I/O PORT DATA INPUT/OUTPUT
4 digits of ten thousandths of minutes longitude.
E or W (space).
+ or -.
4 digits of altitude in meters CR/LF.
Example: 33 48.8241N 117 53.3970W +0026
4.7 CLEAR EVENT DATA
This command clears any previously stored events from memory, if the event option has been
installed in the unit.
• The user inputs $j (HEX 24/HEX 6A).
• The unit will respond with OK, followed by CR/LF.
4.8 PRINT EVENT DATA
The GPS Timing Unit has the optional capability of storing up to 256 events from up to three
inputs (channels). When the command is sent to print the event data, the first response is three
characters representing event status. The user responds with a % character. This is followed by
the unit outputting the event number, the channel number, and the time the event occurred.
When this first event has been output, the user must respond with a % character within three
seconds signifying the event information has been taken. The unit will then output the second
event.
This process of outputting the data followed by the user’s response (%) continues until all events
have been output. If the user does not take the data and respond with a % within three seconds,
communication with the GPS timing unit will terminate. If no data is available, the unit will
respond with a question mark. If more than 256 events occur, subsequent events will be lost or
overwritten. If two events occur very close together, it is possible that one of the events could be
missed. If that happens, the fact that an event has been missed will be reported in the event
status. Table 4-4 shows the possible event status codes.
Table 4-4
Event Status Codes
Code Definition
S00 Normal.
S02 Missed event Channel One.
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) 4-7
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