Code work well with PMDG in FSX but have issue in P3d.

Hello guys,

     I have 2 computers. I wrote a code which is using PMDG 737NGX(SP1d) and 777X(SP1d) SDK to control CDU. It works well with both products in FSX, but when I use the same code with PMDG products in P3d v3, I can only enter keyboard data to CDU, but I can NOT read out the light data (Eg. MSG, OFST, EXEC) from PMDG 737NGX and 777X.

My computer 1 : Windows7 SP1,  FSX v10.0.61637.0,  PMDG 737NGX(SP1d),  777X(SP1d).

My computer 2 : Windows7 SP1,  P3d v3,                      PMDG 737NGX(SP1d),  777X(SP1d).

  Is there anyone having the same problem? Thank a lot!