also supports highly specialized reports, e.g., reports of fertilizer elements such as nitrogen, phosphorus or potassium per valve. Data can be exported to an Excel data sheet for further analysis.
There are several ways that communication with the central computer can take place:
- Direct connection via a cable.
- Long distance cable via a L485 cable modem (up to 4 km/2.4 miles); enabling controller networks.
- Cellular modem (including GPRS).
- Radio communication with a range of up to 5 km/3.1 miles (additional range can be achieved via repeaters).
Galileo includes several types of software applications running on Galileo hardware. The type of application depends on the nature of a project. Galcon’s Galileo applications consist of open field irrigation, greenhouses, irrigation, climate, and nursery irrigation software.