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A microcontroller board based on the ATmega2560 or 1280 chip. Use this tag for questions specifically regarding the Mega, and not just general Arduino usage.

2 votes

Why ModBus RTU Master-Slave Dont Work

I even didn't check the Modbus part of your code but the first think what I found: You are using the D2 pin for LCD and at the same time as TXEnablePin...
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