Intermec CN4 User Manual page 52

Chapter 1 — Using the CN4
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3 On the Programs tab, select the COM port that you want your
programs to use to get GPS data from your CN4.
Note: COM1 and COM3 are reserved.
4 Tap the Hardware tab, and select these settings.
GPS hardware port: COM3
Baud rate: 57600
5 Tap the Access tab and select the Manage GPS automatically
check box.
CN4 Mobile Computer User's Manual