1. what is rs232?
The RS-232 standard interface (also known as EIA RS-232) is a commonly used serial communication interface standard. It was jointly developed by the Electronic Industry Association (EIA), Bell Systems, modem manufacturers, and computer terminal manufacturers. Jointly formulated in 1970, its full name is "Technical Standard for Serial Binary Data Exchange Interface between Data Terminal Equipment (DTE) and Data Communications Equipment (DCE)"
2.RS232 9-pin serial port definition
The nine-pin serial port is the RS232 interface, one of the communication interfaces on a personal computer. It is an asynchronous transmission standard interface established by the Electronic Industries Association (EIA). Usually, the RS232 interface appears in 9 pins (DB9) or 25 pins (DB25). Generally, there are two sets of RS232 interfaces on personal computers, COM1 and COM2.
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