Black Box Async RS-232<->RS-485 Interface Converter - serial adapter - RS-232 - IC1620A-F - Transceiver Modules - CDW.com
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Amazon.com: 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
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Amazon.com: USB to RS232 / RS485 / TTL (UART) Industrial Isolated Converter with Original FT232RL Inside Aluminium Alloy Enclosure Power/ADI Magnetical Isolation,TVS Diode : Electronics
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