The Atmel chips use 0-5V ttl logic level serial on pins 0 and 1
RS-232 on computer systems is a -12v to +12v swing and must be converted to be compatible
The Atmel chips use 0-5V ttl logic level serial on pins 0 and 1
RS-232 on computer systems is a -12v to +12v swing and must be converted to be compatible