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us b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。
This system uses a wireless modem with USB port based on SIM300 GPRS module and the MAS device of China Mobile.
基于原有的SIM300 GPRS模块和移动公司的MAS设备，研发USB接口的无线调制解调器。
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