The serial ports on most computers use a subset of the RS-232C standard. RS-232 is the interface that your computer uses to “talk” to and exchange data with your modem and other serial devices. In other words, RS-232 is a long established standard that describes the physical interface and protocol for relatively low-speed serial data communication between computers and related devices.
RS-232 (Recommended Standard – 232) is a standard interface approved by the Electronic Industries Association (EIA) for connecting serial devices. As we proceed ahead in this post, we will deal with the concept of level conversion and towards the end, we have something interesting and practical for you – the loopback test! Contents This is the protocol you will be using the most when involving microcontrollers like AVR. In this post, we will learn about the RS-232 protocol of serial communication. In the previous post, we discussed about the basics of serial communication.