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
|Power supply||External AC/DC Power adapter|
|Protocols||Modbus RTU, Wireless IEEE 802.15.4|
|Radio||2.4GHz - with External Antenna (SMA connector)|
|Case fixing type||Wall mount accesory included|
|Certifications|| UNE EN 60950-1:2007 + Corr: 2007+A11:2009+A1:2011 |
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