CR Carriage Return
LF Line Feed
I Time Sync Status (space, ?, *)
Q Quality Indicator (space, A, B, C, D)
YY Year without century (99, 00, 01, etc.)
^ Space separator
DDD Day of Year (001-366)
HH Hours (00-23 UTC time)
: Colon separator
MM Minutes (00-59)
: Colon separator
SS (00-60)
. Decimal separator
SSS Milliseconds (000-999)
L Leap Second indicator (space, L)
D Daylight Saving Time Indicator (S,I,D,O)
The leading edge of the first character (CR) marks the on-time point of the data stream.
The time synchronization status character (I) is defined as described below:
? When the receiver is unable to track any satellites and the time synchronization lamp is red.
* When the receiver time is derived from the battery backed clock or set manually through the Setup Port
Interface.
The quality indicator (Q) provides an inaccuracy estimate of the output data stream. When the
receiver is unable to track any GNSS satellites, a timer is started. "Quality indicators" on the
facing page lists the quality indicators and the corresponding error estimates based upon the
GNSS receiver 1PPS stability, and the time elapsed tracking no satellites. The Tracking Zero
Satellites timer and the quality indicator reset when the receiver reacquires a satellite.
Quality Time (hours) TXCO Error (milliseconds)
OCXO Error
(milliseconds)
Rubidium Error
(microseconds)
Space Lock <1 <0.01 <0.3
504 SecureSync User Reference Guide
APPENDIX
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