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When the unit is operating, calculating position and has received the UTC offset data, the ALARM LED will
extinguish, indicating a normal Time Valid condition. When this occurs, the following time-related functions (if
incorporated) become available:
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ASCII Serial Time Message (Spectrum, NMEA or optional NTP) output
Programmed Output Pulse & Event Time-Tag features
Multiplexed frequency synthesizer outputs
Optional IRIG B serial time code generator outputs
Optional filtered timing pulse output
Optional auxiliary PLL clock output
SETTING OPTIONS
If you have not previously done so, you should now set the user-selectable options and parameters to suit your
requirements. The following list shows the choices with the factory default shown in parentheses:
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Mask Angle: (5 Degrees), 15 Degrees, or 20 Degrees.
Local Time Offset: ± Integral Hours (Default is 0).
Position Format: (Degrees and Minutes) or Degrees, Minutes and Seconds.
Altitude Units: Feet or (Meters).
User Time Bias: Bias in ± nanoseconds (Default is 0).
Timing Mode: Static or (Dynamic).
Multiplexer Outputs: Any one of available outputs. (Default is PPS).
ASCII Time Message Baud Rate: 1200, 2400, 4800, (9600), 19200 or 38400.
Communications Port: (COM1), COM2-6.
PPS Selection: (GPS), GPS, Filtered, Combination.
EVENT TIME-TAG OPERATION
To use the Event Time-Tag feature (ETT), perform the following steps:
1. Connect the desired external signal to the EVENT signal pin (pin 10) on the 15-pin port connector. This
must be a CMOS or TTL compatible signal.
2. Open the ETT sub-screen via the Command menu or by clicking on the ETT Status indicator or the toolbar
icon.
3. Select the ETT mode and polarity.
4. Observe the event times displayed on the screen. This is the only sub-screen in the software that can be
minimized, rather than closed.
Event times can be logged by the host computer connected to the Control Port. Select the Log to File option on the
ETT sub-screen, and choose a filename if necessary. This filename must conform to the standard MS-DOS 8.3
format. Long filenames are not supported. The file will be located in the same folder to which the application has
been installed (usually C:\TM4).
In some earlier implementations of the Intelligent Reference/TM-4™, it is not possible to use both the ETT and POP
functions at the same time. If your TM-4 has simultaneous ETT/POP capability, then both functions can operate
coincidentally.
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