Im linking up two Arduino Megas over a ethernet bridge, this happens to have a serial RS232 bridge on it as well. Ive saturated the ethernet part, so my Arduino to Arduino communication will be over the serial link.
Documentation for the link, and testing with multimeter the RS232 signal is at 5.6V. I noted online it says be careful as a lot of RS232 is 12v and will damage the Arduino. Also that the Arduino in those situations needs a level shifter to bring it down to 5v.
Question is, is 5.6v ok, or do I still need a level shifter?