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StarTech.com 1-Port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9 Controller - Low Profile - PEX1S953LP - Serial Adapters - CDW.com
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Serial Port Splitter - Share dataflow of one serial port among several applications or join dataflow of several serial port devices to one application.
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Serial Port Control - Easy to use control intended for simplification serial port communication tasks in your projects.
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Amazon.com: StarTech.com 2-Port PCI Express Serial Card with 16C1050 UART - RS232 Low Profile Serial Card - PCI Serial Card (PEX2S1050) : Electronics
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