![]() Modbus has 255 function codes and there are mainly three popular versions of Modbus: ![]() And apart from this, the Modbus is also used in Healthcare, Transportation, Home Automation etc. Modbus are mostly used in PLCs (Programmable Logic Controllers). In this MAX485 Arduino project, we will use Arduino Uno as Slave for serial communication. In RS-485 Modbus network there is one Master and 127 Slaves each with unique address from 1 to 127. It is divided into two parts such as Modbus Master and Modbus Slave. It should be noted that Modbus is a software protocol and not a hardware protocol. RS-485 Modbus uses RS-485 for transmission lines. Modbus is a Serial Communication protocol which was discovered by Modicon in 1979 and it is used for transmitting data over serial lines between the industrial electronic devices.
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