Utstar pn820 User Guide

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Some programs can connect only though a serial (COM) port. This 
can be true even if the device itself is Bluetooth-enabled. To make it 
possible for such programs to use a Bluetooth connection, you must set 
up a virtual COM port. Once created, this virtual port can be used like 
any other COM port. You can use a virtual COM port for programs that, 
for example, connect to a GPS receiver, or to connect to a Bluetooth-
enabled printer.

Here are some examples of how to use incoming and outgoing virtual 
COM ports.

You have a program on your device that cannot use Bluetooth directly 
but can print to a serial (COM) port. You can create a Bluetooth 
partnership with a Bluetooth-enabled printer, and then set up an 
outgoing COM port (for example, COM 1). The program can then send 
print data to COM 1, which reaches the Bluetooth-enabled printer.

You have a Bluetooth-enabled GPS receiver, and your device has a 
GPS tracking program that expects to receive GPS data over a serial 
(COM) port. You can create a Bluetooth partnership with the Bluetooth-
enabled GPS receiver, and then set up an incoming COM port (for 
example, COM 2). The GPS program can then send data to COM 2, 
which reaches the GPS receiver.

Even if both your device and another Bluetooth-enabled device contain 
programs that need to use serial ports to communicate, you can set 
up the appropriate virtual incoming and outgoing COM ports on each 
device so that the programs can to use a Bluetooth connection to 
communicate.

Create a Bluetooth partnership

Set up an incoming Bluetooth COM port

Set up an outgoing Bluetooth COM port