When you issue a MODE command at a CMD prompt, as in MODE COM1, the following data is returned:
   Status for Device COM1:                                 -----------------------                                  Baud:            1200                                  Parity:          Even                                  Data Bits:       7                                  Stop Bits:       1                                  Timeout:         OFF                                  XON/XOFF:        OFF                                  CTS handshaking: OFF                                  DSR handshaking: OFF                                  DSR sensitivity: OFF                                  DTR circuit:     ON                                  RTS circuit:     ON
The above are the default values for a COM port.

When you start an application that resets these values, they remain in effect until reset by another application.

When you restart your computer, the default settings are in effect.