Abstract
This chapter discusses various aspects of a data communication system. There are three basic parts to every data communication system that include the code, the voltage standard, and the protocol. The most common code used in data acquisition systems in the 1980s was the hexadecimal. It is found that as data rates increased and the users needed to send more data, designers changed to the American Standard Code for Information Interchange (ASCII) code in the nineties. It is observed that when the transistorized differential amplifier was developed, the range and speed of data communication increased tremendously. RS-232 uses a single ended grounded method that is very susceptible to noise, and this limits its speed and distance. RS-422 and RS-485 use a differential system that is more resistant to noise and therefore, can send data faster and further. The open system interconnection model helps understand the overall functions of each part of a data communication system, and how they interact with each other. It is found that the application layer is the upper layer software application that could include information that would be used to develop software programs.
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