W-BACnet module

W-BACnet replaces the cabling with a reliable wireless mesh eliminating the time-consuming installation planning, cabling, daisy-chaining and trouble-shooting.

The W-BACnet OEM Module can be integrated directly into a BACnet MSTP device in order to make it wireless. Simply connect the UART interface of the Module to your host CPU to communicate BACnet MSTP. The Module also have a SPI Slave interface for configuration, putting your device in control so the Module can be adapted to your already existing user interface.

The W-BACnet acts as a proxy for the connected BACnet MSTP device, effectively extending the bus and creating the possibility to make legacy products wireless. A W-BACnet network consists of a single W-BACnet Gateway with up to 100 W-BACnet Nodes. Connect your BACnet MS/TP controller using RS485 to the W-BACnet Gateway, and then each of your BACnet MS/TP devices with RS485 to the W-BACnet nodes.

Small Footprint

Unique reliability

External antenna

Long range

  • Mesh network – Cover an entire building, utilizing the mesh network as your infrastructure.
  • Self-optimizing network – The mesh network will always find the best way to send messages through the network between devices
  • Cognitive Coexistence – LumenRadio’s patented technology provides industrial grade reliability and immunity to interference
  • Modular configuration – you no longer need to have the same baud rate in the whole network, supports individual settings for each device
  • Small footprint at 18.5 mm x 33.5 mm
  • U.FL/IPEX external antenna connector
  • Firmware upgradeable via BLE
  • Dimensions 18.5 mm x 33.5 mm
  • Frequency band: 2.45 GHz, ISM band (2400-2483 MHz)
  • Baud rate: 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, 115200, 230400, 250000, 460800, 921600, 1000000 bps
  • Stop bit: 1, 2
  • Parity: none, even
  • Number of hops: 8 hops in the meshing network
  • Output (ERP): Max 20 dBm
  • U.FL/IPEX external antenna connector
System overview

A W-BACnet network consists of a single W-BACnet Gateway with up to 100 W-BACnet Nodes. Connect your BACnet MS/TP controller using RS485 to the W-BACnet Gateway, and then each of your BACnet MS/TP devices with RS485 to the W-BACnet nodes.

The W-BACnet network is built on LumenRadio’s MiraMesh, a self-forming and self-healing wireless mesh technology.


W-Modbus and W-BACnet update 3.0

New features

Firmware of an entire network can now be updated via FOTA from the gateway node.


Reserved modbus addresses 248 through 255 are now handled as any other address to accommodate

certain applications in the solar industry.


Fixed an issue affecting Modbus PRO units which may miss responses from devices with consecutive


Common questions

What is FOTA?

FOTA, Firmware over the Air, is a way to distribute firmware updates over the wireless network by

performing a single update on the gateway. The system is completely automated, and significantly

simplifies firmware updates in established networks.

What do I need to do?

For the initial update, each mesh and gateway node will have to be manually updated to version 3.0

in the exact same way as before. Any future update past 3.0 can then simply be deployed on the

gateway node, the update will then automatically be distributed and applied to all mesh nodes in the


What happens if I don't or can't update every single node?

Nodes that are not updated will still function as before without any breaking changes, however these

nodes will not receive new firmware until they are manually updated to at least 3.0. Nodes that

have been updated to 3.0 will still receive new firmware from the gateway, provided their connection

to the gateway is not via a node that has not been updated.

How long does an update take?

The time required depends on a lot of factors. As a general rule, allow for ca 5 minutes per node in

the network. Our largest test network consists of 100 nodes and takes ca 5 hours to fully upgrade.

Is Modbus or BACnet unavailable while firmware is updating?

No. The system is designed to be as unintrusive as possible and bus traffic will continue to operate

while firmware is being distributed over the network. You will be seeing a temporary outage in

service when the nodes are restarting with the new firmware. The restart is synchronized over the

entire network in order to minimize disruptions.

For normal operations you will be seeing a single outage for a few minutes while the network

rebuilds itself. For large (>50 devices)you may see two or more (based on the size of an update) outages.

Can I still update my network manually?

If you wish to speed up firmware updates of smaller networks by updating manually, you can still do

so by following the regular process from before 3.0. Make sure you update your gateway node first,

then update the mesh nodes.

How do I set serial settings for the W-BACnet Module?

The Module have a SPI Slave interface for configuration, please see the development documentation for further information.

Is the BACnet communication via UART to the W-BACnet Module?

Yes, UART is used for all communication between thes Module and the BACnet device. It is also support for using a RS485 driver.