![]() It uses a technique called differential signal to transfer binary data from one device to another. RS-485 is an asynchronous serial communication protocol which doesn’t require clock pulse. Let’s start by understanding the working of RS-485 Serial communication. A 10k potentiometer is used to vary the ADC values at Master Arduino. In this tutorial, we will learn about RS-485 Serial communication between two Arduinos and then demonstrate it by controlling the brightness of the LED connected to a Slave Arduino from Master Arduino by sending ADC values through RS-485 Module. And they are most commonly used in electrically noisy industrial environment. The main advantage of RS-485 is the long distance data transfer between two devices. Now there is another serial communication protocol called RS-485.This Protocol uses an asynchronous serial communication. In the previous tutorials we have learned about I2C communication protocol and SPI Communication protocols in Arduino. It is important because the overall performance of any embedded application depends on communication means as it is related to cost reduction, faster data transfer, long distance coverage etc. Choosing a communication protocol for communication between microcontrollers and peripheral devices is an important part of embedded system.
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