[Retracted] Application Practice Analysis of Ice and Snow Sports Training Assistance System Based on Internet of Things

Table 1

Pin function table.

Pin	Signal	Definition	Effect
1	DCD	Carrier signal	Informs the DTE that it is ready to receive
2	RXD	Receive data	Receive serial data
3	TTXD	Send data	Send serial data
4	DTR	Data terminal preparation	Indicates that the data terminal is available
5	SGD	Signal ground	For grounding
6	DSR	Data preparation	Indicates that MODEM is available
7	RTS	Request to send	Control send state
8	CTS	Clear to send	Indicates DEC status
9	RT	Bell alert	Notification terminal