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The IAQM-THCO2 is a IEEE 802.15.4 wireless sensor compatible with DM-124 Modbus networks. Its main role is to measure indoor air quality, specifically the temperature, relative humidity and CO2 levels.

The IAQM-THCO2 is auto configurable, which means that it adds itself seamlessly to an existing DM-124 network, acting as another link node.

Once installed, a DM-124, or more precisely the controller connected to it must interrogate the IAQM-THCO2 for its data, in the same way as the rest of Modbus devices.

Its main features are:

  • Wireless communication based on IEEE 802.15.4 (2.4 GHz)
  • Auto configurable
  • Modbus RTU wireless transmission
  • AC/DC power adapter included
  • LCD screen which shows real time sensor levels


Item Specification
Overall specifications
Power supply External AC/DC Power adapter
Protocols Modbus RTU, Wireless IEEE 802.15.4
Radio 2.4GHz - with External Antenna (SMA connector)
Physical Characteristics
Dimensions 112x112x35 mm
Material PC/ABS
Case fixing type Wall mount accesory included
Safety class IP20
Certifications UNE EN 60950-1:2007 + Corr: 2007+A11:2009+A1:2011
UNE-EN 61000-6-1:2007
UNE-EN 61000-6-3:2007
UNE-EN 55 022:2011 + Err UNE-EN55022:2011/AC
UNE-EN 55 024:2011
EN 301489-1 v1.8.1 (2008-02)

Theory of Operation

The following diagram shows the interconnection of different Modbus RTU compatible equipments through a wireless network created with the DM-124, together with a IAQM-THCO2:


The Modbus master device, which can be a PLC, a PC or an Advanticsys controller, interrogates the Modbus devices within the network. The RS485 serial packets are converted to wireless packet frames by the connected DM-124 (id 10 in the picture) and broadcasted to the rest of the DM-124 in the network, and also to the IAQM-THCO2. Whenever the IAQM-THCO2 is addressed it replies a compatible Modbus packet to the network coordinator.

The IAQM-THCO2 does not have a RS-485 interface, therefore it cannot act as coordinator of the network.

The IAQM-THCO2 can be configure with the WM Config Tool, but, as it only has a radio interface, configuration of the device must be done via radio with the use of a UD1000. Among other parameters it is possible to configure:

  • The Modbus identifier
  • The IEEE 802.15.4 radio channel, and the radio cluster identifier, allowing different networks to coexist