Irig E Output - Safran SecureSync 2400 User Manual

APPENDIX
The straight binary (SB) time-of-day code word normally found between pos-
ition identifiers P
ition identifiers P
5.5.4

IRIG E Output

The IRIG E code contains the Binary Coded Decimal (BCD) time of year and Con-
trol Functions. The figure IRIG E Time Code Description illustrates the IRIG E data
structure. The BCD time of year provides the day of year, 1-366, and time of day
to tens of seconds. The hour of the day is expressed in 24 hour format. The Con-
trol Function field includes a time synchronization status bit, year information
and SBS time of day.
Element 55 is the time synchronization status bit. Element 55 is a Binary 1 when
the front panel time synchronization lamp is green, and a Binary 0 when the lamp
is red.
600
and P is eliminated for FAA IRIG B. All elements between pos-
8 0
and P are set to Binary 0.
8 0
Time frame: 10 seconds.
Code Digit Weighting:
Binary Coded Decimal time of year.
Code world - 26 binary digits.
Tens of seconds, minutes, hours, and days.
Recycles yearly.
Code Word Structure: BCD word tens of seconds digits begin at index
count 6. Binary coded elements occur between position identifier elements
P0 and P5 (3 for seconds, 7 for minutes, 6 for hours, and 10 for days) until
the code word is complete. An index marker occurs between decimal digits
in each group to provide separation for visual resolution. Least significant
digit occurs first.
Control Functions: IRIG formats reserve a set of elements known as Con-
trol Functions (CF) for the encoding of various control, identification, or
other special purpose functions. IRIG E has 45 Control Functions located
between elements 50 and 98. The SecureSync uses the Control Function
field to encode year data, time synchronization status, and SBS time data.
Table B-2 lists the Control Function Field and each element's function.
SecureSync 2400 User Manual