Brother CP-1800 User Manual page 17

Changing Port setting
When you reconnect or change the plug on your PC, set the port again.
1
Click on Twain, then click OK until you find the screen as below.
2
Click on Auto Detect. The most suitable port is selected automatically.
If you connect your PC COM ports to the Brother Copyboard and other
device such as Brother MFC, select the COM port that the copyboard is
connected to on the PC manually. If you set the COM port manually, select
Speed 19200bps or 38400bps.
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