The PEX2S553 PCI Express serial card lets you turn a PCI Express slot into 2 RS232 (DB9) serial ports. Based on a native single chip design (no bridge chip), this 2-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), and reducing the load applied to the CPU by as much as 48% over conventional serial cards.
The RS232 Serial Adapter Card (PEX2S553) is compatible with a broad range of operating systems including Windows 2000/XP/2003/Vista/Windows 7/Server 2008 R2 (32 and 64 bit), Linux Kernel 2.6.11 and up, and MAC OS 10.4 and above.
Plus, the serial card includes an optional half-height/low profile bracket that allows the card to be installed in any PCI Express slot, regardless of the size of the computer case.
Does Not Work in Windows 7 Pro 64-bit
Pros: We have used this serial card in many PCs using Windows XP Pro as well as Windows 7 Pro -- both 32-bit. Has both full profile and low profile brackets in same box.
Cons: This card does not work properly in Windows 7 Pro 64-bit mode. The card goes dormant after 15 minutes. We use a key reading device with its own memory resident software. When the card goes dormant, the key reading device stops working. If you terminate the software and use the DOS command mode, the serial port will respond to you. Re-loading the software afterwards does not let the device work though. The PC has to be restarted. Ended up pulling these serial cards and using a serial port adapter cable from the PC manufacturer.
Other Thoughts: Did speak to StarTech technical support but they wanted loopback tests done -- we didn't have anything to do that with. The PC manufacturer sent us a serial comm port adapter cable to connect to the motherboard and allow for a serial comm port interface on the case. This worked fine. Never had a problem afterwards with the serial port going dormant.
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Pros: I am giving this three eggs because this card was easy to install, supported by older and current OSs and their technical support was surprisingly easy to access and helpful - confirm using the latest driver, re-seat the card, try a different PCI-e slot/computer, get another card.
Cons: I am not giving it five eggs because it only worked for two days before starting to fail - it would drift in and out of being recognized by Windows XP and eventually was unresponsive after about a week.
Other Thoughts: Now it is up to Newegg's RMA process to get a replacement and see how it performs.
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