21
L = Leap second Indicator ( Space, L )
HdHd = UTC time difference hours ( 00 - 23 )
MdMd = UTC time difference minutes ( 00 - 59 )
D = Daylight Savings Time indicator ( S,I,D,0 )
TZ = Time Zone
XX = Time Zone Switch Setting ( 00-23 )
If a SELENA clock is used as the
Master
, that clock should be setup as follows:
A.
To use as Master in Standard SELENA Time Sync communication protocol enable Fn 32 only
B.
To use as Master in ASCII Time Code Format “0,1,2 or 3” enable both Fn 32 and Fn 46 and select required
Format with Functions Fn 11, Fn 12 and Fn 13. Note that only Format 0 and 3 may be selected for the
Master.
NOTE: ONLY
ONE
MASTER IS ALLOWED TO OPERATE ON THE SAME NETWORK OR A COLLISION WILL OCCUR.
A Twisted Pair cable must be connected
“IN PARALLEL”
to all clocks in the system. Additional clocks may be added at any
time and/or taken away from the system either by Selecting/Deselecting the appropriate Sync. Control functions (Fn 32, 33
and 34 as needed ) or physically.
Clocks that are not enabled as slaves may continue to operate as stand alone.
Normally, up to 64 clocks can operate within single communication wiring without additional signal boosting. It is adviseable
that for each 64 slaves one
Opto-Repeater
be used to amplify the signal. Such repeater is an Option in SELENA systems and
is installed inside the clock that is purchased with that option.
In any configuration and type of Master used, a clock with Repeater should be installed within the system as shown in figure
below.
