A connector used for a serial port on an computer along with the serial port symbol. In, a serial port is a interface through which information transfers in or out one at a time (in contrast to a ). Throughout most of the history of, data was transferred through serial ports to devices such as modems,, and various peripherals. While such interfaces as,, and all send data as a serial, the term 'serial port' usually identifies hardware more or less compliant to the standard, intended to interface with a or with a similar communication device. Free Online Kannada Books Download.

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Modern computers without serial ports may require serial-to-USB converters to allow compatibility with RS-232 serial devices. Serial ports are still used in applications such as industrial automation systems, scientific instruments, systems and some industrial and consumer products. Computers may use a serial port as a control console for diagnostics.

Network equipment (such as routers and switches) often use serial console for configuration. Serial ports are still used in these areas as they are simple, cheap and their console functions are highly standardized and widespread. A serial port requires very little supporting software from the host system. Contents • • • • • • • • • • • • • • • • • • • • Hardware [ ] Some computers, such as the, use an called a. This IC converts characters to and from form, implementing the timing and framing of data in hardware.

Very low-cost systems, such as some early, would instead use the to send the data through an pin, using the technique. Before (LSI) UART integrated circuits were common, a or would have a serial port made of multiple small-scale integrated circuits to implement shift registers, logic gates, counters, and all the other logic for a serial port. Download Office Xp Gratis on this page. Early home computers often had proprietary serial ports with pinouts and voltage levels incompatible with RS-232.

Inter-operation with RS-232 devices may be impossible as the serial port cannot withstand the voltage levels produced and may have other differences that ' the user to products of a particular manufacturer. Low-cost processors now allow higher-speed, but more complex, serial communication standards such as and to replace RS-232.

These make it possible to connect devices that would not have operated feasibly over slower serial connections, such as mass storage, sound, and video devices. Many personal computer motherboards still have at least one serial port, even if accessible only through a. Small-form-factor systems and laptops may omit RS-232 connector ports to conserve space, but the electronics are still there. RS-232 has been standard for so long that the circuits needed to control a serial port became very cheap and often exist on a single chip, sometimes also with circuitry for a parallel port. A converter from USB to an RS-232 compatible serial port; more than a physical transition, it requires a driver in the host system software and a built-in processor to emulate the functions of the compatible serial port hardware. DTE and DCE [ ] The individual signals on a serial port are unidirectional and when connecting two devices the outputs of one device must be connected to the inputs of the other. Devices are divided into two categories (DTE) and (DCE).