1314_ Serial port technology_ Basic information of RS232 communication

All learning summary ： GreyZhang/g_serial: Some serial learning notes which may be usefull in embedded system debugging. (github.com)

This is a RS232 Species pair DB9 Definition of design , If it is a simple communication function , Connect 2、3、5 Pin of . This is the simple wiring instructions I have touched before , Because I have used one before RS232 turn USB Line . Want to come , Handling of work , This interface definition should be indispensable .

The information here comes from Sogou encyclopedia , It seems not DB9 perhaps DB25 I can't talk about RS232 了 .

In industrial control , Generally, only three wires are needed . It is also consistent with my previous experience .

This is the introduction of interface standard and communication rate , It looks like compared to CAN In terms of communication , The performance is still poor .

Here comes a new knowledge point ,TTL level . It happens that I also have a plan to expand my hardware knowledge , First record it in my to learn list , Add later TTL Level learning .

The above is right RS232 A simple understanding of communication , Most of the understanding points are still in the scope of hardware interfaces and specifications . For software functions , It should be a basic serial port .