def test_create_function_from_response_pdu():
read_coils = ReadCoils()
read_coils.starting_address = 1
read_coils.quantity = 9
req_pdu = read_coils.request_pdu
resp_pdu = struct.pack('>BBB', 1, 1, 3)
assert isinstance(create_function_from_response_pdu(resp_pdu, req_pdu),
ReadCoils)
def read_coils(slave_id, starting_address, quantity):
""" Return ADU for Modbus function code 01: Read Coils.
:param slave_id: Number of slave.
:return: Byte array with ADU.
"""
function = ReadCoils()
function.starting_address = starting_address
function.quantity = quantity
return _create_request_adu(slave_id, function.request_pdu)
def read_coils():
instance = ReadCoils()
instance.starting_address = 100
instance.quantity = 3
return instance
