def read_holding_registers(slave_id, starting_address, quantity):
""" Return ADU for Modbus function code 03: Read Holding Registers.
:param slave_id: Number of slave.
:return: Byte array with ADU.
"""
function = ReadHoldingRegisters()
function.starting_address = starting_address
function.quantity = quantity
return _create_request_adu(slave_id, function.request_pdu)
def read_holding_registers(slave_id, starting_address, quantity):
""" Return ADU for Modbus function code 03: Read Holding Registers.
:param slave_id: Number of slave.
:return: Byte array with ADU.
"""
function = ReadHoldingRegisters()
function.starting_address = starting_address
function.quantity = quantity
return _create_request_adu(slave_id, function.request_pdu)
def test_read_holding_registers_response_pdu(read_holding_registers):
response_pdu =\
read_holding_registers.create_response_pdu([1337, 17, 21, 18])
instance = ReadHoldingRegisters.create_from_response_pdu(response_pdu, read_holding_registers.request_pdu) # NOQA
assert instance.data == [1337, 17, 21, 18]
def read_holding_registers():
function_code = 3
starting_address = 100
quantity = 3
pdu = struct.pack('>BHH', function_code, starting_address, quantity)
return ReadHoldingRegisters.create_from_request_pdu(pdu)
def read_holding_registers():
instance = ReadHoldingRegisters()
instance.starting_address = 100
instance.quantity = 4
return instance
def test_read_holding_registers_request_pdu(read_holding_registers):
instance = ReadHoldingRegisters.create_from_request_pdu(
read_holding_registers.request_pdu) # NOQA
assert instance.starting_address == 100
assert instance.quantity == 4
def read_holding_registers():
instance = ReadHoldingRegisters()
instance.starting_address = 100
instance.quantity = 4
return instance
def test_read_holding_registers_request_pdu(read_holding_registers):
instance = ReadHoldingRegisters.create_from_request_pdu(read_holding_registers.request_pdu) # NOQA
assert instance.starting_address == 100
assert instance.quantity == 4
