Experience on how to improve the anti-interference of TTL (UART) communication

TTL

TTL Serial port communication , Unlike RS232、RS485, These have certain anti-interference ability ,TTL More vulnerable ; But some disturbing occasions appear again TTL, This requires anti-interference .
Experience ：
（1） It's best to limit TTL Communication length , It's better to control 1m within ;
（2） No twisted pair , Or knot , Try to ensure that it leads to TX Line and RX The lines are parallel and straight , And ensure that the two wires are consistent ;
（3) Magnetic ring , hold RX Line and TX The line goes through the magnetic ring , As long as it is within the required range , The more magnetic rings, the better （ Strong interference environment , There have been more than ten small magnetic rings used to resist interference ）;
（4）TTL The communication equipment is well grounded ;
（6） Isolate the communication module with a metal shell .
（5） If long-distance transmission , Switch to RS485（ Shielded twisted pair ） Long distance stable transmission .