class ModbusWrapperServer():
def __init__(self,port=1234):
"""
Creates a Modbus TCP Server object
.. note:: The default port for modbus is 502. This modbus server uses port 1234 by default, otherwise superuser rights are required.
.. note:: Use "startServer" to start the listener.
:param port: Port for the modbus TCP server
:type port: int
"""
# chr = CustomHoldingRegister(ADDRESS_WRITE_START, [16]*100)
# cdi = CustomHoldingRegister(ADDRESS_WRITE_START, [16]*100)
self.onShutdown=False;
self.state_changed = Signal()
cco = CustomHoldingRegister(ADDRESS_WRITE_START, [16]*100)
self.store = ModbusSlaveContext(
di = ModbusSequentialDataBlock(ADDRESS_WRITE_START, [16]*100),
co = cco,
hr = ModbusSequentialDataBlock(ADDRESS_WRITE_START, [16]*100),
ir = ModbusSequentialDataBlock(ADDRESS_WRITE_START, [16]*100))
self.context = ModbusServerContext(slaves=self.store, single=True)
self.identity = ModbusDeviceIdentification()
self.identity.VendorName = 'Pymodbus'
self.identity.ProductCode = 'PM'
self.identity.VendorUrl = 'http://github.com/bashwork/pymodbus/'
self.identity.ProductName = 'Pymodbus Server'
self.identity.ModelName = 'Pymodbus Server'
self.identity.MajorMinorRevision = '1.0'
self.store.setValues(2,0,[0]*1)
self.post = Post(self)
framer = ModbusSocketFramer
self.server = ModbusTcpServer(self.context, framer, self.identity, address=("0.0.0.0", port))
def startServer(self):
"""
Non blocking call to start the server
"""
self.post._startServer()
def _startServer(self):
print "Modbus server started"
self.server.serve_forever()
def stopServer(self):
"""
Closes the server
"""
self.onShutdown = True
self.server.server_close()
self.server.shutdown()
def waitForCoilOutput(self,address,timeout=2):
now = time.time()
while not self.onShutdown:
values = self.store.getValues(1,address, 1)
if values[0] is True:
return True
else:
if timeout > 0 and now + timeout > time.time():
time.sleep(1/50)
else:
return False
def stateChangeListener(self,address):
self.post.__stateChangeListener(address)
def __stateChangeListener(self,address):
old_state = 0;
while not self.onShutdown:
value = self.store.getValues(1,address, 1)[0]
if old_state != value:
old_state = value
self.state_changed(address,value)
#print "state has changed"
time.sleep(1/50)
def setDigitalInput(self,address,values):
if not values is list:
values = [values]
self.store.setValues(2,address,values)
def triggerInput(self,address,timeout=0.5):
self.setDigitalInput(address, True)
self.post.resetInput(address, timeout)
def resetInput(self,address,timeout):
time.sleep(timeout)
self.setDigitalInput(address, False)
