Juniper ULTRA-RUGGED FIELD PC, Reference Manual

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5. Select a numbered COM port from the list of ports
that appear. If the port cannot be created, it is in use.
Select a different numbered port.
6.
Important:
Deselect the Secure Connection option
below the list of COM ports, as shown above.
Deselecting this option ensures that the device
disconnects its Bluetooth connection only when you
tell it to.
7. Tap Finish .
Once the virtual COM port is assigned using the outgoing
Bluetooth COM port, specify the COM port assignment
within your application as explained in the user
documentation for the application. An example follows.
Suppose you are using a Bluetooth-enabled GPS receiver
with the device and a navigation program on the Field
PC. In this example, assume you have set up a virtual
COM port between the Field PC and the GPS receiver
and that you assigned the outgoing COM port as COM 6.
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