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DTech RS232 to RS485 Converter, 2 Pack Bidirectional RS-485 to RS-232 Serial Adapter with Terminal Block for Industrial Long Haul Data Communication : Electronics - Amazon.com
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4 Serial Port RS232/RS485/RS422 to Ethernet Converter
Amazon.com: DTECH RS232 to RS485 / RS422 Serial Communication Data Converter Adapter Mini-Size : Electronics
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