The so-called industrial bus, that is, between the modules or devices to transmit information, communication between a set of common signal line collection, is the system under the control of the master control device, the sending device to send information accurately transmitted to a receiving device of the signal carrier or public **** access. In China: the general common bus chip is nothing more than 485 communication chip, CAN communication chip, in fact, this high and low voltage level way of transmission of communication bus is not stable, used in industrial products is not very suitable. But some people ask: why so many people are using it? That's because 485 and CAN into China has been a few decades, that time China does not have its own bus technology, the first into the main well, engineers are familiar with the two bus technology. I am also an engineer, according to my understanding, China now also has its own centralized bus communication chip, for example: I am currently using the Beijing Strong Union Communication Technology Co.
There are also some domestic imitation M-BUS chips, but this chip can only provide small current.