Parallel Port/LPT Port, although many people are not using it anymore, is still used by some people/community who wants to learn data transmission parallel. The colleges (student and university student) still learn parallel data communication as a media to add knowledge and understanding how to deliver data parallel.
Parallel Port
Parallel Port or Printer Port actually consists of 3 parts which each of them has its own name based on its task in printing process in printer. Those 3 parts are Data Port (DP), Printer Control (PC), and Printer Status (PS). DP is used to send data which will be printed by Printer; PC is used to sent the control codes from computer to printer, for example control code to roll the paper, and PS is used to sent the status codes printer to computer, for example to confirm that the paper is run out.
DP, PC, and PS actually are 8 bit ports, but DP is the only one that has 8 bit. For PC and PS, just a few bits that are being used which means just some bits from the port that we can use for interfacing. Port PC is read/write port (read/write), PS is just read port (read only), while DP port is read/write port (read/write). However, this ability is only possessed by Enhanced Parallel Port (EPP), while Standard Parallel Port (SPP) only has ability to write. In EPP, the management of line direction is conducted through 5 bit PC. If 5 bit PC is 0, so the 2-direction line DP become out of the parallel port, and vise verse if the 5 bit PC is 1, so the 2 way direction line of DP become enter from parallel port.
Picture . Parallel Port In Personal Computer (LPT Port) The Basic Concept : Parallel port register
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