EndRun Tempus LX GPS, User Manual

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T e m p u s L X G P S U s e r M a n u a l 36
C H A P T E R F I V E
37 T e m p u s L X G P S U s e r M a n u a l
F R O N T - P A N E L K E Y P A D A N D D I S P L A Y
CPU I/O Menu
The CPU I/O Menu is an optional menu selected from the Main Menu. It provides access to the
1PPS Pulse Width, Time Code Output Format, and Programmable TTL Output. This menu will only
be displayed if one of these optional outputs is installed.
1PPS Output Setup
The 1PPS-Setup display allows you to select the pulse width for the optional 1PPS output. Factory
default is normally 1 millisecond wide. See details in Appendix H - Specifications for the 1PPS
Output.
Timecode Output Setup
The Code-Out display allows you to select the optional time code format. Factory default is normally
IRIG-B122. See details in Appendix H - Specifications for the AM Code Output.
Programmable TTL Output Setup
The optional Programmable TTL output provides user-selectable, on-time pulse rates from 1PPS
to 10MPPS, or a digital timecode. This display will allow you to choose from among the various
selections. Factory default is normally 10MPPS. See details in Appendix H - Specifications for the
Programmable TTL Output.
Synthesizer (DDS) Setup
The optional Synthesizer display allows you to select the rate for the optional Direct Digital Synthe-
sizer (DDS) Output. See details in Appendix H - Specifications for the Optional Programmable TTL
Pulse Rate Output (Synthesized Rate).
Serial Time Output Setup
The Serial Time Output display allows you to set up the parameters for the optional, once-per-second,
serial time output. See details in Appendix F - Serial Time Output .
Display Setup
This display is selected from the Main Menu and contains parameters related to the functioning of the
front-panel display. There are two parameters -- an intensity setting and a screensaver setting. The
intensity setting allows you to set the brightness level of the vacuum-fluorescent display. Display
intensity ranges from 12% to 100%. The screensaver capability allows you to increase the usable life
of the display beyond the rated 100,000 hours. When the screensaver capability is enabled, the inten-
sity will be reduced to half of its normal operating intensity when the unit has not detected a keypress
for one hour. Press EDIT to modify the intensity and screensaver settings.
Faults
This display is selected from the Main Menu and provides system fault information. When a particu-
lar fault condition is asserted it will be followed by a flashing indicator. Otherwise the fault condition
is followed by an “ok” indicator. The fault display and various fault conditions are described below:
ANT - ok POLL - ok REF - ok ENG - ok
FAULTS FLASH - ok FPGA - ok SIG- ok DAC- ok
FLASH FLASH Write - This fault indicates that the microprocessor was unable to verify a
write to the FLASH non-volatile parameter storage area. This should not ever occur