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I have some trouble trying to get info from a device using the following code:

from pymodbus.client.sync import ModbusSerialClient as ModbusClient
# mbClient = ModbusClient(method = "rtu", port="COM4", stopbits = 1, bytesize = 8, parity = 'N', baudrate = 9600)
mbClient = ModbusClient(method = "rtu", port="COM4")
mbClient.connect()
totalEnergy = mbClient.read_holding_registers(0x0000, 2, unit=1)
print(totalEnergy.registers)
mbClient.close()
It shows the error I put in the title.
The 0x0000 address should be the hour day etc according to the manual.
Here you can see the hour address that appears in the manual
Thanks and I wish to have luck finding a solution to my problem.
Use the code below instead of print(totalEnergy.registers) + enable Modbus logging, to dealing with Modbus error throwing:
import logging
logging.basicConfig()
log = logging.getLogger()
log.setLevel(logging.DEBUG)
# Your code body ...
if not totalEnergy.isError():
    '''isError() method implemented in pymodbus 1.4.0 and later'''
    print(totalEnergy.registers)
else:
    # Do stuff to error handling.
    print('Error message: {}'.format(totalEnergy))
And check mbClient.connect() return and its input arguments.
These are all of the things which you could manage it on client-side.
Thus, check your Modbus server/slave side also. 
        
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