Hello everybody, I'm having problem communicating with the MEGA 2560 through Serial 1,2 and 3 : the connection through USB via Serial 0 works perfectly but when I try to send data with Serial3 (pins 14 and 15) the computer recieve weird datas. It is as if the bytes are messed up. here is the cod…

RS 232 communication with Serial1 on MEGA 2560

arbarnhart January 27, 2011, 4:04pm 2

The Arduino serial ports are 5v TTL. RS-232 is -12v. You need a level shifter. Sparkfun has one I have used with great success.

scroll down below it to related products for one with a connector and/or a kit.

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