针脚                信号                 类型 
1                    VCC                输出 
2                    VCC                输出 
3                    TXB                输出
4                    RXA                输入
5                    GND                输出 
6                    VCC                输出 
7                    TXA                输出 
8                    RXB                输入 
9                    GND               输出