2020-11-26, 09:08 PM
(2020-11-26, 08:02 PM)Peter— Wrote: So the difference between pulling wires from the rs232 Tx and rx pins vs using the gpio rxd and txd pins is 3.3v vs 5v... lame
Not that lame, in fact:
- RS232 '1' is negative voltage, TTL '1' is positive.
- RS232 '0' is positive voltage, TTL '0' is zero volt.