OPERATION
-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 705337.516 = time interval in microseconds
* For a listing of status codes and error codes, see Chapter Four of this User’s Guide.
External frequency measurement can be substituted for time interval if available and previously
enabled.One Second Burst (RS232 ASCII Time Burst Mode Output)
This interface is configured as Data Terminal Equipment (DTE), synchronous 1PPS “Burst”
mode, using 9600 Baud. No control/handshake lines are utilized. The time word output is
shown below in Table 1. Each byte consists of one start bit, eight data bits, one parity bit (odd)
and one stop bit. However, this configuration can be changed using the front panel keyboard
switches or remotely using the RS-232 I/O.
The data transmission is serial asynchronous by character, and the ASCII character code is used.
The time information is interpreted as being UTC time.
(SOH) DDD:HH:MM:SSQ (CR) (LF)
See Table 1 for the definition of each field contained in this time information string.
Table 1
Protocol 1
Time Information
Field Definition
(SOH) Start of Header (ASCII control character).
DDD Day of Year.
HH Hours (24-hour clock).
MM Minutes.
SS Seconds.
Q Quality indicator (see description below).
(CR) Carriage Return (ASCII control character).
(LF) Line Feed (ASCII control character).
The on-time point is at the beginning of the Carriage Return character.
Quality Indicator:
This indicator is an estimation of the accuracy of the unit’s 1PPS compared to the GPS
system 1PPS.
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) 3-25
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