HD67814 Modbus TCP Master ↔ KNX TP industrial converter, DIN-rail

Industrial Modbus TCP master to KNX TP converter, housing type B (wide), DIN rail mount.

HD67814 allows to connect Modbus TCP slaves with KNX network (for example light switches or actuators). Converter is easy to install and configure thanks to free SW67814 software available with device.

In practice, the device acts as a robust protocol bridge between wired Modbus TCP controllers and the KNX TP bus, enabling centralized supervision and control across building or industrial automation. It is suitable for lighting, HVAC, metering and alarm forwarding, where values and commands need to flow in both directions. The wide type-B housing and DIN-rail form-factor simplify panel integration and service access. A broad operating range from −40°C to +85°C supports deployment in plant rooms, rooftops and outdoor cabinets. Triple isolation improves safety and mitigates ground loops when different power domains meet. By reducing custom gateway scripting, the converter shortens commissioning time and helps standardize projects across sites. Engineers gain a stable, repeatable way to exchange data between KNX group objects and Modbus registers without rewriting existing PLC or BMS logic.

Configuration:

Thanks to the SW67814 software on your PC you can:

• Define the parameters of Modbus TCP line
• Define the parameters of KNX line
• Define the KNX messages that the Converter can accept
• Define the KNX frames that the Converter sends through the KNX line
• Define the map of KNX byte that must be written in the Modbus TCP side
• Define the map of which Modbus TCP registers must be written in KNX messages
• Update the device

To streamline commissioning, you typically set the converter IP and KNX physical address first, then create clear mapping tables between KNX group objects and Modbus registers/coils. You can tune polling intervals and timeouts to balance responsiveness with bus load. The tool provides diagnostics that help verify reads/writes before going live, reducing mis-mapping and on-site rework. Project files can be saved and reused across similar buildings to keep naming conventions and data points consistent. The same utility handles firmware updates, keeping the installation secure and up to date. By documenting comments inside mappings, teams simplify handovers and future maintenance. This configuration method ensures predictable behavior when integrating existing KNX lines with Modbus-based meters, drives or controllers.

Characteristics:

• Up to 1440 bytes in reading and 1440 bytes in writing
• Triple isolation between KNX - Power Supply, KNX – Ethernet, Power Supply - Ethernet
• Bi-directional information exchange between KNX bus and Modbus TCP bus
• Mountable on 35mm Rail DIN

The generous 1440-byte capacity in each direction supports larger point lists and packed data frames without fragmenting signals. Hardware isolation barriers between the three domains enhance resilience against electrical noise and fault propagation. Full bidirectional exchange means Modbus values can be published to KNX and KNX commands can write back to Modbus, enabling unified control strategies. DIN-rail mounting speeds installation and replacement during service windows. The compact footprint fits crowded cabinets, while clearly labeled connectors reduce wiring errors. Together these traits improve uptime and simplify multi-vendor integrations. The result is a dependable bridge that scales from small retrofits to enterprise-wide BMS rollouts.

Specifications:

• Ports: 1x KNX; 1x Ethernet
• KNX protocol: KNX TP
• Modbus TCP protocol: Modbus TCP Master
• Data Rates KNX: 9600 bit/s
• Data Rates Modbus TCP: 10/100 Base-T Autosensing
• KNX connector: KNX Bus connector
• Modbus TCP connector: RJ45
• Power supply: 8...24VAC; 12...35VDC
• Power supply connector: 2way 5mm terminal block
• Operating temperature: -40°C to +85°C (-40°F to +185°F)
• Dimensions: 71 mm x 60 mm x 95 mm (DxWxH)
• Weight: 200g approx
• Mechanical fixing: 35mm DIN Rail montage
• Software: SW67814
• ORDER CODE: HD67814-KNX-B2

These specifications underline a balanced design: RJ45 for straightforward Ethernet hookup, a dedicated KNX bus connector for reliable TP wiring, and flexible AC/DC power to match site utilities. Autosensing 10/100 Base-T helps drop the converter into existing networks without manual link-speed settings. The extended temperature rating suits technical rooms with poor HVAC as well as outdoor enclosures. Compact 71×60×95 mm dimensions and ~200 g weight keep panel space and load to a minimum. Together with SW67814 for setup, these elements provide a repeatable, service-friendly path to connect Modbus TCP devices with KNX TP systems.

Configurator – Software SW67814 FREE DOWNLOAD

---