gistfile1.txt

import minimalmodbus
import sys


SERIAL_PORT = '/'
DEVICE_ADDRESS = 1
DECIMAL_COUNT = 1

def modbus_RTU():
	try:
		device = minimalmodbus.Instrument(SERIAL_PORT, DEVICE_ADDRESS)
		r1_value = device.read_register(1, DECIMAL_COUNT)
		r3_value = device.read_register(3, DECIMAL_COUNT)
		print r1_value
		print r3_value
	except IOError:
		print "communication error with device"
		sys.exit(1)


if __name__ == "__main__":
	modbus_RTU()