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4      How to Choose the Right Antenna


        Point to Point




        Two data radios are communicating to one another. Wirw replacement
        systems or serial to serial communication. Always, yagi antennas on both
        ends provide the best signal strength and prevent interference.


        PROVIDE A CLEAR LINE OF SIGHT














              SLAVE                                                                      SLAVE


        Point to Multipoint


          In a Modbus configuration we will use an Omni fiberglass antenna connected to an
          RTU through a radio modem acting as Master receiving from different I/O nodes
          acting as slaves using yagi antennas



         PROVIDE A CLREAR LINE OF SIGHT
















             SLAVE                                                                        SLAVE












                                                        MASTER
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