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# Daikin Chiller (RTU) Emulator
# EQUIPMENT_TYPE MANUFACTURER MODEL RTU
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.
## Brief Introduction
Equipment specifc details that make it different from other devices
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.
## List of Equipmentt
This cofiguration has been used for these models:
* **Model**: 09-15-22
* **Model**: 09-15-23
* **Model**: 09-15-25
## 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`.
* **Microcontroller**: [Firebeetle 2 ESP32.](https://www.dfrobot.com/product-2231.html)
* **RS485 Transceiver**: [RS485 Shield for Arduino.](https://www.dfrobot.com/product-1024.html)
---
## How to Customize for a New Chiller
## States and Strategies
Provide a brief description of what variables and strategies were used in this configuraiton
To adapt this template for a new chiller, follow these steps.
### Standby State
* **Equipment running**: set to 0
* **Common Alarm**: set to 0
* **SAT temperature**: set to 85
### 1. Configure Device-Specific Parameters (`config.h`)
### Running State
* **Equipment running**: set to 1
* **SAT temperature**: **Ramp Strategy** set to 65 deg setpoint
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.
```c++
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
### Fail State
* **Commong Alarm**: set to 1
* **SAT temperature**: **Ramp Strategy** set to 105 deg setpointset