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.
I would suggest three things. First, unless you are using Routers to extend the range, I would suggest installing the XBee 802.15.4 firmware on the modules (XBP24). Next, I would make sure that you are employing level shifters between your RS232 device and the 3V XBee. Third, I would suggest not using Pin sleep without using hardware flow control.