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Posted - 25 Feb 2002 :  18:20:48  Show Profile  Email Poster
Q: I'm having trouble using the debug port. Do you have any suggestions?

A: There are a number of reasons you could be having trouble. Here are some of the most common solutions:

1. Make sure the ASCII settings in HyperTerminal are configured as follows (File->Properties->Settings->ASCII setup):

2. Here are solutions to the most common problems reported:


Nothing comes out the debug port
I only see garbage characters on the debug port.
  1. Your PC terminal should be set for 38400 baud, 8 data bits, 1 stop bit, Parity: None, Handshaking: None
  2. Confirm that your terminal program is connected (HyperTerminal displays a connection timer in the lower left status bar)
  3. Verify your serial cable is working (disconnect the non-PC end; confirm that inserting a wire between pins 2 and 3 echoes characters typed at the terminal)
I made changes to the settings but they didn't have any effect.
  1. Make sure to press OK in all dialogs after changing settings.
  2. From the Call menu or toolbar, Disconnect then Connect. HyperTerminal only applies settings when you make a new connection.
I see debug port output on my PC, but I can't type any commands at the debug menu.

Hyperterminal may even successfully transmit files.

  1. Make sure PC terminal handshaking is set to "None".
  2. Turn off Scroll Lock. Num Lock can also cause trouble. (ref: Hilgraeve support forum)
  3. Make sure you have a good serial cable
  4. After making changes, try a cold boot of your PC (sometimes the PC's serial hardware doesn't get reinitialized fully by software)
Debug port output is double spaced.
"Append line feeds to incoming line ends" in the HyperTerminal ASCII setup dialog may be checked.
When I type numbers at the debug port, I get an error message about an invalid character."Send line ends with line feeds" in the HyperTerminal ASCII setup dialog may be checked.

Further Reading

  • The paperclip test to confirm your serial port is working

  • Edited by akidder 9-Mar-2005: Add Scroll Lock tip.
    Edited by akidder 19-Jul-2006: Add link to paperclip test.
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