Common scanner interface type has the following three types:
SCSI (small computer standard interface): this interface Max number of connected devices for 8, maximum transmission speed is usually 40M/S, faster, generally connect high-speed devices. SCSI device installation is more complex, plus a SCSI card in a PC machine, prone to hardware conflicts, but powerful.
EPP (enhanced parallel port): an enhanced bi-directional parallel interface, the maximum transmission speed of 1. 5Mbps。 Advantage is not required on the PC by using other card, an unlimited number of connections (as long as you have enough ports), equipment installation and easy to use. Disadvantage is that speed is slower than SCSI. This interface is installed and easy to use while in the low-end performance requirements of replacing the SCSI interface.
USB (universal serial bus): can connect up to 127 peripherals, today's highest standard USB1.1 transfer speed is 12Mbps (1.5MB/s), and there is a secondary channel for low speed data transmission (1.5Mbps (192KB/s)). USB2.0 standard scanning speed of 480Mbps (60MB/s). USB 3.0 speeds up to 5Gbps (640MB/s). With hot-swap function, Plug-and-play. This interface scanner with USB standard under Intel's push for establishing and promoting and increasing popularity.