ValueError: The slave is indicating an error. The response is: '\x01\x83\x02\xc0\xf1'

[arsohel]

when i run the program its showing value error

import minimalmodbus
instrument = minimalmodbus.Instrument('COM3', 1) # port name, slave address (in decimal)
instrument.serial.baudrate = 9600
instrument.serial.bytesize = 8
instrument.serial.parity = minimalmodbus.serial.PARITY_EVEN
instrument.serial.stopbits = 1
instrument.serial.timeout = 1
instrument.debug = True
instrument.mode = minimalmodbus.MODE_RTU
print instrument
#l1_voltage = instrument.read_float(3911, functioncode=3, numberOfRegisters=2)
temperature = instrument.read_register(3911 , 2)
print temperature

Traceback (most recent call last):
File "C:/Python27/usbtors485.py", line 12, in
temperature = instrument.read_register(0x3911 , 2)
File "C:\Python27\lib\minimalmodbus.py", line 258, in read_register
return self._genericCommand(functioncode, registeraddress, numberOfDecimals=numberOfDecimals, signed=signed)
File "C:\Python27\lib\minimalmodbus.py", line 697, in _genericCommand
payloadFromSlave = self._performCommand(functioncode, payloadToSlave)
File "C:\Python27\lib\minimalmodbus.py", line 798, in _performCommand
payloadFromSlave = _extractPayload(response, self.address, self.mode, functioncode)
File "C:\Python27\lib\minimalmodbus.py", line 1088, in _extractPayload
raise ValueError('The slave is indicating an error. The response is: {!r}'.format(response))
ValueError: The slave is indicating an error. The response is: '\x01\x83\x02\xc0\xf1'

[andig]

This is a go library, you're using python?