Model: MC-1-M (2U)
Doc. Ref. no. : - m05/om/101
Issue no. 14
Page 39 of 103
User’s Manual
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GPS Master Clock Model MC-1-M device provides relay contacts on its terminal at back panel of unit
for Power, GPS Lost and Watchdog output. Factory set configuration for relay contacts for all three
mentioned outputs is C-NO terminal.
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After GPS Master Clock Model MC-1-M device is Power ON, Power relay output is energized.
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After time is displayed on device display, watchdog relay contact gets energized after 5 to 6 seconds.
Watchdog relay status indicates the healthy functionality of unit. If unit becomes unhealthy, the
watchdog relay output will be off after few seconds and watchdog LED in front panel will be ON. It will
maintain its output status till the unit regains its healthy status.
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If GPS Master Clock Model MC-1-M is in LOCK condition, GPS LOST relay will be in energized
condition and GPS LOCK led on front panel will be ON.
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All other event outputs including standard event output and additional event outputs (optional) are ON
as per respective event time configured. Standard event output is configured at every 1 minute event
and 1 sec event ON period.
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Factory set setting of all additional event outputs (optional) are set as 60 seconds event time with 50
milliseconds event ON period.
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Time and date displayed on unit will be in I.S.T. format (UTC + 5:30 hrs)- Indian Standard Time
format and all other parameters such as gps lock status, gps parameters and other will be display in
sequence at 10 seconds interval.
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Once unit is Power up and time is displayed, unit will start transmitting serial NMEA frame on COM1
terminal located at back panel of unit. NMEA output communication settings will be at 9600, 8, N, 1.
NTP outputs will be at configured factory set factory IP address and will be active once NTP client
request are received on particular NTP port. IRIG-TTL output will be at TTL voltage level i.e. 0(low
level) and 5V(high level) and IRIG-AM (Amplitude Modulated) output will be available at 3.6Vpp.
8.4 Basic Normal Run Mode Operation
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After unit is boot up completely and time is available on display, all the outputs of unit i.e. event pulse
outputs, IRIG, NTP and serial time outputs will be available as per unit clock.
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GPS Master Clock Model MC-1-M size unit display supports 20 x 4 lines LCD which displays
parameters such as time, date, GPS LOCK/UNLOCK status, position information, day of week, day of
year, type of serial frame format on COM2 terminal.
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Parameters such as Time and Date are always displayed on First 2 lines of LCD display.
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Other parameters such as GPS LOCK/UNLOCK status and total satellites visible by receiver are
display on 3
rd
line of display. These two parameters are displayed in rotation as per fixed interval.
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Parameters such as position information, day of week, day of year, type of serial frame format on
COM2 terminal are displayed on 4
th
line of display. These parameters are also displayed in rotation
as per fixed interval.
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During normal run mode of GPS Master Clock Model MC-1-M, there are several messages displayed
on LCD screen of unit as per condition prevail. Below are messages which are available on display
screen of unit.
