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USB High Speed Serial Adapter
By Keyspan by Tripp Lite

Looking for a way to connect your serial devices to a USB port on your PC? The Keyspan "High Speed" USB Serial Adapter is a simple, inexpensive, and reliable way to make this connection. - The Adapter is ideal for use with modems, digital cameras, ISDN terminal adapters, graphics tablets, PDAs, bar code scanners, label printers and other serial devices which require an RS-232 connection. ... 

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UC232S Serial to USB Converter
By Hawking Technology

The Hawking UC232S USB to RS232 Serial Adapter provides an external Plug and Play RS-232 serial connection with your computer, letting you free up your existing serial ports. Users have the capability to utilize the adapter with serial port interface in an easy-to-use environment. The adapter is designed for connections to cellular phones, PDAs, digital cameras, modems, or ISDN terminal adapters through your USB port with a data transfer rate of over 230kbps. ... 

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USB 4-Port Serial Adapter
By Keyspan by Tripp Lite

Certified: Microsoft WHQL approved - High speed: Supports 460 Kbps - four times the speed of a built-in serial port - Detachable Cable: Use adapter with any USB cable (up to 5 meters long) - LEDs: Show adapter status and data activity - Plug & Play: Appear as standard COM ports - Bus Powered: No external power adapter required ...