Both signaling types use serial communication. How an Arduino can Speak over an RS485įirst, let’s talk about Arduino and RS485.Īlthough Arduino supports serial communication through its built-in UART (Universally Asynchronous Receiver/Transmitter), it uses TTL (Transistor-Transistor Logic), not RS485. In this post, I'll talk about adding an Arduino to an RS485 network and programming it to function as a Modbus slave device. So, how can you program an Arduino to act as a Modbus device? There is a twist, however. The devices with which the PLC is communicating are Arduinos. A situation arises where you have a system that includes a PLC, an HMI, and some peripheral devices. The HMI displays some information to a user and allows for some basic control and the PLC manages data collection and communication through an RS485 network using a Modbus RTU protocol.Įasy, right? Many PLCs already support RS485 and Modbus communication and only require a few functions blocks.
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