Hi, I would like to connect an Arduino to a serial PC modem. My idea is sending AT command by the use of Arduino's serial interface. I have read something about RS-232 and I think there should be a problem if I try to make the connection directly (PC serial port works at higher voltage than Arduino's one, so serial modem should work at higher voltaje too) However, I found this link (http://www.arduino.cc/es/Tutoriales/SMS) where there is a direct connection between Arduino and a serial gps modem. Can I try a direct serial connection or do I try using a max232 or something like that.
Thanks in advance.