5: Function Reference
F9 – Time On Request
Note: This function is available through the command line interface only – it is not available
through the keypad.
Use function F9 to record the exact time the XL-GPS receives a request from the user.
Enter the command “F9<CR>” to prepare the XL-GPS for the user’s request. At the desired
moment, send the request to the XL-GPS by entering an upper case “T”. The XL-GPS saves
the current time-of-day, accurate to within 1ms, to a buffer, and then outputs it to the
command line interface. The XL-GPS will continue to provide the time-of-day each time it
receives a “T” until F9 is cancelled. To cancel this function, enter Ctrl-C on your keyboard.
The command line disregards any input other than SHIFT-T until it receives a Ctrl-C
command.
The time-of-day output is only available on the port, network or serial, that was used to give
the F9 command.
The default output string is as follows:
<SOH>DDD:HH:MM:SS.mmmQ<CR><LF>
where:
<SOH>
= ASCII Start-of-Heading character
<CR>
= ASCII Carriage Return character
<LF>
= ASCII Line Feed character
DDD
= day-of-year.
HH
= hours.
MM
= minutes.
SS
= seconds.
mmm
= milliseconds.
:
= colon separator.
Q
= time quality character (see the following table)
The time quality character, “Q”, is one of the following characters:
SPACE
= Time error is less than time quality flag 1’s threshold
Page 62 of 221 .................................098-00116-000 Rev. A
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