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PCIe to 2 Ports DB9 RS232 Serial  DB25 LPT Converter card AX99100 Chipset
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  • $26.60 
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USB 2.0 to RS422 RS485 Converter Adapter Serial PL2303 Chip Wholesale 2108G
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  • $29.93 
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UT-8812 2-ports USB to RS-232 Serial Converter with ESD protection
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  • $47.03 
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