I have a project that requires me to read data from a DE-9 pin serial connector. The port is mounted on a handheld air quality monitor that spits out data every 6 seconds.
How can I wire my Arduino Duemilanove to read data from this com port? Can I wire the pins on the com port directly to the digital input pins on the Arduino, or do I need electronics like resistors to divide the voltage? Which pins do I need from the com port? I know that pin 5 is the reference ground, and pins 2 and 3 are the received and transmitted data pins respectively. To me, it sounds like I'll only need pins 5 and 3, but maybe you guys have more information.
If anyone has worked on a similar project your help would be greatly appreciated.