I'am arduino newbie...
I have create a new project for read four serial ports. I using Serial Port Arduino Mega(Serial 1,2) and MAX232 transceivers (for the conversion RS232 to TTL 5V) like this:http://arduino.cc/en/Tutorial/ArduinoSoftwareRS232
My PC Serial exit with 3 wires (RX,TX and GND)
have a problem: If I use Arduino serial embedded, the data reading it works only with GND not connect
... and if I use the serial connected to MAX232 it works only with GND CONNECTED!!!
Somebody help me???
Thanks a lot and sorry for my english!