BRTSys Long Distance Sensor Bus (LDSBus) was designed specifically to solve the issues of sensor and actuator density, power, speed and reach. These are essential success factors and pain points that can thwart IoT deployment. LDSBus devices communicate at 230K Baud over distances up to 200m and accommodate up to 126 devices on a single bus. The bus is managed by a single master called the LDSBus host and the host powers the bus and all devices attached to it. It also manages all communications on the bus.
LDSBus host software is made available in the form of LDSBus Software Development Kits with Python and C# language support. The SDK is full of sample applications that demonstrate how to read sensors and control actuators with ease.
Start with a single LDSBus device or a group of them and we have you covered with a sample application for each of them.
The SDKs are designed and tested to run on Windows PCs, Linux desktops, Raspberry Pi 3 and 4 embedded systems and Raspberry Pi 2040 systems, such as the Bridgetek IDM2040 Intelligent Display module.
Download and start developing your own LDSBus Host today. An LDSBus USB adapter is required for communication with the LDSBus devices. An exception is the IDM2040 Intelligent Display module that comes with a built-in LDSBus master port.
The LDSBus uses standard RJ-45 and RJ-11 connectors to simplify build-out of the backbone and sensor and actuator network. The backbone is built using Cat5 or Cat6 cable segments which are joined together via Quad T-Junctions and segments may be split into multi-level tree and branch network. The Quad T-Junctions provide an interconnection point for up to 126 LDSBus devices into the backbone. Both power and data are carried over these connections. The furthest device on a leaf segment is limited to 200m from the host.
Whether you require temperature or air quality monitoring in the home or pH monitoring in the pool or automatic garage door control or weather station or aquarium, there is a LDSBus device and software sample that meets your need. LDSBus devices may be DIN-rail mounted or secured into your own enclosure.
There are a few different ways to connect to the LDSBus sensors as per below:
The LDSBus Python SDK and the LDSBus .Net SDK run on Microsoft Windows to form a LDSBus Host. A LDSBus USB adapter is required to communicate with LDSBus devices. Add as many LDSBus USB adapters as required to create your LDSBus system.
The LDSBus Python SDK runs on embedded Linux platforms such as the Raspberry Pi 3 and Pi 4. A LDSBus USB adapter is required to communicate with LDSBus devices. Add as many LDSBus USB adapters as required to create your LDSBus system.
The LDSBus can be hosted from a Raspberry Pi 3/4 running the LDSBus SDK. The Raspberry Pi connects to the LDSBus via the LDSBus USB Adapter. An SDK is available for Python along with a wide range of examples demonstrating how to communicate with the sensors and actuators.
The LDSBus Python SDK runs on bare-metal Raspberry Pi RP2040 embedded systems that support CircuitPython. One such system is the IDM2040 7” Intelligent Display module which comes built-in with an LDSBus host port and is ideal for local display of sensor parameters and actuator control.
The Long-Distance Sensor Bus (LDSBus) Python SDK provides a software library to allow users to interface with LDSBus devices and integrate these into custom applications via an LDSBus USB Adapter.
Description
The LDSBus Python SDK is available on Microsoft Windows 10/11, Ubuntu 20.04, Raspberry Pi 3 and Pi 4 and Raspberry Pi Pico platforms. The LDSBus Python SDK implements the LDSBus host that manages and controls LDSU devices on the LDSBus.
The SDK enables users to roll out their own custom IoT applications quickly and easily, whilst providing fully featured API functions to enable users full control over their LDSBus devices. The SDK includes a wide variety of demo samples to interface with and control all the currently available LDSBus sensors and actuators and is being continually updated and expanded. Please see the user guide for more information on the SDK functionality.
The Long-Distance Sensor Bus (LDSBus) .Net SDK provides a software library to allow users to interface with LDSBus devices and integrate these into custom applications via an LDSBus USB Adapter.
Description
The LDSBus .Net SDK is available on Microsoft Windows 10/11 [x64] platforms. The LDSBus .Net SDK implements the LDSBus host that manages and controls LDSU devices on the LDS bus.
