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 Updated: 10 May 2020


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WIRELESS CONTROL - SonNet System - Receiver Modules


RF-RX Reciever Modules

The RF-RX20 or RF-RX40 receiver collects data from all other devices on the radio network, including measurements from sensors, link quality for all links formed in the network, battery levels for all battery powered devices, hours run for all devices and the current status of all devices.








Note: Each receiver can support a maximum of 16 ‘children’, which can consist of a maximum of 8 battery powered nodes and 8 routers, or up to 16 routers if there are no battery powered nodes.






on request

A USB socket is provided for connection to a PC or laptop running the SonNet CMS software.

Receivers are available in two formats

  • RF-RX20 - 20 x 0-10Vdc analogue outputs

  • RF-RX40 - 40 x 0-10Vdc analogue outputs

  • Installation

    Technical Overview
    Routers are used to route signals from battery powered nodes and other routers to the receiver module, where the signal strength of a direct path is not sufficient for reliable communications. Data is transmitted back to the receiver at configurable time intervals, or on a configurable change in measured value. Each sensor retains these configurations if the battery becomes discharged or requires replacement.

    The sensors, routers and receiver automatically select which of the 16 transmission channels available gives the best radio network performance, taking into account both signal strength and interference levels from adjacent channels and equipment (such as Wi-Fi etc.) The sensors and routers automatically find the best path back to the receiver, which may be directly to the receiver or via “parent” routers. NB Each router can support a maximum of 16 “children”, a maximum of 8 of which can be battery powered “end devices” and a maximum of which can be 8 routers. Consideration should be given on network planning for redundancy in case of router failure or damage.


    1. Remove all packaging from the receiver

    2. Note the MAC address printed on the affixed label and note where this MAC address is installed.

    3. Mount the receiver in the required position (this will have been determined during the site survey, (see the quick start guide and manual for further details), taking care not to site the receiver behind any obstruction likely to impede the radio signal

    4. Fix the receiver to the DIN rail

    5. NB If the receiver is to be mounted in a metal enclosure, it is essential that the aerial is mounted externally. A 2m and 5m coaxial extension cable assembly is available for this option.

    6. Ensure, at a minimum, that all routers and the receiver on the radio network are powered on, and allow about 15 minutes for the network to autocommission before attempting to read values or make configuration changes.

    7. Ensure the antenna is positioned in a vertical alignment.

    8. Observe correct polarity if using a 24Vdc power supply.

    9. To power on the unit, move the power switch to the ON position.


    Radio Output:

    Frequency 2.4GHz, 16 channels, direct-sequence spread spectrum


    Compliance IEEE 802.15.4-2006

    Aerial Characteristics:

    Space: Gain 1.2dBi
    VSWR 2:1

    Data Encryption:

    AES 128

    Power Output:



    Analogue outputs:

    RF-RX20 20 x 0-10Vdc analogue outputs @10mA max. each
    RF-RX40 20 x 0-10Vdc analogue outputs @10mA max. each



    Output ranges:

    Temperature –10°C to +70°C




    RH 0% to +100%


    Setpoint 0% to +100%


    E-mail: lars@fjellcom.se     

    Phone: +46(0)31-287202

    Mobile: +46(0)706-755561



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