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Please see the current Duet3D documentation at
Editing Step 4 —

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This step is for Windows users only! Mac OS and Linux users skip this step.

Download YAT here. Install YAT using default options, then open it. If the Terminal Settings screen doesn't open automatically, select "Terminal" menu, then "Settings".

Select the correct COM port as the Serial Port.

If unsure of the COM port number, press Windows Key + R on your keyboard and type devmgmt.msc

Your Duet will be listed under Ports (COM & LPT) as USB Serial Device (COM#) or similar. Use COM# as the Serial Port in YAT.

Set YAT to use <LF> as the end of line character. This will improve the readability of the messages coming from the Duet. Click "Text Settings" in the "Terminal Settings" and change "EOL sequence:" to <LF>. Click "OK" to close Text Settings. Click "OK" again to close Terminal Settings.

Select "Terminal" menu, then "Open/Start" to connect to your Duet. Or click the green tick in the tool bar. If you are connecting to a Duet 2 WiFi or Duet 3 Mini 5+ WiFi, you may see lots of "WiFi reported error: no known networks found" messages. Don't worry, that's normal, and it means that the Duet is working!

Some users have reported issues with YAT under Windows 8 not connecting properly. If YAT does not work, try Pronterface to confirm the computer can talk to the Duet

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