Modbus communication in Raspberry Pi

                                            

Step 1: Install python Package minimalmodbus

sudo pip install minimalmodbus

Step2: Open any editor and copy below code:

import minimalmodbus

import time

minimalmodbus.BAUDRATE = 9600

# port name, slave address (in decimal)

instrument = minimalmodbus.Instrument('/dev/ttyAMA0',1)

while True:

    # Register number, number of decimals, function code

    temperature = instrument.read_register(3853, 1, 3)

    print temperature

    time.sleep(1)