You are currently offline, waiting for your internet to reconnect

COM Port Settings in Control Panel vs. Command Prompt

This article was previously published under Q112841
The COM port settings in the Ports option of Control Panel have no effecton COM port settings used in a command prompt window.
MODE.COM queries the port directly. Default settings are the following:

   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				

Applications reset the mode of the COM port(s). If, for example, you startTerminal and reset COM1 to 14400 baud, 7 data bits, odd parity, then exitTerminal, the new settings remain in effect until the computer is shutdown. Upon rebooting, the default settings are once again in effect. TheControl Panel settings, on the other hand, affect the registry. Anapplication that is appropriately written can query the registry for thesevalues and use the Control Panel settings. The default settings in thePorts option of Control Panel are:

   Settings for COM1:   -------------------   Baud Rate:     9600   Data Bits:     8   Parity:        None   Stop Bits:     1   Flow Control:  None				
prodnt 3.1 3.5 4.0

Article ID: 112841 - Last Review: 02/20/2007 03:35:00 - Revision: 2.2

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.5
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 3.5
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0 Standard Edition
  • kbhardware KB112841