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Chapter 1 Front and Rear Panels at a Glance
59551A Front Panel at a Glance
Operating and Programming Guide 1-5
59551A Front Panel at a Glance
1
When the Power indicator
illuminates, it indicates that the
proper input power is supplied to
the Module.
2 When the GPS Lock indicator
illuminates, it indicates that the
Module is receiving the GPS signal
and is locked on one or more
satellite(s).
4 When the Alarm indicator
illuminates, it indicates that the
Module has detected an internal
condition that requires attention.
5 PORT 2 RS-232C, DE-9S (female)
serial interface port for local
monitoring and retrieving data
stored in the Module’s memory
data.
3
When the Holdover indicator
illuminates, it indicates that the
Module is NOT locked to the GPS
signal. The Module is keeping time
based on the internal reference
oscillator signal. The internal
reference oscillator will determine
the accuracy of the 1 PPS signal.
(See specification for Accuracy in
Holdover in Appendix F, “59551A
Specifications,” in this guide.)