Interface IEEE-1284 HD

Interface IEEE-1284IEEE-1284 is a port-printer, parallel port or LPT - the international standard of parallel interface for connecting peripheral devices to the personal computer. It is mostly used to connect printer, scanner and other external devices, but may also serve for other purposes, such as securing connection between two computers, connecting remote signaling and remote control mechanisms. The standard is based on the "Citronix" interface and its expanded PCP and PP versions. The name LPT originates from the name of the standard device - LPT 1 printer: LinePrinterTherminal or LineprintT in the operational systems of MSDOS. Initially the port was created for simplex - unidirectional transmission of data, as had been supposed, that the Citronix port would be used to work with the printer. Further on various companies developed duplex resolutions of the bitmode interface, EPP, ECP. Then the international IEE1284 standard was adopted, describing both the basic Citronix interface and its extensions. The port on the side of the computer-managing device has a 25-contact two-row socket TP25 female IEE1284A. On the peripheral devices the 36-contact socket Citronix IEE1284B is typically used. Along this cable connecting peripheral devices to the computer along the parallel port is usually performed through the 25-contact socket DB25 male on the one hand and the 36-contact socket IEE1284B on the other hand to another AB-cable. To connect the scanner and some other devices a cable with a DB25 male socket instead of the IEE1284B socket is used. The scanner is typically equipped with a second interface with the DB25 female IEE1284A socket to connect to the printer, as the computer typically has only one IEE1284 interface. The circuit technology of the scanner is made in such a way, that the scanner would transparently transmit data when working with the printer from one interface to another. To connect programmers with the RPT-interface use the cable DB25 male, DB25 female.