Windows Bluetooth Pairing for Devices Using SPP

20 Dec 2021

Many Bluetooth devices use a Serial Port Profile (SPP). Some examples of devices using an SPP include GPS receivers, EM sensors, and some barcode/RFID scanners. This article explains how to pair a device using an SPP to a Windows device with Bluetooth. It also outlines how to locate an assigned COM port number.

Bluetooth Pairing

  1. Turn on both devices.

  2. Go to Start > Settings > Devices > Bluetooth & other devices.

  3. Turn on the Bluetooth toggle.

     Windows 11

    Bluetooth Toggle.
     Windows 10

  1. Select Add Bluetooth or other device

     Windows 11

    Add Bluetooth or other device.
     Windows 10
  1. Select Bluetooth.

     Windows 11

    Selecting Bluetooth on Add a device window.
     Windows 10
  1. Locate the device in the list and select it.

  2. When prompted for a PIN, enter the assigned Bluetooth pairing code. If the device does not have an assigned code, try one of these common pairing codes:

Locate the Assigned COM Port Number

Once the device is connected to Bluetooth, locate the COM port number through More Bluetooth Options or the Device Manager.

More Bluetooth Options


  1. Go to Start > Settings > Devices > Bluetooth & other devices.

  2. Scroll down to Related settings and select More Bluetooth options
     Windows 11

    Related Bluetooth options.
     Windows 10

  3. Select the COM Ports tab to view the assigned outgoing COM port. 

     Windows 11 and Windows 10 look the same.

To use the Bluetooth connection for a specific app, select the assigned COM port in the app.

Device Manager

  1. Go to Start > Device Manager

  2. Select Ports (COM & LPT). The outgoing COM port will be listed. 

     Windows 11 and Windows 10 look the same.