The SDK provides API functions to allow users to list available LDSBus Devices, initialise devices, obtain device descriptors, retrieve sensor data for applicable LDSBus Devices, and retrieve system logs. Please see the user guide for more information on the SDK functionality.
The Long-Distance Sensor Bus (LDSBus) Configuration Utility enables the configuration, calibration, and communication with LDSBus devices to be connected to an LDSBus host system.
Description
The LDSBus configuration utility provides a wide variety of features to users, predominantly focused on preparing devices for deployment by assigning their LDSBus address, configuring their termination settings (on/off) and changing devices default names to a user defined name (e.g., Swimming pool pH Sensor).
The utility also allows user to calibrate applicable sensor adapters and probe sets, whilst providing function to update devices with the latest available firmware. It is possible to scan the bus for attached devices and to view detailed information about any LDSBus device, and the current device status.
A Command console is included allowing users to read/write device registers and to send and receive data packets to attached devices where necessary. The LDSBus Configuration utility provides users with complete control over their LDSBus and associated devices.
LDSBus 4in1 Sensor Datasheet Release Date : 11 Sep 2023 
LDSBus CO2 Sensor Datasheet Release Date : 5 Feb 2024
LDSBus Air Quality Sensor Datasheet Release Date : 17 Apr 2024
LDSBus Gas & True VOC Sensor Datasheet Release Date : 26 Feb 2026
LDSBus DO Sensor Adapter Datasheet Release Date : 26 Feb 2026
LDSBus EC Sensor Adapter Datasheet Release Date : 26 Feb 2026
LDSBus ORP Sensor Adapter Datasheet Release Date : 26 Feb 2026
LDSBus pH Sensor Adapter Datasheet Release Date : 26 Feb 2026
LDSBus Salinity Sensor Adapter Datasheet Release Date : 23 Jan 2026
LDSBus Thermocouple Sensor Adapter Datasheet Release Date : 23 Jan 2026
LDSBus Modbus/SDI-12 Sensor Adapter Datasheet Release Date : 24 Oct 2024
IoTPortal Gateway Datasheet Release Date : 4 Sep 2024
LDSBus RFID Reader Datasheet Release Date : 24 Aug 2023
LDSBus Quad T-Junction Datasheet Release Date : 11 Sep 2023
LDSBus Quad T-Junction 2 Datasheet Release Date : 29 Aug 2024
LDSBus USB Adapter Datasheet Release Date : 23 Jan 2026
LDSBus Configuration Utility Release Date : 31 Dec 2025 
LDSBus Python SDK v3.1.0 Release Date : 17 July 2023
LDSBus Python SDK v3.0.0 Release Date : 17 March 2023
LDSBus Python SDK V3.1.0 Guide Release Date : 22 Sep 2023
LDSBus Python SDK V3.0.0 Guide Release Date : 5 Apr 2023
LDSBus .Net SDK V3.0.0 Guide Release Date : 22 Sep 2023
Modbus Sensors and Actuators
Our wide range of Modbus RTU sensors and actuators provide sensing and control of your devices. Mix and match the sensors, sensor adapters and actuators to meet your application requirements.
Modbus to LoRaWAN Bridge
Each LoRaWAN bridge connects up to 16 Modbus RTU sensors and actuators via long-range CAT5e daisy-chaining, delivering power and data through a single cable—no batteries required for easy setup.
LoRaWAN Gateway
Gateways provide long-range wireless links to indoor and outdoor bridges, with easy onboarding and scalable multi-site deployment. Available in both indoor and models.
BRTSys IoTPortal Cloud
Each gateway connects to IoTPortal Cloud via site-specific internet, enabling centralized storage, processing, and full remote system control.
IoTPortal on Web + Mobile
Configure, monitor, and control your system remotely via smartphone app or browser dashboard—powered by IoTPortal’s zero-code, wireless interface.
