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3 – Operation
14 GPStation™ User Manual
WinSat is provided to facilitate the user’s interaction with the GPStation. However, it certainly is possible to
communicate with the GPStation through DOS or a Windows-based communications program; this is discussed in greater
detail later in this section.
BOOT-UP
The GPStation’s software resides in read-only memory. As such, the unit “self-boots” upon power-up and undergoes a
complete self-test. If an error condition is detected during a self-test, the self-test status would change; this self-test status
information can be viewed in the RGEA/B/C and RVSA/B data output logs (please refer to the GPSCard Command
Descriptions Manual). If a persistent error develops, please contact NovAtel Customer Service.
When the GPStation is first powered up, no activity information is transmitted from the COM ports except for the port
prompt; the screen on an external data communications device will display one of these two messages:
Com1> if connected to COM1 port,
or
Com2> if connected to COM2 port
Either prompt indicates that the GPStation is ready and waiting for command input.
Commands are typed at the interfacing terminal’s keyboard, and sent after pressing the terminal’s Return or Enter key.
NOTE: Most valid commands do not echo a response to a command input; the indication that they have been accepted
is a return of the port prompt from the GPStation. VERSION, HELP and ? are the only commands that provide a data
response other than the port prompt.
Example:
An example of no echo response to an input command is the FIX HEIGHT command. It can be entered as follows:
COM2>fix height 550 [Return]
COM2>
The above example illustrates command input to the GPStation COM 2 port which sets the GPStation antenna height as
fixed to 550 m above sea level and causes position solutions to be constrained as 2D with height fixed. However, your
only confirmation that the command was actually accepted is the return of the COM2> prompt.
If a command is incorrectly entered, the GPStation will respond with “Invalid Command Name” (or a more detailed error
message) followed by the port prompt.
After initial boot up, you may find the following logs useful for observing the GPStation activities. While WinSat is the
easiest way to do this, you can also use DOS or a Windows-based communications program; examples of both are
provided below.
•
Use the RCCA log to list the default command settings. After the GPStation has been operational for a while, the
RCCA log will be useful for indicating status of all current command settings. Displaying the RCCA log after a
RESET will show the saved configuration (see the description of the SAVECONFIG command for more
information).
•
Use the ETSA log to monitor the channel tracking status.
•
Use the SATA log to observe the satellite specific data.
•
Use the POSA log to observe the current computed position solutions.
•
Use the DOPA log to monitor the dilution of precision of the current satellite constellation.
•
Use the RVSA log to monitor the receiver status.
•
Use the HELP command to list all available commands.
•
Use the HELP LOG command to list all available logs.