针脚定义: COM RS-232/485M22 晖脚宦义: RS-232 RS422 RS^85 Pin Signal Name Signal Name Sign討Name 1 DCD Tx- DATA* 2 RxD Tx+ DATA* 3 TxD Rx+ NC 4 DTR Rx- NC 5 GND GND GND 6 DSR NC NC 7 RTS NC NC 8 CTS NC NC 9 Rl NC