I use Xbee pro in transparent mode just to replace RS-232 wire. Not too much data-transmission is involved. I only use Pin 1:VCC, Pin 2 DOUT, PIN3 DIN, Pin 9 sleep control (set to low level) and Pin 10 GND.
The programme runs well in about one hour, and may freeze some time. And when the freezing happens, I can see a low frequency square waveform from Pin 9.
Could someone tell me what's wrong and how to solve the issue? Any help will be greatly appreciated.