Expresscard Serial Port This item was available at a cheaper price shipped from within the USA than the exact same item shipped directly from China. Delivery was within the time frame promised.
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I had overlooked the notation that drivers were not available for 64 bit versions of Windows. When I contacted customer support to check on possible updates, they were clueless - polite and trying to be helpful, but wanting me to download things like Adobe Acrobat as a driver. Upon installation, 64 bit Windows 7 Pro recognized the device and installed drivers for it (which did not work).
However, Windows searched for updated drivers and found 64 bit drivers dated August, 2016 which when installed let the device work properly on the 64 bit system. It has not been used at baud rates over 9600, but works smoothly with no handshaking at that speed.
The EC1S952 1 Port Native ExpressCard RS232 Serial Adapter Card with 16950 UART lets you add an RS232 serial port to your laptop or ExpressCard-equipped desktop computer. The serial ExpressCard is designed based on a single-chip architecture (as opposed to cards that use a 'bridge chip'), providing native PCI Express communication for greater performance and reliability by reducing the CPU load by up to 48%, and lowering power consumption. An included stabilizer bracket allows the EC1S952 to fit snugly in both 34mm and 54mm ExpressCard slots. Providing optimal communication with RS232 serial devices, this ExpressCard serial card supports baud rates of up to 115.2Kbps and features a 128-byte FIFO buffer, plus a high performance 16C950 UART. Backed by a StarTech.com lifetime warranty and free lifetime technical support.