自己看NTMP01上的端口定义吧
Table PR11-1. NTMP01 P5 and P6 Pin Assignments PinSignal
1 Protective ground
2 TXD - transmitted data
3 RXD - received data
4 RTS - request to send
5 CTS - clear to send
6 DSR - data set ready
7 Signal ground
8 DCD - primary data carrier detect
20 DTR - data terminal ready