When you are presented with pins that you suspect provide Serial but you do not have access to the documentation. Connect your Arduino to all of the pins (limited by the number of Ditial pins you have on your board) and this sketch will try every possible pin combination and baud rate to determine RX/TX. It will also try to send wakeup characters to stimulate the line, such as a carriage return or other txpatterns that you add. This code sends data using a custom SoftwareSerial library.
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honestly, im not sure about the software serial setup. but this works and was tested with all baudrates on the teensy++ for both 8 and 16mhz at 5 and 3v3.
def28f7View on GitHubFixed major issues with softserial. It wasnt' properly sending TX wakeup signals for buadrates above 28800
2b0b74dView on GitHubturned off emulate mode (debug). had left it on by accident
3f46c1dView on GitHub