Reference Mode: Used to control how the reference mode operates in determining
its validity. Values are:
Primary Reference—Allows the frequency reference to be valid based
solely on its own presence.
Secondary Reference—Requires another valid reference to synchronize the
system before the frequency reference can be determined to be valid. This is
used when the frequency reference is intended to operate as a backup ref-
erence to a different primary reference source.
Frequency: Used to configure the frequency (in Hertz) of the input signal. The avail-
able Frequency range is 1KHz…10MHz in 1Hz steps.
The input frequency is measured versus internal frequency and compared to the setup
value. If the discrepancy is larger than 1kHz, the input is disqualified and not considered
valid. The frequency reference does not inherently provide an on-time point, so it relies on
the current on-time point of the system prior to its taking over for synchronization.
Frequency Input: Status Window
To view the current settings of the Frequency Input (also referred to as ‘Reference’), go
to its Status window. For instructions, see: "Viewing Input/Output Configuration Set-
tings" on page334.
The Web UI list entries for these cards are: 1PPS/Frequency BNC and 1PPS/Frequency
RS-485.
The connector number is: J1 (BNC card); J1 (RS-485 card).
The Status window displays the following settings:
Reference ID: Name used to represent this 1PPS input reference in the Reference
Priority table; see "Configuring Input Reference Priorities" on page184 for more
information on reference priorities.
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APPENDIX