RS485 (TIA/EIA-485-A) is a widely used physical-layer serial communication standard for industrial environments. It adopts differential signal transmission over a twisted pair, using the voltage difference between line A and line B to transmit data, instead of single-ended voltage relative to ground

RS485 is one of them, which has the following characteristics:1. Using differential signals. The biggest advantage of differential input signals is that they can suppress common mode interference. Especially when the industrial environment is complex and there is a lot of interference, using differe