Trying to set up a software serial using MAX202 processor on this adapter: http://www.robotshop.com/productinfo.aspx?pc=RB-Dfr-165&lang=en-US
I'm following the directions in this tutorial: http://arduino.cc/en/Tutorial/ArduinoSoftwareRS232
So far no luck! I have tried a few different digital IO pins including pins 0 (RX) and 1 (TX). They all send nonsense to the port using the software serial program from the tutorial.
HOWEVER, using the Serial.write and Serial.read() functions works fine when I connect the adapter pins RXD --> digital IO pin 0; TXD --> digital IO pin 1.
So is there a bug in the tutorial code? Why doesn't it work on the digital IO pins?