PyTango.DevFailed occurred Message=DevFailed[ DevError[ desc = ModbusTCP: No error origin = ModbusTCP::SendGet reason = ModbusTCP::error_read severity = ERR] DevError[ desc = Failed to execute command_inout on device test/modbus/1, command ReadHoldingRegisters origin = Connection::command_inout() reason = API_CommandFailed severity = ERR] ] StackTrace: C:\Python27\lib\site-packages\pytango-8.1.6-py2.7-win-amd64.egg\PyTango\connection.py:127 in __Connection__command_inout_raw C:\Python27\lib\site-packages\pytango-8.1.6-py2.7-win-amd64.egg\PyTango\connection.py:101 in __Connection__command_inout C:\Python27\lib\site-packages\pytango-8.1.6-py2.7-win-amd64.egg\PyTango\green.py:73 in SynchExecutor.submit C:\Python27\lib\site-packages\pytango-8.1.6-py2.7-win-amd64.egg\PyTango\green.py:81 in synch_submit C:\Python27\lib\site-packages\pytango-8.1.6-py2.7-win-amd64.egg\PyTango\green.py:165 in greener in green C:\Python27\lib\site-packages\pytango-8.1.6-py2.7-win-amd64.egg\PyTango\device_proxy.py:198 in f in __DeviceProxy__getattr C:\Modbus\PythonApplication1.py:26 in main