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UART TTL to RS485 Two-way Converter Module [TTL-RS485-Module] - US $2.
SCHEMATIC CIRCUIT MODULE TTL TO RS485 - EasyEDA
RS485 to TTL MAX485 Arduino Module - Pixel Electric Engineering Company
RS485 To TTL UART Signal Level Converter DC 3.3V 5V Module
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TTL TO RS485 converter Resources - EasyEDA