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Printer Plug-In: How Parallel Ports Work
How Printer-Plug-Ins Work
Printer-Plug-in: How Parallel Ports Work
The purpose of this paper is to thoroughly explain how printer plug-ins, specifically those connected to a parallel port works.
There are several types of methods of transmission of data from a computer to a printer. The types of connections that may be utilized are the serial port, the USB port, and the parallel port as well as others not mentioned. The parallel port is one specific way that a printer connects to a computer and is the way that the computer communicates the print job to the printer. Originally developed by IBM for use with Centronics printers the method sought was on in which the same port interface on the printer was not used on the computer.
As an alternative the engineers that worked for IBM decided instead take a DB-25, or a 25-pin connector coupled with a Centronics 36-pin connector in the creation of a cable especially made to connect the computer and printer to each other. Afterward the Centronics interface was utilized by other manufacturers of printers and the result was the status of being "standard"...
Data is sent to a printer from a computer or other connecting device through the use of a parallel port which sends eight (8) bits of data and does so one in increments of one byte at a time. The transmission of the 8 bits of data is accomplished in a manner that is at a parallel one to the other instead of the alternative method of the eight bits going across a serial transmission. Serially transmitted data is where the data is sent across the connection in a single row and is done so through a port called a serial port. Generally between 50 and 100 kilobytes of data is transmitted per second over a serial transmission.
As stated there are 25 pins on the connector and they are utilized as follows:
Pin One: The strobe signal is transmitted via this pin at a level between 2.8 and 5 volts however when the computer transmits a byte of data and the voltage dip is the signal that lets the printer know data is on the way.
Pin Two: through Pin Nine are the pins responsible for transmitting the data itself. In informing the printer that a bit value of 1 is present five volts of charge is transmitted through the pin. If there…
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