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RobertJDavis aa204e615e PHX3 uploading to EPMS devices

Changed "SEL_2440 (MVG)" to "SEL_2440_MVG" so device can load onto Arduino.
Uploaded existing EPMS code to PHX3 EPMS Arduinos.
Changes to run status bit of UMAS CRAH.
Modified a few PHX3 VFD ACH580 registers from HR to HR_10x.

2025-11-06 17:40:55 -07:00

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Daikin Chiller (RTU) Emulator

This project is an Arduino-based emulator for a Daikin Chiller unit, communicating over Modbus RTU. It is designed to be a flexible template that can be adapted to simulate different types of chillers by modifying the configuration and state logic.

The emulator operates on a state machine with three core states:

Standby: The chiller is idle but ready.
Running: The chiller is active and operational.
Fail: The chiller has encountered a fault condition.

Features

Modbus RTU Communication: Emulates a Modbus slave device.
State Machine Logic: Simulates different operational states (Standby, Running, Fail).
Dynamic Value Simulation: Uses "Strategies" (e.g., PID, Ramp) to generate realistic, changing values for Modbus points.
Configurable Modbus Map: The entire Modbus register map is defined in a single, easy-to-modify file (config.h).
Extensible Design: The structure allows for the addition of new states and behaviors.

Hardware Prerequisites

The code is written for an ESP8266/ESP32-style microcontroller with WiFi capabilities and at least one hardware serial port for RS485 communication.

Microcontroller: ESP8266, ESP32, or similar.
RS485 Transceiver: A module like the MAX485 to interface with the Modbus RTU bus.

Software Dependencies

This project relies on a Modbus library. Ensure you have the correct library installed in your Arduino IDE.

Modbus Library: The code uses a library that provides ModbusRTU.h and optionally ModbusIP_ESP8266.h.

How to Customize for a New Chiller

To adapt this template for a new chiller, follow these steps.

1. Configure Device-Specific Parameters (`config.h`)

Open CH_Daikin_AWV026B_RTU/config.h. This is the main file for device-specific settings.

Modbus RTU Settings

Update the following constants for your device's serial communication setup.

const int BAUDRATE = 19200;   // The serial communication speed
const int RX_PIN = 17;        // The GPIO pin for receiving data (RX)
const int TX_PIN = 16;        // The GPIO pin for transmitting data (TX)
const int RST_PIN = 4;        // The GPIO pin for RS485 direction control
const int MODBUS_ID = 1;      // The unique slave ID for this device

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