Duco Modbus TCP: Technical Integration Overview

Introduction to Modbus TCP Integration

This document provides essential information regarding the Modbus TCP interface for Duco ventilation systems. It enables seamless communication between external control systems, such as Building Management Systems (BMS), and the DUCO ventilation setup via the Duco Connectivity Board.

The Modbus TCP protocol allows for the retrieval of system information through read parameters (INPUT registers) and the adjustment of settings via write parameters (HOLDING registers). This integration facilitates efficient monitoring and control of ventilation networks.

Key Features and Parameters

The Duco system supports a specific subset of Modbus TCP functions, including reading and writing multiple registers. Parameters are categorized as read-only (INPUT) or read/write (HOLDING), typically as 16-bit variables.

The document details various system parameters, such as:

• Ventilation status and settings
• Environmental data: temperatures (supply, extract, outdoor), humidity, CO2 levels, and air quality indicators.
• Filter status and remaining life.
• System identification and configuration options.

It also outlines the structure of Modbus addresses (XXyy) and provides guidance on handling specific data representations, like negative temperature values.

System Compatibility

The Modbus TCP interface is compatible with DucoBox Silent Connect, DucoBox Focus, and DucoBox Energy models, functioning via TCP over Ethernet or Wi-Fi on port 502.