>I think I understand now.
>So, in my case, I need a CToBin(Substr(lqPFM,25,2),"2rs") to get the alignment.
>Just one more thing... why to set the alignment is necessary to stuff 4 positions in the string if the structure element require just 2?

Eeeee, no. Four bytes - four bytes, two bytes - tow bytes.

Byte aligment is unnecessary for CTOBIN() function in your case.

MartinaJ