Recently, I designed a TTL to rs485 circuit, I want to make it into an automatic transceiver, but after debugging for a long time, the highest baud rate can only reach 57600. If it reaches 115200, there will be problems sending and receiving data. So ask the heroes, whether the baud rate of 115200 can be achieved when using the max485 chip for automatic transmission and reception. Is this related to the 485 chip?
Nicolaus ポストする January 26, 2021
Reduce the resistance of the pull-up and pull-down resistors on the 485 bus.
Fitzgerald ポストする January 26, 2021
Remove the pull-up resistance test;
Freida ポストする January 26, 2021
Use an oscilloscope to see if the waveform at the receiving end is distorted. This phenomenon is prone to occur if the impedance matching is not good at high speed.
