Pymodbus rtu cliente serie

import os
from pymodbus.client.sync import ModbusSerialClient as ModbusClient
#---------------------------------------------------------------------------# 
import logging
logging.basicConfig()
log = logging.getLogger()
log.setLevel(logging.DEBUG)

#---------------------------------------------------------------------------# 
cliente = ModbusClient(method='rtu', port='/dev/ttyUSB0', timeout=1, stopbits = 1, bytesize = 8,  parity='N', baudrate= 9600)
cliente.connect()

os.system('clear')

print "Read Coils"
request = cliente.read_coils(0x0,0x8,unit=1)
print request.bits[0]
print request.bits[1]
print request.bits[2]

print "Read Discrete Input"
request = cliente.read_discrete_inputs(0x0,0x8,unit=1)
print request

print "Read Holding Registers"
request = cliente.read_holding_registers(0x0,0x7,unit=1)
print request.registers


print "Read Input Registers"
request = cliente.read_input_registers(0x0,0x7,unit=1)
print request.registers

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