Juniper Allegro CE Owner's Manual page 131

2) Turn on the Allegro. Tap the Start button and select
Settings|Control Panel|Communications Properties. Tap the PC
Connection tab. At the bottom of the dialog box under Connect
using:, the COM port the Allegro is set on for the connection
process is shown. If the communication port you are using is not
listed in the bottom dialog box under Connect using, tap the Change
button.
Select the correct port and baud rate from the drop-down list. Tap
on the OK button.
Windows CE Page 4-71