Getting Started with Modbus RTU on ESP32

Short summary

A practical tutorial for implementing Modbus RTU master mode on ESP32 over RS-485, covering hardware wiring with TTL-to-RS-485 transceivers, library selection, and working Arduino code for polling holding registers. Includes guidance on register types, termination resistors, slave addressing, and library comparisons. Targets developers connecting ESP32 to industrial devices like energy meters and PLCs.

• •Wiring ESP32 to RS-485 bus via MAX485 transceiver with direction control
• •ModbusMaster library used for polling holding registers from slave address 1
• •Covers register types, termination resistors, and alternative library options

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