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Edgeport/1 - USB to 1-Port EIA-232 Serial DB9 with 2m Captive Cable
By Digi International

The Edgeport/1 USB-to-serial converter is the newest member of the Edgeport family of enterprise Universal Serial Port (USB) connectivity solutions. One-sixth the size of our Edgeport/2, this single port solution is merely a bump in the cable, yet it has the same reliability, performance and operating system support that Edgeport users have come to expect. ... 

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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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Edgeport/4 - USB to 4-Port EIA232 DB9
By Digi International

Edgeport USB-to-serial converters offer an easy Plug and Play solution for COM port expansion. An external box alternative to PCI cards, Edgeport connects serial devices to a PC or server's USB port, eliminating the need to open the chassis, reconfigure and reboot. Simply plug in the Edgeport and in minutes gain up to 16 serial ports to connect bar-code scanners, printers, or any serial peripheral device. ...