Since the circuit board has a connection which got “serial” label it, I soldered a 10 pins header soldered on it. I have tried to connect 10-pins to DB9 (PC) with different ombinations. No luck. I probably need to do more testing, may be it requires a null modem cable or something.. Does anyone know what’re the pin out ? Oh, I did test on a good WS100 P4. I am hoping WS100 will put messages to serial port during boot up. I setup 9600 8N1 none on PC side. Anyone has any suggestion ?