905U-D Wireless Serial Data Modem


The ELPRO 905U-D Wireless Serial Modem is a robust, license-free serial transceiver capable of long range communications to 32km/20mile. Operating at 900MHz and up to 1W, the ELPRO 905U-D provides high-speed RS232 and RS485 connectivity up to 115kbps, which provides robust and secure two-way wireless serial communications in challenging environments typical of industrial monitoring and control applications.

Capable of high speed communications with serial devices, the ELPRO 905U-D can communicate using either transparent broadcast mode or a controlled addressed mode. Both offer node to node, node to multi-node and repeatability for greater range. Integrated forward error correction maximizes bit error rate providing greater transmission reliability and configurable DTR controlled low power mode on the RS232 port aids reduction of overall power consumption. The modem is hazardous area approved delivering strong resistance in harsh industrial environments.



  • Oil/gas field production/distribution
  • Water/wastewater to SCADA
  • Electrical metering/consumption
  • Serial transducer devices to SCADA/HMI
  • Serial data logger connectivity
  • PLC to PLC to SCADA/DCS connection
  • Conveyor belt header drums
  • Notification panels and sirens


  • 902–928 MHz frequency up to 1W RF power
  • Frequency hopping spread spectrum to 115.2 kbps
  • 50 x 250 kHz channel spacing
  • High-speed RS-232 and RS-485 data rate to 115 kbps
  • Transparent/simultaneous broadcast and addressable device messaging
  • LoS distance to 20 miles (32 kms) in a single hop; Unlimited repeatability
  • Low power consumption mode with DTR control
  • Forward error correction communications (CRC error checking with ARQ)
  • Simplistic configuration for AT Hayes commands or Windows®-based software
  • Helpful diagnostics include radio signal strength and BER Indication
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