Model: MC-1-DE
Doc Ref. No:-m05dom102
Issue No:-00
Page 29 of 76
User’s Manual
7.2 Battery Backup RTC and GPS receiver RAM Configurations:
Backup batteries are used to keep the RAM and the Real-Time Clock (RTC) in the receiver running
even after unit Power OFF to retain setup and status information, Time, Date, Last Calculated Re-
ceiver Position, Almanac and Ephemeris information along with receiver specific parameters allowing
resumption of GPS operation automatically once unit mains power is restored. In this “Warm Start”
scenario when the unit power is restored, the receiver scans the RTC to check how much duration
has elapsed since power was removed, calculates which satellites should be visible using the pre-
vious stored almanac information and then proceeds to develop fix information providing data.
The battery is a maintenance
‐
free rechargeable Manganese lithium type. A built
‐
in battery charging
circuit is used when the unit is powered on, eliminating the need for maintenance.
Battery Specification:
Manganese lithium, 3.6 volts, 17 mAh,
Memory Retention Time: 15 days (approx.)
It is recommended that if GPS TIME SYNC UNIT MC-1-DE unit was
in Power off condition for the duration more than specified Memory
retention time, user should allow to keep unit in Power ON condition
for 72hours to charge the RTC backup battery to full level.
Non Volatile Memory Configuration:
The GPS Time Sync Unit maintains its all configuration parameters internally in non
‐
volatile memory,
even when the power is off.
7.3 Startup Operation
Before powering up GPS Time Sync Unit MC-1-DE Model device, user has to ensure that power
supply connections are done properly. When power is applied, below is basic start up sequence of
GPS Time Sync Unit MC-1-DE Device.
•
While GPS is in Power off, all the outputs are disabled.
•
As soon as Power is applied, GPS POWER LED in “Red” color on front panel illuminates.
•
Few seconds after GPS unit is powered up, 1PPS LED will start flashing in RED color which
indicates the Pulse per second output available.
•
After some time all other outputs will become active.
•
If unit was in Power OFF conditions for duration longer than required as per battery backup
requirement (refer section 8.1 and 8.2), the time of GPS Time Sync Unit MC-1-DE device will
get reset to default time (Time: 23:59:56 and Date: 21/8/99), in such case all outputs such
as time on display, NTP, IRIG-B, serial time outputs, all event outputs will be not available.
The time will only be corrected after GPS Time Sync Unit Unit gets in LOCK condition after
GPS antenna is connected to device or correct time (manual time) is entered through telnet
or serial configuration. Manual time setting is explained in the later stage of the manual as
well as m05dom_Appendix E1_rev01.
•
There are other 2 status LED’s on front panel of GPS Time Sync Unit MC-1-DE device. When
Power is applied to the device and If GPS Antenna is connected, after few minutes, GPS will
get Lock and will be indicated by GREEN indication on GPS LOCKED LED. The time taken
