Engo EFAN-230 Controller: MODBUS RTU Protocol Guide

This document provides a comprehensive technical overview of the MODBUS RTU communication protocol for Engo Controls EFAN-230 series HVAC controllers. It is designed for system integrators and technicians to facilitate the integration of these devices into building management systems.

The guide details the MODBUS RTU master-slave architecture, communication settings via RS-485 serial interface, and the mapping of input and holding registers. Understanding these specifications is crucial for configuring and operating the EFAN-230 controllers effectively.

Key Specifications

• Protocol: MODBUS RTU
• Interface: RS-485 serial communication
• Architecture: Master-Slave
• Functionality: HVAC control, temperature monitoring, fan speed management, system configuration
• Registers: Detailed listing of Input and Holding registers with descriptions, value ranges, and default settings.

Configuration Parameters

The document specifies various configuration parameters accessible via MODBUS, including:

• Fancoil type selection
• Input configuration for sensors and external contacts (S1-COM, S2-COM)
• ECO mode settings and temperature thresholds
• Fan control algorithms and speed settings
• Temperature switching points for heating/cooling modes
• Floor heating protection parameters
• Operation modes and security features (PIN code, key lock)

This technical guide ensures proper implementation and utilization of the EFAN-230 controllers' advanced features within diverse HVAC applications.