StarTech.com 2 Port CardBus Serial PC Adapter Card - CB2S950
2 x 9-pin x DB-9 Male RS-232 Serial

Needed a traditional RS-232 serial port on my laptop. Product was easy to setup and to get going. I have used a USB to Serial converter buthe the software was unstable and would not work on a consistant basis. I have used this one for a month with no problems and is working as promoted. I would strongly recommend buying this Startech CardBus serial adapter from Buy.com.
 
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Most laptops (possibly all of them by now) no longer include traditional RS-232 serial ports, but I regularly use serial communications in my engineering work. I often find it necessary to monitor comms on two devices simultaneously. As a person who has never had very good experiences with most USB-to-serial converter devices (they've never been very reliable for me), I was skeptical when a colleague recommended a PC-card style replacement. Now, I'm glad he did. With this card, I now have two very stable and very reliable "real" RS-232 serial ports on my laptop. Install was very simple and the unit operates as well as any serial device I've ever owned. Also, Buy.com's price on it was about $30 less than I had seen at other electronics sites. If you need to add a serial port (or two) to a laptop, I would strongly recommend buying this Startech CardBus serial adapter from Buy.com.
 
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