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Digi Neo 8 port PCIE RS232 serial board (low profile) (requires connection option) – BCI Imaging Supplies
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Pcie Multi Serial Card 2-port Rs232 Com + Print Parallel Lpt Port Expansion Card Wch382l Chipset W/ Low Profile Bracket - Add On Cards & Controller Panels - AliExpress
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StarTech.com 4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485 Model PEX4S232485 - Newegg.com
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Digi ConnectPort LTS MEI 8 port RS232/422/485 serial to ethernet terminal server w/(8) RJ45 RS232/422/485 ports, (2) RJ45 gigabit ports & Multi-Electrical Interface capability – BCI Imaging Supplies
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