Its been a long time since this thread was solved, but, i am succesfuly sending and receiving data from a singleboard rio through an XBEE PRO 900 HP. Do not try to use the RS232 port on the SBRIO, i have a sbRIO 9626, the logical levels ar non compatible.
Instead, try making a DO0 TX and DO1 RX. I found some example code of how to do it HERE: http://www.ni.com/example/27164/en/
Remember, this code is probably not adapted to the sbRIO you are using, so please spend some time doing setup and configuring the code for yor sbRIO.
From the PC Side, use VISA to receive from your XBEE, and from the RT side, use the VIs attached on the link i provided, there are some subVIs tha read and write and another one that starts the FPGA.
Sergio Velderrain
Software Community Lead
CLA I CTA I LabVIEW Champion Emeritus
"
Linkedin profile"