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DC 12V 8ch Modbus Rtu UART TTL232 IO Control Module for Arduino UNO MEGA Relay PLC Breadboard [TL19A08_12V] - USD $2.99 : canton-electronics.com
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8ch Input/Output UART RS485 Modbus RTU Controller PLC Expansion board for Arduino UNO MEGA NANO STM32 AVR PIC [N4DIG08_no] - USD $6.99 : canton-electronics.com
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Arduino master/slave communication using RS485 and Modbus protocol - Networking, Protocols, and Devices - Arduino Forum
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