rs-485 is what serial bus.
1, the maximum data transmission rate of RS-485 is 10Mbps.
2, RS-485 interface is a combination of balanced driver and differential receiver, anti-common-mode interference ability is enhanced, that is, anti-noise interference is good.
3, the maximum communication distance of RS-485 is about 1219m, the maximum transmission rate is 10Mbps, the transmission rate is inversely proportional to the transmission distance, under the transmission rate of 100Kb\/S, the maximum communication distance can be reached, if you need to transmit a longer distance, you need to add 485 repeater. RS-485 bus generally supports a maximum of 32 nodes, if the use of special 485 chip, can reach 128 or 256 nodes, the maximum can support up to 400 nodes.