modbus rtu serial with rs485

hai friends,
i need to read the value available on the register using modbus serial without using software serial. i dont have any idea about this. can anyone share related documents or program regarding this....
thank u....
please help....

could you use an arduino Mega which has 3 extra serial ports?

no.. im using adafruit feather m0 SAMD board

if u have documents or program for Arduino mega please send me. i will modify for mt board

this may help

You will need to choose a modbus library or write your own.

Check the examples for how to use.

Are two possibilities. What signal levels are required on the hardware layer (TTL, RS-232, RS-485, or ?)?

thank you.... :slight_smile: