The new software is ready to run on an STM32* MCU or the BlueNRG-2 Bluetooth Low Energy SoC that uses the Arm Cortex-M0 core operating at 32MHz. The software features a certified KNX-RF stack, RF adaptation layer, and the S2-LP library required for connecting the transceiver to create an ultra-low-power wireless KNX node. S2-LP operates in the 868.3MHz band at only 10mA with +10dBm output, providing secure and robust wireless connectivity, while extending battery run-time.
Using the S2-LP radio and BlueNRG-2 SoC together provides a hybrid and low-power optimized KNX/Bluetooth solution in two chips. This combination allows a smartphone to access KNX-based networks and provide an interface for monitoring, controlling, configuring, provisioning, and updating the KNX nodes.
The software meets the latest KNX-RF Multi specification, which adds support for secure (S mode), encrypted communications and frequency agility. The specification uses five channels to avoid interference and allow fast and slow communication modes to save power. KNX-RF Multi boosts reliability and allows greater numbers of KNX devices to coexist on the network, including listen before talk (LBT), fast acknowledge with auto-retry, and support for repeaters.
ST partnered with Tapko for the certified KNX stack and Actimage for the RF adaptation layer.
ST will present demonstrations of the new software during the KNXperience online tradeshow running from September 28th to October 2nd. The demonstrations will show the KNX RF Multi software package using legacy KNX-TP and ETS to configure and control light switches, adjust LED color and dimming, and setup KNX devices with a smartphone connected through the BlueNRG-2 Bluetooth SoC.