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USB-485 USB to RS485 Converter Adapter Support Win7 XP Linux Vista Mac OS WinCE5 | eBay
Industrial USB to RS485 Converter, Original FT232RL and SP485EEN
Amazon.com: Waveshare Industrial USB to RS485 Converter with Original FT232RL and SP485EEN Embedded Protection Circuits for Industrial Control Equipments and/or Applications with High Communication Requirement : Electronics