Last time we looked at the Raspberry Pi’s Expansion Header and its General Purpose Input/Ouput (GPIO) signals. In this Elektor .Post we’ll take a look at the Raspberry Pi’s Serial UART which can also be found on the Expansion Header.
 
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The RS-232 serial interface can be regarded as the ‘mother of interfaces’. From the early days of computers and the Internet this communication protocol has been around and — luckily — is also available on the Raspberry Pi board. A quick recap on RS-232 pin functions is given in the inset.