What is the difference between RS-485 serial and Modbus™?
Strictly speaking, RS-485 (or formally EIA-485) is an electrical standard, but more commonly, RS-485 serial communication refers to using the electrical standard to send data between devices on a serial network bus, where each device can be separately addressed and where all the devices communicate using a given transmission format. Modbus™ is a specific standard for a transmission format that may (or may not) be implemented by the devices on the serial network bus, depending on the device manufacturers’ implementation of RS-485 serial communication.
