基于原有的SIM300GPRS模块和移动公司的MAS设备，研发USB接口的无线调制解调器。
This system uses a wireless modem with USB port based on SIM300 GPRS module and the MAS device of China Mobile.
介绍AT 89 C51单片机系统与智能调制解调器MODEM之间的接口电路和异步传输方式下的控制程序设计。
Interface circuit and the design of control program in asynchronous transfer mode between AT89C51 single chip microcomputer system and intelligent MODEM are introduced.
而且，该透明的PLC调制解调器由于其兼容性，可任意的支持RS- 485接口。
Also, this PLC transparent modem optionally supports RS-485 interface for compatibility reasons.
今天我们可以看到大量应用usb接口的终端设备出现。如键盘、鼠标、调制解调器、打印机、扫描仪、数码相机、摄像头以及移动存储设备等等。
Now we see a large number of computer peripherals using USB around us, such as keyboard, mouse, modem, printer, scanner, digital camera, video CAM and removable storage device etc.
今天我们可以看到大量应用usb接口的终端设备出现。如键盘、鼠标、调制解调器、打印机、扫描仪、数码相机、摄像头以及移动存储设备等等。
Now we see a large number of computer peripherals using USB around us, such as keyboard, mouse, modem, printer, scanner, digital camera, video CAM and removable storage device etc.
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