LPT is commonly known as parallel port. Generally, a computer has only one parallel port, which is displayed as LPT 1 in the device manager. The ports that printers often see in zhi are LPT port and USB port. Many new motherboards cancel the onboard LPT interface, and a few special printers use 1394 interface and COM port (serial port).

Network printers are directly connected to switches or routers through network cables. The computer should also be connected to the same switch or router as the printer. This is a network segment device. Generally speaking, you should add a port before you can select it.

Computers have usually created LPT 1, COM 1, COM2, COM3 and COM4 by default, and only these inherent ports can be selected. But if you want to use other ports not listed in this list, you must create a corresponding new port.

Extended data:

LPT port is a (printer-specific) port;

LPT parallel port is an enhanced two-way parallel transmission interface, which was the most commonly used interface for scanners and printers before USB interface appeared. The highest transmission speed is 1.5Mbps, and the equipment is easy to install and use, but the speed is relatively slow.

cluster communication port

That's also the printer interface. The printer has two interfaces, one is COM interface and the other is USB interface. Ink-jet printers generally use USB interface, needle printers and laser printers use COM interface, but laser printers also have USB interface.

COM port is a multi-functional port, and it can also be connected with other devices (old-fashioned) such as game consoles and mice.

Baidu encyclopedia -LPT interface