Design of Informatization College and University Teaching Management System Based on Improved Decision Tree Algorithm

Table 2

Serial interface circuit pin signal description.

Pin number	Pin name	Function description
1	DCD	Data carrier detection
2	RXD	Data receiving
3	TXD	Data transmission
4	DTR	Data terminal preparation
5	GND	Land
6	DSR	Data equipment preparation
7	RTS	Request send
8	CTS	Clear send
9	RI	Ringing indication