串口发送一串字符\51usb.h ................\main.c ................\main.LST ................\main.OBJ ................\RS232 ................\RS232.hex ................\RS232.lnp ................\RS232.M51 ................\RS232.Opt ................\RS232.plg ................\RS232.Uv2 ................\串勣调諕冩手V2.2.exe 串口发送一串字符