DDM18SD Pin Description Interfacing Arduino with DDM18SD using Modbus RTU protocol (The project) The DDM18SD energy meter is widely used in power distribution and management systems in industries such as manufacturing, data centers, and commercial buildings. It also has a built-in RS485 communication port that allows for easy integration with industrial automation systems. The energy meter is easy to install and supports both single-phase and three-phase systems. It has a compact design with a backlit LCD display that shows real-time energy consumption data in kilowatt-hours (kWh). The DDM18SD Energy meter is a Modbus RTU (RS485) enabled energy meter used to measure and monitor electrical energy consumption in industrial and commercial settings. MAX485 Pin Description DDM18SD Energy meter Low cost: The chip is affordable and readily available in the market, making it a popular choice for many electronics hobbyists and professionals.High data rate: The chip can operate at a maximum data rate of 2.5Mbps, which makes it suitable for applications that require high-speed communication.Long communication distance: The MAX485 chip can handle long communication distances of up to 4000 feet, which makes it ideal for use in industrial automation and communication applications.Low power consumption: The MAX485 chip has a low power shutdown mode which can help to conserve power in applications where power consumption is critical.The chip is also affordable and readily available in the market, making it a popular choice for many electronics hobbyists and professionals alike. The MAX485 chip is widely used because it is easy to use and can handle long communication distances of up to 4000 feet. The chip has a low-power shutdown mode and can operate at a maximum data rate of 2.5Mbps. The MAX485 chip is designed to convert the RS485 signal to TTL signal that can be understood by microcontrollers like Arduino. The MAX485 is a popular RS485 to TTL converter chip that is used in many industrial automation and communication applications. How to interface Arduino with RS485 (Modbus) protocol with example code.If you want to read more about RS485 and Modbus protocol, please visit the link below: In the Modbus RTU protocol, data is transmitted in a binary format over a serial communication link using the RS485 interface. The protocol is based on the master-slave architecture, where the master initiates the communication and the slave responds to the master’s requests. Modbus RTU is a serial communication protocol that was developed by Modicon in 1979. Finally, we will build a real-world project that will read voltage, current, and power factor values from a Modbus RTU (RS485) enabled Energy meter (DDM18SD) and print it to the serial monitor of Arduino IDE. We also need to write an Arduino code using the Modbus master library to communicate with the Modbus RTU (RS485) sensor. To interface an Arduino with a Modbus RTU (RS485) sensor, we will use an RS485 to TTL module (MAX485) to convert the RS485 signal to TTL signal that can be understood by the Arduino. In this tutorial, we will explore how to interface an Arduino as a master with a Modbus RTU (RS485) sensor as a slave device. The protocol is widely used because it is robust and easy to implement. Modbus RTU (RS485) is a popular communication protocol used in industrial automation applications for communication between devices.
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