A RS serial port was a standard feature of personal computers as it was the preferred way to connect modems, keyboards, mice, external storage and many other peripheral devices. RS is the common standard used in serial ports. It defines the electrical properties and the timing of signals, as well as the interpretation of signals, and the physical size and pinout configuration of a connector. Modern day computers seldom have RS ports.
These shortcomings include low transmission speed, limited cable length, substantial voltage fluctuations, and limited multidrop capabilities.
It is however possible to use an external USB-to-RS converter or an internal expansion card with one or more serial ports to connect a RS serial peripheral device to your computer. Many motherboards also feature a COM port header which makes it possible to install a bracket with a DE-9 port. Despite the shortcomings and the technology advancements, RS interfaces are still very much in use with large industrial machines, networking equipment and scientific instruments where point to point, low speed wired data connections is sufficient.
A PC serial port interface is single ended. This means that you can only connect two devices using a RS serial cable. The data that is transferred between these two devices is transferred at a rate less than 20 kbps.
RS allows for full-duplex communication — this means that both devices can interface with each other simultaneously. A common ground between the computer and the connected serial device is mandatory. This is represented by voltage levels defined by the RS protocol. With RS, hot-plugging or hot-swapping is not supported, though it is sometimes possible to plug in a serial device and it will work while the computer is running.
With current technology, only a 9-pin connector is in use with most personal computers. A RS transmission begins with a start bit. A start bit notifies the receiving computer of the incoming transmission. Active Oldest Votes. Dave Tweed Dave Tweed k 16 16 gold badges silver badges bronze badges.
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