Winners® 3-in-1 USB to RS485 RS232 TTL Serial Port Module CP2102 Chip Board
CP2102 RS232/485 USB
CP2102 USB to TTL RS232 USB TTL to RS485 Mutual Convert 6 in 1 Convert USB to Serial 33V Multifunctional Convert Interface: Amazon.com: Industrial & Scientific
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MD0230 - CP2102 RS232 USB To TTL Converter Module Adapter