FPGA Serial Communication

Hi,

I need to interface a GPS module to my sbRIO. The GPS module sends data serially (UART-RS232). The RS-232 port available on sbRIO which is connected to RT side is already used by a wireless module I am using.

I have searched different threads and LV example implementing RS-232. Just for the sake of testing, I connected one DIO of my sbRIO to the Tx pin of arduino and tried receiving some data but nothing happens. The baud rate, parity bits and other parameters are all identical for both arduino and sbRIO.
Am I making some kind of blunder here. Help needed.

Thank you.