RFM offers a full set of custom embedded wireless networking solutions like Zigbee wireless mesh sensor networks, RF modules, IC transceiver, IC transmitters and IC receivers. RFM, Inc. manufactures low power wireless and RF radio modules, wireless mesh nodes for distributed sensing on distributed sensor networks. Low Power radio, n../arrowband and short range devices, front end saw filters, active RFID, RFIC, coupled resonator filters, single silicon chips in the 70MHZ and 300-1000Mhz range.

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DNT900
900 MHz Frequency Hopping Module

Other top DNT900 Applications

  • Irrigation Control
  • SCADA for monitoring and control
  • Scoreboards and Electronic Sign
  • Industrial Remote Control
  • Energy Management

    * The DNT2400 has the same form factor and pin out as the DNT900 and can be used for this application in the 2.4 GHz band


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    see all DNT900 part #'s below
    High Speed Railway Crossing Gate Closing System

    Application Overview

    A Large Railway company was looking to implement a backup system for a railway crossing that would actuate the closing of the gates if the main system failed.

    The system had to detect the presence of the train a few kilometers away from the railway crossing and then relay this information to the gate actuator at the base controller. The stringent requirements for a very fast link up time, range and narrowed down the choice of radios to the DNT900

    A DNT900 radio was integrated with the sensor circuitry that was used to detect the presence of a passing training. This information was then relayed back to another DNT radio embedded into the main gate controller circuit located a few km away. Having received the information of an oncoming train, the gate controller circuit now had information to close the gate in case of failure of the main system.

    Applicable Product Features

    The DNT900’s fast link up times, high power, ability to transmit over long distances reliably and API designed for easy system integration made this the radio module of choice for this application.

    SPECIFICATIONS

    Radio Characteristics:
    Frequency:
    Transmit Power:
    RF Data Rates:
    Receiver Sensitivity:

    Data Encryption:
    Network:

    Environmental:

    Power Supply:
    Dimensions:

    Mounting Option:
    RF Connection:
    Input /Outputs:
    Interface:
    Certification:     		FHSS (Frequency Hopping Spread Spectrum)
    902.75 – 927.25 MHz
    up to 1 W selectable
    38.4, 115.2, 200, 500 Kbps
    -108 dBm 10-5 BER at 38.4 Kbps
    -94 dBm 10-5 BER at 500 kbps
    AES-128
    Point to Point, Point to Multipoint, Peer-to-Peer, Tree
    routing
    -40 °C to +85 °C
    10 - 90% humidity, non-condensing
    3.3 to 5 VDC
    2.01 x 1.26 inches (52.07 x 32.00 mm) for DNT900C
    2.05 x 1.36 inches (52.07 x 34.54 mm) for DNT900P
    Pinned and Surface Mount Versions
    U.FL Coaxial Connector
    6 GPIO, 3 ADC and two DAC outputs
    UART, SPI
    FCC, Canadian IC certified

    HOW TO BUY
    RFM products are sold through a world-wide network of manufacturer's reps and distributors. Go to the RFM website at www.RFM.com and visit the "How to Buy" section to locate a sales / distribution partner near you.

    Part Number Description
    DNT900P DNT900 FHSS Module - Pinned Version
    DNT900C DNT900 FHSS Module – Surface Mount
    DNT900DK DNT900P FHSS Module - Developer's Kit