GPS Module Configuration Using USB Interface and SiRFDemo

A GPS (Global Positioning system) navigation device precisely computes geographical location by receiving necessary information from GPS satellites. GPS modules are widely used in object tracking or location tracking and to indicate the path or roads available helping to reach the desired destination easily. They are used in many applications such as in aeronautics, mining and military etc. When a GPS module is configured in a system it continuously sends GPS values depending on its exact geographical locations. Then by default it will send some other information depending on their applications.

Most of the communication related engineering projects are based on the GPS module. All GPS modem need to be connected to a computer system to verify its output. This computer may be laptop or desktop or any other one. Hence depending on the computer and connector specifications, connections can be made through serial or USB ports and also via Bluetooth.

So in this article I am going to give you a brief explanation on how to configure GPS module to get desired output.

Components Required for Configuration of GPS

  1. GPS Module
  2. USB to serial Converter (If PC has no serial port)

Steps for GPS Module Configuration with USB interface

  • For the configuration of GPS, first step is downloading and installing the GPS configuration software. Here I have preferred the SiRFDemo software. Before installation please ensure that your system has the basic requirements needed.
  • Also ensure that USB to serial converter driver software has been installed on your system and then find COM port from Device manager in the control panel.
  • Now connect GPS module with your system using USB serial converter.

COM port and Baud rate

  • Then open SiRFDemo software and define COM port and Baud rate as 9600, and then click on OK button.
  • Then open Data source in the Action menu, before that please ensure that the GPS antenna is placed in the open space and not inside building.

SiRFdemo COM port conguration

  • Then you can see latitude and longitude values on the window as shown in the snapshot above.
  • Now click on ‘Switch to SiRF Protocol’ in the Action menu as shown below.

switch SiRF protocol

  • Then click ‘Switch to NMEA Protocol’ in the Action menu as shown in figure below.

NMEA protocol action

  • Now enable or disable the required NMEA sentences on’ NMEA Setup’ and then click on Send button.

NMEA details

  • Now your GPS module is restarted with configured values.


  • You can also enable VTG using this command “$PSRF103,05,00,01,01*20”.

Here I have described about the system configuration of GPS using SiRFDemo software and you have seen how easier it is for configuring GPS modem with your computer. Hope this article will be helpful for doing your GPS based engineering projects.

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