Note: If the Format value is changed, the Control Field and Coded Expres-
sion change to the default values for the given Format value. The user can
only change the Control Field field and Coded Expression field to allowed val-
ues for the Format field.
It is recommended that the SecureSync administrator/operator only use this if they do not
know what the IRIG Input Format is, and they wish to identify the signal type, or to determ-
ine if a signal is present.
Local Clock: The incoming IRIG input time information may be provided as local
time, but System Time may be configured as UTC time, so internal computations
need to be performed. With the Timescale field set to “Local”, select the name of a
previously created Local Clock. The Time Zone and DST rules, as configured in the
Local Clock will be applied to the front panel time display.
Offset: Provides the ability to account for IRIG cable delays or other latencies in the
IRIG input. The Offset value is entered and displayed in nanoseconds (ns). The avail-
able Offset range is -500 to +500 ms.
Configuring the IRIG Input Year
The IRIG time source may be able to provide SecureSync with the current year information
via the IRIG input data stream. As the year value is not a required field in the IRIG data
stream, (and if the year value is present, it may not always be in the same location of the
Control Field), if the year value is contained in the control field section of the IRIG data
stream, the control field “layout” needs to be defined in SecureSync (as determined by the
Coded Expressions and Control Field values). If the year value is not present in the IRIG
input signal, the year value will need to be manually set in SecureSync when using IRIG
input as the only input Time reference.
Note: By default, the “year” fields in the IRIG message are ignored and a
user-defined value is used.
SecureSync 2400 User Manual 411
APPENDIX
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