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Showing results for tags 'standards in communication'.
Standards Once apon a time in the 'good old days' there was a standard to ease interfacing of different equipment together. It was called 'RS-232' for simple and effective serial interfacing. The voltage was a given always a -12 to +12 volt swing, a safe voltage with reasonable noise immunity. Then one fine day in order to reduce parts count it was implemented as 0 to +12 volt. Still almost as good and cheaper. As terminals became PC's the parts count was reduced so the readily available 0 to +5 volt was used as a power source. Not quite as good but even less expensive. T