LoRaWAN Brochure Release Date : 30 Oct 2025
RAK7289 WisGate Edge Pro V2 Datasheet Release Date : 24 Oct 2025
RAK7268 WisGate Edge Lite 2 Datasheet Release Date : 24 Oct 2025
RAK7431 WisNode Bridge Serial Datasheet Release Date : 24 Oct 2025
IoTPortal-LoRaWAN Getting Started Guide Release Date : 23 Oct 2025
Modbus Configuration Utility User Guide Release Date : 23 Oct 2025
BRT Systems have now extended our range of sensors and actuators to include Modbus versions, meaning you can connect them directly to your existing Modbus networks via our Modbus cable adapter.
Modbus is a popular communications protocol used in building management, industrial/automation, agriculture/aquaculture and a whole host of other industries. Connect up to 32 sensors and actuators per bus segment, via a 2-wire RS485-based network in a daisy-chained arrangement at distances up to 1200m (approximate depending on cabling).
Enhance your smart building by connecting our range of Modbus sensor and actuator devices to the existing Building Management System (BMS) or Modbus gateway.
Modbus Configuration Utility
Our Modbus Configuration Utility provides fast and easy configuration of your Modbus devices, setting parameters such as address*, baud rate*, termination*, and allowing reading/writing of device registers* to verify that the sensor/actuator is functional. It also provides firmware update and device-specific features such as calibration functions. Connect your Modbus device to a USB port on your computer using a USB-RS485 converter to carry out configuration. Refer to our Modbus Configuration Utility and User guide for details.
*Note that you can also use 3rd party Modbus utilities to set these parameters.
Modbus 4in1 Sensor Datasheet Release Date : 14 Oct 2025
Modbus 4in1 Sensor 產品規格表 (中文) Release Date : 16 Oct 2025
Modbus CO2 Multi-Sensor Datasheet Release Date : 8 Aug 2025
Modbus CO2 Multi-Sensor 產品規格表 (中文) Release Date : 11 Aug 2025
Modbus Gas & True VOC Sensor Datasheet Release Date : 9 Jul 2025
Modbus Gas & True VOC Sensor 產品規格表 (中文) Release Date : 31 Jul 2025
Modbus DO Sensor Adapter Datasheet Release Date : 9 Jul 2025
Modbus DO Sensor Adapter 產品規格表 (中文) Release Date : 31 Jul 2025
Modbus EC Sensor Adapter Datasheet Release Date : 9 Jul 2025
Modbus EC Sensor Adapter 產品規格表 (中文) Release Date : 31 Jul 2025
Modbus ORP Sensor Adapter Datasheet Release Date : 9 Jul 2025
Modbus ORP Sensor Adapter 產品規格表 (中文) Release Date : 31 Jul 2025
Modbus pH Sensor Adapter Datasheet Release Date : 9 Jul 2025
Modbus pH Sensor Adapter 產品規格表 (中文) Release Date : 31 Jul 2025
Modbus Salinity Sensor Adapter Datasheet Release Date : 9 Jul 2025
Modbus Salinity Sensor Adapter 產品規格表 (中文) Release Date : 31 Jul 2025
Modbus Thermocouple Sensor Adapter Datasheet Release Date : 9 Jul 2025
Modbus Thermocouple Sensor Adapter 產品規格表 (中文) Release Date : 31 Jul 2025
Modbus 2CH Relay & 2CH Relay + iSENSE Datasheet Release Date : 23 January 2026
Modbus 2CH Relay & 2CH Relay + iSENSE 產品規格表 (中文) Release Date : 31 July 2025
Modbus 2CH NL Relay & 2CH NL Relay + iSENSE Datasheet Release Date : 25 July 2025
Modbus 2CH NL Relay & 2CH NL Relay + iSENSE 產品規格表 (中文) Release Date : 31 July 2025
Modbus 4CH Solid State Relay Datasheet Release Date : 9 July 2025
Modbus 4CH Solid State Relay 產品規格表 (中文) Release Date : 31 July 2025
Modbus Isolated IO Controller Datasheet Release Date : 31 July 2025
Modbus Isolated IO Controller 產品規格表 (中文) Release Date : 4 August 2025
Modbus Trailing Edge Light Dimmer Datasheet Release Date : 31 July 2025
Modbus Trailing Edge Light Dimmer 產品規格表 (中文) Release Date : 4 August 2025
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