Table of Contents
Advertisement
Number of receivable
satellite signals
6
5
4
3
2
1
0
Power ON
5.2 Time Data Output
On power-up, time data (serial data consisting of year-month-date and hour:minute:second) is
output from the receiver's internal RTC (real time clock).
If satellite signals are received, then time data transmitted by the satellite (i.e., GPS time) is
output until acquisition of the almanac data is completed. The GPS time deviates from UTC time
by an accumulated number of leap seconds.
When reception of the almanac data is completed, then UTC time is output.
Any device receiving this output data can distinguish between the RTC, GPS and UTC time data,
since this is indicated in the data itself.
Five receivable
satellite signals
Four receivable
satellite signals
Almanac data reception
(12 to 30 minutes)
Figure 5.1.1
Receiving Satellite Signals and 1PPS Output Status
One receivable
satellite signal
Stop
1PPS output
1PPS output
1PPS stop
11
6 F 2 S 0 7 3 8
Two receivable
satellite signals
Time
1PPS output
(In the case of normal mode)
1PPS output
(In the case of high-
reliability mode)
Advertisement
Table of Contents
