For USB GPRS modems, a USB-to-serial converter typically converts the USB port into a virtual serial port so the rest of the system sees it as a serial device.

• 针对USB GPRS调制解调器而言,USB-to-serial转换器一般USB端口转换为虚拟串行端口,因此系统其他部分就会将它看作串行设备。