RS422 is an improved version of RS232 used on Apple computers, it uses twisted pair cable to reduce the noise, and it uses signal balancing to transmit data.Note that RS-422/RS-485 interface is not available on most IBM Pcs. RS232 can transmit up to 1Mbps with maximum distance up to 50 ft, but some RS-232 boards devices are limited to 115.2 kbps.RS-232 also uses a Full-Duplex transmission method. RS-232 only allows for one transmitter and one receiver on each line.RS-232 is the most common serial interface used on most Windows-compatible desktop computers. RS232 was first introduced in 1962 by IBM.Here we are not going in depth but getting overview of all these protocol and their difference. This article will be addressing this question in specific. I have seen many times that students of embedded field are confuse among RS-232, RS-422 and RS-485 protocol.
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