MODBUS: “interface for Modbus slaves”

MODBUS: “interface for Modbus slaves”

LoRaWAN / Sigfox sensor

Query, write and read one or more registers on one or more Modbus slaves

The MODBUS IoT sensor meets the needs of users wishing to interrogate one or more MODBUS slaves and send back their information via an LPWAN network.

The product uses the MODBUS Remote Terminal Unit (RTU) protocol to communicate with the slaves.

Highlights of the IoT sensor

  • RS485/RS232 compatible
  • Supervision of up to 20 slaves
  • Several periodic frames with different frequencies
  • Indicator lights for installation assistance
  • Control and supply of power to the sensor
  • Local and remote configuration
  • Compatible with KARE services
  • Available versions:
    • LoRaWAN: EU863-870 / US902-928 / AS923
    • Sigfox: RC1


What actions are carried out by the connected sensor?


  • Send new parameters or actions to be carried out to Modbus slaves


  • Reading a slave’s registers from the network
  • Write to a slave’s registrers from the network


  • Receive feedback on faults and alerts from Modbus slaves
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Description of the IoT temperature and humidity sensor

What are the technical characteristics of the connected sensor?


  • Periodic or event mode
  • 6 configurable periodic frames
  • Configurable Life Screen
  • Modbus specific help in the IoT Configurator
  • Product error, configuration error and low battery alerts
  • Pre-wired with 2 cables: 2 wires + 6 connectable wires
  • Configuration:
    • local, via a USB-C port
    • remote, via the network

General specifications

  • Dimensions: 105 x 50 x 27 mm mm
  • Case: IP67
  • Integrated fastening system: DIN rail, tube, wall mount, flange
  • Recommended operating conditions:
    • -25°C / +70°C
    • 0 to 85% RH (non-condensing)
  • Alimentation: external supply 6-30V continuous
  • lora lora alliance iot
  • Sigfox-Partner-reseaux-iot



Driver USB to download

Where does the sensor operate?

  • LoRaWAN EU863-870
  • Sigfox RC1

What is the sensor part number?

  • ARF8240AA MODBUS LoRaWAN® EU863-870
  • ARF8240CA MODBUS Sigfox RC1


Directive 2014/53/EU (RED)


  • CLASS C or CLASS A LoRaWAN as desired according to the settings
  • Product error alert, configuration error
  • Enable Word Swapfor some registers configured as alarms
  • Repeatition of an alarm at regular intervals as long as it is active
  • Test live reading and writting in a slave with the IoT
  • Standards: Directive 2014/53/EU (RED)

For further information, all the useful documents and tools relating to the COMFORT SERENITY IoT sensor:

Previous versions: to find all the documentation related to previous versions of this product, click here.

Where does the sensor operate?

  • LoRaWAN US902-928

What is the sensor part number?

  • ARF8240B MODBUS LoRaWAN® US902-928


  • US: FCC- Title  47 CFR Part 15
  • Canada: RSS-247 Issue 2

For further information, all the useful documents and tools relating to the MODBUS IoT sensor:

Where does the sensor operate?

  • LoRaWAN AS923

What is the sensor part number?

  • ARF8240J MODBUS LoRaWAN® AS 923


AS/NZS 4268

For further information, all the useful documents and tools relating to the MODBUS IoT sensor:

Our solutions for different uses

Discover our case studies for optimising the use of your buildings while improving the organisation of your services.


energy consumption

objectif, enjeux, cible règlementation

regulatory requirements


satisfaction of occupants


the building against damage

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