SERTEL T-GPS-300, Operation Manual

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The time information is coded as follows :
Bits 0 - 14 : always=0;
15 : quality of radio-synchronization : good =1, bad =0;
16 : upcoming time change : normally=0, before time change=1;
17 : winter=0, summer=1;
18 : winter=1, summer=0;
19 : always=0;
20 : always=1;
21-27 : minute (of next minute);
28 : combines with bits 21-27 for even parity;
29-34 : hour;
35 : combines with bits 29-34 for even parity;
36-41 : day of the month;
42-44 : day of the week (Monday=1);
45-49 : month;
50-57 : year;
58 : combines with bits 36-57 for even parity.
59 : the pulse is missing (minute identifier).
By menu, the GPS unit may be programmed to stop delivering the DCF code when GPS
synchronization is bad.
Minute Pulses, Time Marks :
Minute pulses duration gives following indication :
Length Indication
1 second Minute mark when GPS synchronization OK
2 seconds Minute mark when GPS synchronization NOT OK
4 seconds Minute mark at the full hour (local time)
10 Seconds Minute mark at 24.00 o'clock (local time)