@azat385 ,

You can create a Serial object which talks to moxa via raw socket or even RFC 2217 (I think moxa supports both in all models).
I recommend you use raw socket unless you need to change the serial line settings frequently (like using different baudrate)

Here is an example:

import serial
from umodbus.client.serial import rtu

serial_port = serial.serial_for_url("socket://moxa.acme.org:6610")
message = rtu.write_multiple_coils(slave_id=1, address=1, values=[1, 0, 1, 1])
response = rtu.send_message(message, serial_port)

serial_port.close()

Hope it helps.

@tiagocoutinho thanks a lot !