LM bus connection fault

[Domoticatorino]

Dear Sirs,
fort the first time I am getting cracy on a facility. I have a LM Lite with last firmware.

TP UART is connect (OK status). If I use LM IP tunneling connection is active but when I send a telegram by ETS nothing change on ETS bus monitor. I thoung was a device on bus problem but when I try to send telegram by USB telegram is good.

When I try send command by LM on group address list nothing change on ETS bus monitor.

It seems that IP command not not work.  Any idea please? I am in a theatre and I hope to sort the problem very soon.

Thanks.

BR

[Daniel]

Does the KNX device reacts to telegrams send by manual writing to objects in LM object tab?

[Domoticatorino]

Does the KNX device reacts to telegrams send by manual writing to objects in LM object tab?

NO

[Daniel]

Drop screenshot of KNX settings and KNX statistics

[Domoticatorino]

Drop screenshot of KNX settings and KNX statistics

Hi Daniel,
I unplug step by step some group of devices to verify if problem can be related to some devices in fault. 
In ETS bus monitor nothing strange (max load bus Is 20%) when Siemens Sincos (8 devices) send on bus telegrams   of temperature, status of valves and so on. Consider that facility has only 10 devices connected.

Bus voltage Is 29 volts and there Is no overload on Power supply. But in some case telegrams are not sent. Neither from LM neither from devices on bus. 

Is there a way from LM to monitor the bus voltage? 

Thanks.

BR