Technical data

Installation & Operation Manual GM-TTT
Page 47
3.8.3 1 ... 6: Status Data of the Reference Time
The → button permits to switch different status messages referring to the reference time to the
display for test purposes.
1 Reference time ± current offset. This permits to check e.g. the data communication. If the
display remains empty, no valid data are received.
2 Date of the reference time (the current offset is taken into account), e.g. for testing the
data communication. If the display remains empty, no valid data are received.
3 Display of the last time, when the data of the reference time indicated the “lock“ status.
If “lock“ is currently indicated, the displayed time counts upward. If this time is frozen,
the receiver has not been in the "lock" status since that time. If the time value
permanently shows 00:00:00, no "lock" status has been indicated since the power-on of
the GM-TTT, but the status display 4 can indicate a date. If the display remains empty,
no "lock" status has been indicated since the last RESET of the GM-TTT.
4 Display of the last date, when the data of the reference time indicated the "lock" status.
The date is stored in a non-volatile memory, so that the quality of the reference time
may even be checked if in the meantime GM-TTT has been switched off. If the display
remains empty, no "lock" status has yet been indicated since the last RESET of the GM-
TTT.
5 Display of the difference: reference time minus time of the internal clock in 6 digits
(minutes:seconds:frames, eventually with a minus sign). If the difference is more than
one hour, the display will indicate FF:FF:FF.
6 Display of the status data included in the serially received data.
Digit 8
Digit 7 Digit 6
Digit 5 Digit 4 Digit 3 Digit 2
Digit 1
Day
0, 1 - 7
Leap S.
-, L
iDST
-, o, F
Ant.
-, n
Lock
-, F
Zone
-, S, U
aDST
-, A, L
Day 1 - 7: Display of the current day of the week, 1 = Monday.
0: The reference time does not supply any information on the day of the week.
Leap S. Leap second:
L: The announcement of a leap second was internally accepted by the data of
the reference time, any details are described in the chapter entitled “Time
Transfer During Normal Operation and Time Jumps“.
-: no internal announcement of a leap second.
iDST DST switchover:
F: The announcement of a DST switchover was internally accepted, any details
are described in the chapter entitled “Time Transfer During Normal
Operation and Time Jumps“.
o: The announcement of a DST switchover was internally accepted, any details
are described in the chapter entitled “Time Transfer During Normal
Operation and Time Jumps“.
-: No internal announcement of a switchover.