1. Understanding GPS output from a LINCWorks device

2. If there is no password set on your device you must complete this step…if you have already setup a password to login to your device please skip ahead to slide 5 Connect to your LINCWorks RDA or VAN either through Wifi or the RDAs Ethernet port Open a web browser and type in 192.168.1.1 into the url box If the yellow box displayed below is shown, you will know your device has no password set –Proceed to login by leaving the password field blank Setting the admin password using the GUI

3. Password setup cont… Click the link in the yellow box, ‘Go to password configuration’ Setting the admin password using the GUI

4. Password setup cont… Enter in the password of your choice in both boxes –Make sure to remember this password as you will need it later on Scroll down to the bottom of the screen and click Save and Apply Setting the admin password using the GUI

5. The GPS output comes through a virtual COM port and must be viewed using a telnet client such as PuTTY which is the preferred method for LINCWorks products PuTTY can be downloaded for free from http://www.putty.orghttp://www.putty.org Connect to the LINCWorks RDA or VAN using the Wifi network or Ethernet port Enter the IP address 192.168.1.1 and port 22 into PuTTY as shown on the right Viewing the GPS output

6. GPS viewer cont… Login as ‘root’ and enter the password you have set using the GUI –Refer to slide 2 if this is not complete The password will not display as you type but is still being entered Viewing the GPS output

7. GPS viewer cont… Enter the following command and hit enter –cat /dev/ttyUSB1 Remember the command is case-sensitive After you type this command and click enter you will begin to see the GPS output Viewing the GPS output

8. The following slides will show examples of PuTTY outputs of GPS before a lock and after A LINCWorks device that is not connected will display text similar to the screenshot on the right The key to knowing you are not fully connected is the ‘*78’ on a line by itself –If this is displaying, you do not have GPS lock Know when you are connected

9. This slide shows an example output of when your device has established a GPS lock As seen on the right, the ‘*78’ is gone and is replaced by free flowing text Know when you are connected

10. This slide will continue to use the connected screenshot The most important statistic here is $GPGSV and is explained below where 1 is first number before the comma, 2 is the second and so on –1 = Total number of messages of this type in this cycle –2 = Message number –3 = Total number of satellites in view –4 = Satellite PRN number –5 = Elevation in degrees, 90 maximum –6 = Azimuth, degrees from true north, 000 to 359 –7 = SNR, 00-99 dB (null when not tracking) –8-11 = Information about second SV, same as field 4-7 –12-15= Information about third SV, same as field 4-7 –16-19= Information about fourth SV, same as field 4-7 Understanding what these numbers mean

11. This slide is using the output screen with no GPS lock The most important statistic is highlighted in the previous slide, the GPS to receiver SNR –When acquiring a GPS lock this number should stay above 30, preferably above 35 to acquire a rapid lock –After acquiring a GPS lock, this number can dip below 30 and will stay connected down to the low 20s As you can see in the GPS example on the right, under the $GPGSV stat; the 7 th number (SNR) is blank or null meaning it is too low to even track the satellite You will know your GPS is near a lock when this number appears on your output –Many times this lock happens so fast you won’t even notice Understanding what these numbers mean