MAX485 TTL to RS485 Converter Module - (2).Programming is also simple just use the Serial.print() to write to RS-485 and Serial.Read() to read from RS-485 and the pins DE & RE of RS-485 is made LOW to receive data and made HIGH to write data to RS-485 bus. The hardware serial pins in STM32 and arduino UNO is given below. The hardware serial ports of microcontrollers are used. Using this module with STM32F103C8 and Arduino UNO is very easy. All pins of chip have been lead to can be controlled through the microcontroller.A low power consumption for the RS485 communication.For using RS-485 module with microcontrollers a module called 5V MAX485 TTL to RS485 which is based on Maxim MAX485 IC is needed as it allows serial communication over long distance of 1200 meters and it is bidirectional and half duplex has a data transfer rate of 2.5 Mbps. RS-485 Module can be connected to any microcontroller having serial port. RS-485 is faster compared to I2C protocol.Another advantage of the RS-485 is immune to the noise as they use differential signal method to transfer.Can have a maximum of 32 devices connected to RS-485 protocol.

The main advantage of RS-485 over RS-232 is the multiple slave with single Master while RS-232 supports only single slave.It transfers data up to 1200-meter maximum. It also provides maximum data transfer distance compared to RS-232 protocol.RS-485 supports higher data transfer rate of 30Mbps maximum.It provides a Half-Duplex communication when using two wires and Full-Duplex communication when using four wires.

So what is this Differential Signal Transfer Method?ĭifferential signal method works by creating a differential voltage by using a positive and negative 5V. 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.

Let’s begin by understanding the working of RS-485 Serial communication.

Arduino uno pinout serial