Module Introduction LPT(Line Print Terminal) is applied in the printer and other devices (such as scanner). Most of computers have one or two LPTs which are called LPT1 and LPT2 respectively; but some computers support a third LPT, which is called LPT3. No matter how many LPT they have and what the names are, the LPT1 is the defaulted LPT. When users add the new device, they can add an adapter with the parellel interface. It notes that the LPT is not only used to output data, but also it can be used to input data. The LPT is the enhanced duplexing parellel transmission interface, which is commonly used in the scanner and the printer before the USB interface appears. This device is easy to install and use, but the speed is slower. LPT Interface(Parallel Port): It is used to connect the printer or the scanner. The defaulted Interrupt Signal is IRQ7, and it adopts the DB-25 connector with 25 Pins. The modes of the LPT are as below: 1. SPP Mode: The data of the SPP adopts the Semiduplex Unidirectional Transmission; the transmission speed is slower, which is 15Kbps. But the application of the SPP is wide, which is set as the defaulted Working Mode usually. 2. EPP Mode: The EPP adopts the Bi-direction Semiduplex Data Transmission; the transmission speed is higher than the SPP, which is 2Mbps. There are many Peripheral Devices using this mode at present. 3. ECP Mode: The ECP adopts the Bi-direction Full-duplex Data Transmission; the transmission speed is higher than the EPP. There is not too many devices to support this mode. 4. BI-DIRECTION: It is a kind of the Parellel Transmission Mode of the Bi-direction Transmission. It is compatible with the SPP. The difference is that the transmission is the Unidirectional Transmission in the SPP Mode( It only can be used to output data, so it can’t be supported by the scanner). Application Field It is applied in the computer peripheral devices, such as the printer, the scanner and so on. 【DOWNLOAD】