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Amazon.com: ALMOCN 2 Pack TTL to RS485 Adapter Module 3.3V 5V 485 to TTL Signal Single Chip Serial Port Level Converter Borad with RXD, TXD Indicator : Electronics
DC 7-24V Modbus-RTU 4 Channel Relay Module RS485 TTL Controller Switch Signal Input Output Anti-Reverse Connection for Arduino: Amazon.com: Industrial & Scientific
