Lets try this a more reliable way.
There are two com port, 1 and 2, also called J9 and J8. Yes, in that order.
Pin 1 is data carrier detect
pin 2 is receive data
pin 3 is transmit data
pin 4 is data terminal ready
pin 5 is signal ground reference
pin 6 is data set ready
pin 7 is request to send
pin 8 is clear to send
pin 9 is ring indicate
NOTE: the onboard serial ports, Com 1 and Com 2, will be automatically disabled if external devices are found by the POST at the same I/O address. In addition, for those external devices which cannot be recognized by the POST, the onboard serial ports can be disabled via setup options.
George |