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RS485 access control signal transmission problem
2022-02-02 20:03:51 【CSDN Q & A】
Excuse me, ,rs485 Access control system , I use the computer board to detect that it is normal , After all connections, some boards can't transmit signals , Only a few of them can communicate normally , Break the back several , There is , Ask the great God for help and guidance , I am a novice
Refer to the answer 1：
Guess possible problems ：
1.rs485 Link... Hand in hand , Use twisted pair （ If the electromagnetic signal is not good, use shielded wire ）;
2. Baud rate , If the distance is longer , Don't have a high baud rate , Optional 9600 Or a little lower ;
3.rs485 The time interval between half duplex transmission or reception , Multiple boards , When data is transmitted , You need to leave enough communication time , And when the computer sends data , Of all other boards RS485 Should be controlled to receive . Only one board can send data on the bus at a time , Please determine the timing of sending each board .
Refer to the answer 2：
author[CSDN Q & A],Please bring the original link to reprint, thank you.
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