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How to connect two industrial PLCs through RS-485
RS-485, also known as EIA-485, is defined as a differential multi-point bus system; it is perfect to transmit data with high speed to ranges until 12m. One of its most important characteristics is that its twisted pair of cables reduce the noise induced in the transmission line. Multiple receivers may be connected to such a network in a linear, multi-drop bus. These characteristics make RS-485 useful in industrial control systems and similar applications.
We recommend you to read the following posts in order to understand the program of this blog. We used the following blog posts to do this example:
How to program our industrial PLC with Arduino IDE How to install Industrial Shields boards in the Arduino IDE.