Model: MC-1-M (2U)
Doc. Ref. no. : m05/om/101
Issue no. 14
User’s Manual
Page 38 of 103
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Few seconds after GPS unit is powered up, 1PPS LED will start flashing in RED color which indicates
the Pulse per second output available.
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When the time gets displayed on unit display, all other outputs will become active.
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All messages showing unit LOCK/UNLOCK status, position information, day of year, day, COM2
terminal time frame format are displayed in rotation in last 2 lines of LCD.
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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 Master Clock Model MC-1-M device will get
reset to default time (Time: 23:59:59 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 according to the default time. The
time will only be corrected after GPS Master Unit gets in LOCK condition after GPS antenna is
connected to device.
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There are other 4 status LED’s on front panel of GPS Master Clock Model MC-1-M device. When
Power is applied to the device, GPS LOCKED indication illuminates in GREEN color. 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 to get GPS lock will depend on start mode of GPS receiver whether
GPS receiver is in Cold start or Warm Start or Hot start mode.
