thanks for reply.
I 've solved this strange problem ( I think!!1...)...I've changed the mode of xbee to API to API 2.
Now I can get these numers ( specific whwn a array with 124...until 127 ans the number 17 and 19).
Seems the my VI was ok..the problem was the xbee configuration.
But ( always has a but....hahaha)..now when a Xbee send a array of bytes with the number 10 in one of the uint8, the packet comes break...
I have 13 bytes in my packet, if one of then is the number 10, is like a terminal signal...after the number 10 no more bytes...only zeros...and , obvious, stop my vi...
Go to google see about xbee problems.....
The number 10 (0x0A) is the new line charater (aka \n or line feed/LF) in ASCII. This is the default termination character for VISA for serial connections. If you do not want to use a terminator you should disable it (there is a boolean input to the Configure Serial Port VI for disabling it or changing it to something else).
If you do choose to use a termination character, you need to make sure that your data will never include that character.