Safran VersaSync User Manual page 395

Control Function field includes a time synchronization status bit, year information
and SBS time of day.
Time frame: 10 seconds.
Code Digit
Binary Coded Decimal time of year.
Code world - 26 binary digits.
Tens of seconds, minutes, hours, and days.
Recycles yearly.
Code Word
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 (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 VersaSync 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.
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.
Year information consists of the last two digits of the current year (i.e. 98, 99,
etc.). Elements 60 through 63 contain the binary equivalent of year units. Ele-
ments 65 through 68 contain the binary equivalent of tens of years. In keeping
with IRIG formats, the least significant bit occurs first.
Elements 80 through 97 are encoded with the Straight Binary Seconds (SBS)
time data. The SBS time data is incremented in 10-second steps and recycles
every 24 hours.
VersaSync User Manual
Weighting:
Structure: BCD word tens of seconds digits begin at index
Functions: IRIG formats reserve a set of elements known as Control
APPENDIX
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