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Chapter 1 Front and Rear Panels at a Glance
58503B/Option 001 Front-Panel Display/Keypad at a Glance
Operating and Programming Guide 1-3
58503B/Option 001 Front-Panel
Display/Keypad at a Glance
1 An alphanumeric display for displaying time, position (i.e., longitude,
latitude, and altitude), and Receiver status. The display is a highly visible
twelve-character vacuum-fluorescent display.
2 Status LED indicators:
When the Power indicator is illuminated, it indicates that input power is
supplied to the Receiver.
When the GPS Lock indicator is illuminated, it indicates that the
Receiver is tracking satellites and has phase-locked its internal reference
to the reference provided by GPS.
When the Holdover indicator is illuminated, it indicates that the Receiver
is not phase-locking its internal reference to the reference provided by
GPS. Typically, this would happen due to loss of satellite tracking.
When the Alarm indicator is illuminated, it indicates that the Module has
detected a condition that requires attention.
3 Eight MODE keys with associated LEDs for front-panel access to time,
position, and status information: Time, Long (longitude), Lat (latitude)
Alt (altitude), Sat (number of satellites tracking), Status (Receiver or
system status), and Serial Port (serial port settings). Each key selects a
different display mode. Also, pressing Shift and Alt key in sequence clears
instrument alarm.