I/O PORT DATA INPUT/OUTPUT
94 = year
027.17:04:38 = time (days, hours, minutes, seconds)
M0 - mode (start-up mode)
* S00 = status code (doing GPS corrections)
* E00 = error code (system check OK)
25 00 00 00 = tracking satellite vehicle 25
-0019E-12- frequency offset measured in parts to 10
-12
33 48.8270N = latitude 33 degrees 48.8270 minutes, north
117 53.3864W - longitude 117 degrees 53.3864 minutes, west
+0028 = altitude in meters
T1 705337.512 = time interval in microseconds
* For a listing of status codes and error codes, refer to Chapter Three.
External frequency measurement or another option can be substituted for time interval if
available and previously enabled.
4.44 ENTER PRESET COINCIDENCE TIME (MODEL ET6500 ONLY)
This feature provides the ability to preset a coincidence time into the GPS Time Code and
Frequency Generator from hundreds-of-days through tenths of microseconds. When the
coincidence time equals the GPS time, a two microsecond positive going pulse is output. For the
specific output connector, refer to Chapter One.
• The user inputs $o (Hex 24/Hex 6F). (The $ is the attention/log-on character. The “o” is the
ID ASCII character).
• Then enter sixteen ASCII digits to preset the coincidence time (starting with hundreds of
days):
Example: 0562347269785673
This example shows entering the preset coincidence time of:
056 days, 23 hours, 47 minutes, 26 seconds, 978 milliseconds, 567 microseconds, and
300 nanoseconds (or 3 tenths of a microsecond).
The preset coincidence pulse occurs 200 nanoseconds late. It’s pulse width is approximately two
microseconds wide, positive edge on-time. It is capable of driving ten LSTTL loads.
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) 4-23
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