dwCANInterpreter_buildFromDBC doesn't support signed signal?

I’m using dwCANInterpreter_buildFromDBC to creates a CAN data based on DBC file format. One signal is a signed one and it’s defined as signed single in DBC file.
But when the physical values is negative (-100degree for example), the CAN data sent by PX2 is incorrect. The dwCANInterpreter_buildFromDBC doesn’t support signed signal in DBC file?

Dear @lip319,
Could you share sample code and data to reproduce the issue and check?