Pico W Readings From Read Holding Registers Not Stable

[mohdrais]

Hello Everybody, I am using IDE Ver 2.2.1, ModbusMaster Ver 2.0.1, Pico W and Max3485 (Modbus -TTL) with Windows 11 Pro Ver 22H2. Why I am getting unstable readings from Read Holding Registers? I used resistor 120 ohm as suggest by the Max3485 manufacture and the voltage used is 3.3V. Belows are the picture of the Max3485 (without RE and DE) and also the sketch: Somebody suggested that to copy and paste 'SERIAL_PORT_HARDWARExxxx,' to RPI PICO's 'pins_arduino.h', but it remains the same