Serial Communication – RS232 Basics In the, we discussed about the basics of serial communication. In this post, we will learn about the RS-232 protocol of serial communication. This is the protocol you will be using the most when involving microcontrollers like AVR. 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 • • • • • • • • • • • • • • • RS-232 Basics RS-232 (Recommended Standard – 232) is a standard interface approved by the Electronic Industries Association (EIA) for connecting 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 is the interface that your computer uses to “talk” to and exchange data with your modem and other serial devices. Cp2102 Usb To Uart Bridge Controller Driver for Windows 7 32 bit, Windows 7 64 bit, Windows 10, 8, XP. Uploaded on 4/4/2018, downloaded 8143 times, receiving a 76/100 rating by 4759 users. XpressVIP4.5 Guide Revision: 7, 14-Dec-12 Page 2 of 20 What can you find in this guide? Troubleshooting your system. The serial ports on most computers use a subset of the RS-232C standard. RS-232 protocol is mostly used over the DB9 port (commonly known as serial port), however earlier it was used over the DB25 port (also known as parallel port). We will have a look at both of them here. RS-232 over DB-9 The pin configuration of DB-9 port is as follows.
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