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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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SST-8P PCI 8 Port RS232 Serial Adapter 920K
By Avocent

This intelligent serial I/O adapter use less than 1% system load so servers won't slow down as you run more applications, attach more devices or service more users. The Avocent SST-8P 8 Port Serial Adapter deliver the performance and speed you need at a very affordable price. Installation and set up take just a few minutes. ... 

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SST-4P/LP Universal - 4 Port Low Profile Universal PCI Adapter
By Avocent

Designed for ultimate flexibility, Avocent SST-4P Multiport Serial Adapter is available with support for 4 ports. These intelligent leading-edge adapter support a 3.3V or a 5V PCI bus and offload virtually all serial traffic from your system CPU so servers won't slow down as I/O demand increases. ...