RS-232/RS-485 to LoRa Radio Modem
The LRA-900 is a RS-232/RS-485 to radio device designed for remote communication operating in a transparent way and exploiting the physical layer of LoRa (Long Range) transmission technology. The LRA-900 provides a maximum line of sight (LOS) transmission distance of 1500 meters at an RF bit rate less than 10,000 bps. In order to overcome the interference that may be encountered in harsh environments, the LRA-900 allows the RF transmission bit rate to be configured to a minimum of 250 bps, enhancing the capability of the modem to resist noise and other interference. Additionally, the RF channels and Group IDs are adjustable, which is helpful to avoid interference encountered when two LRA-900 networks are adjacent. The RF channels and the Group IDs can be configured in order to distinguish and control the different LRA-900 networks.


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    • LoRa (Long Range) transmission technology
    • Transparent transmission mode
    • 32 RF channels (Frequency band : 864~ 871.5MHz, 915~ 922.5MHz)
    • RF baud rates: 10,000 ~ 250 bps
    • Provides baud rates from 1200 to 115200 bps for both the RS-232 and RS-485 interfaces
    • ESD protection: Contact +/-4 kV
    • Isolation: 3000 VDC for DC-to-DC, 2500 Vrms using a photocoupler
    • DIN-Rail mountable
    • Operating temperature, -25 °C ~ +75 °C

    Hardware Specifications

    RF Interface
    Radio Frequency 864~ 871.5MHz, 915~ 922.5MHz (channel: 32, recommend using 868 +/- 4 MHz)
    Baud Rate 10,000 ~ 250 bps
    Transmission Power 15 dBm (Max.)
    Antenna 2 dBi Omnidirectional Antenna
    Transmission Distance up to 1500 m (with 10,000 baud, in free field conditions)
    Group ID 0~255
    Protocols Transparent transmit
    Temporary Buffer Size 200 bytes
    Configuration Dip/Rotary switch or Utility tool
    COM Port Interface
    COM Port RS-232 x 1, RS-485 x 1
    Baud Rate (bps) 1200 ~ 115200
    LED Indicators
    Red/Green/Yellow Power/RF Tx/RF Rx Status
    Required Supply Voltage +10 VDC ~ +30 VDC
    Power Consumption 1 W (Max.)
    Dimensions (W x L x H) 108 mm x 84 mm x 33 mm (not include antenna)
    Installation DIN-Rail
    Operating Temperature -25 ~ +75°C
    Storage Temperature -30 ~ +80°C
    Relative Humidity 10 ~ 90% RH, Non-condensing

    Ordering Informations

    LRA-900 CR RS-232/RS-485 to LoRa Radio Modem (RoHS)