Serial Data Transmission Includes:
Serial data standards Common standards:RS232RS422RS449RS48520 mA current loop
Serial data transmission standards including RS232, RS422, RS423, and RS485 were widely used for many data links, proving effective connectivity for the day. Although not nearly as widely used today, they can still be found in some areas.
All types of communications networks use serial transmission, and the internal channels in computers have switched from parallel to serial data transfer. For more details, see parallel vs. Parallel data transmission is faster compared to serial data transmission. The speed of a parallel link is equal to the number of bits sent multiplied by the bit rate of each individual path. In parallel transmission n bits are transfered simultaneously, hence we have to process each bit separately and line up them in an order at the receiver. Hence we have to convert parallel to serial form. This is known as overhead in parallel transmission. Signal skewing is the another problem with parallel data transmission.
Serial data transmission links used cables with a variety of different functions to enable data to be sent reliably between two equipments. Although a number of different wires were often used within a cable, they did not require nearly as many as the systems that sent parallel data.
Serial data standards background
The first of the RS standards was RS232, or more correctly RS-232. This was developed in 1962 when the need for forms of transmitting data from modems attached telephone lines to remote communications equipments became apparent.
The 'RS' stands for Recommended Standard, although later these standards were formally adopted by the EIA / TIA in the USA.
The EIA is the Electrical Industries Association and the TIA is the Telecommunications Industries Association. Once RS-232 was established an equivalent standard was written for the ITU (International Telecommunications Union) to provide a more international standard. This would enable the same standards to be used worldwide and also give manufacturers access to a global market using just one product. This standard was known as V.24 and is totally compatible with RS-232.
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With RS232 well established and the need for faster communications and over longer distances, further standards beyond RS232 were introduced. Although a number of standards were introduced, the most widely used are RS-422 and RS485.
Serial data standards summary
Comparison of serial data standards
Examples Of Parallel Data Transmission
Each of these standards meets a different requirement. RS232 still being very widely used despite the fact that it has been in use for over 40 years. However the other standards that have been introduced more recently provide higher levels of performance that are very useful in may applications.
Serial Data Transmission Vs Parallel Data Transmission
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