SELENA
Multifunctional LED Clock
USER MANUAL V32D
KERA TECHNOLOGIES INC. 2013
www.ledclocks.com
37
The
Master PC
may
broadcast
the sync signal
directly
into the slave network
or
it may send the sync to the
First Slave
that
is setup as the
Sync Repeater clock
which will then broadcast the signal to other slaves and / or repeaters.
Consult the particular communication protocol since not all are allowed to use the sync repeater functions.
For the SELENA Sync Standard Protocol:
The software driver package “
PCT2Kera.exe
” must be installed on the
Master PC
to allow it to send the internal PC
clock data as the Master Synchronization signal to all slave clocks. The software works in background (if properly
installed) and has several features that may be customized by the user.
In order to have the whole system synchronized with, for example, the Atomic Clock time or a GPS Atomic Time, another
widely available software package may be installed on the same PC that will allow for updating of the internal PC clock
through the internet, a special WWVB ( or other Time Broadcasting radio stations ) receiver card, a GPS or a network, or
manually.
MASTER – SLAVE SYNC SIGNAL RANGE EXTENDER – REPEATER configuration
using SYNC REPEATER function Fn 53
( Optional Feature )
In some installations the sync signal may become deteriorated due to the long distance of wiring or weakening of the RF signal
in RF communication etc... In such cases SELENA clocks can be setup to extend the signal range by repeating the Master
sync signal at different “Time Slots” than the original Master transmission.
The repeater function, when enabled, will cause the selected clock(s) to retransmit the sync signal at various times
( channels ) during each minute. NOT ALL slaves should be set up with this function enabled. Only a few slaves should have
this configuration at locations where the sync signal becomes too weak for the slaves farther down the sync path.
The “Repeater” slaves must have the functions
Fn 34 and Fn 53
enabled and the appropriate Repeater Channel selected.
All other slaves in the system must have either the function
Fn 34
enabled only to receive the sync on ALL CHANNELS or the
function
Fn 53
enabled only to receive the sync on the Selected Channels only.
NOTE
, that irregardless of the settings,
ALL SLAVES ALWAYS “listen”
to the sync signal on the
05th second
of each
minute.
See the table below:
Fn32 Fn33 Fn34 Fn53
ON
X
OFF
ON
The SELENA Master clock transmits the sync at each 05th second of each minute
OFF
X
ON
ON
The slave REPEATER clock LISTENS at the “NN-1” channel and retransmits the sync
at the “NN” Channel
OFF
X
OFF
ON
The slave clock LISTENS at the “NN” channel
Where: X = Don’t care
To select the channel “NN”, the functions Fn54 and Fn 55 must be enabled as follows:
Fn 55
Fn 54
OFF
OFF
sync channel at 15th second
OFF
ON
sync channel at 25th second
ON
OFF
sync channel at 35th second
ON
ON
sync channel at 45th second
NOTE 1:
Remember to correctly select the
Communication Speed ( Baud rate )
by enabling / disabling the appropriate
combination of functions
Fn 88 and Fn 89
in all slaves, repeaters and the Master.
NOTE 2:
In the Master – Slave system with the
Sync Range Extenders-Repeaters
the
Master MUST NOT
transmit all the
time or at the channels that the repeaters use themselves for retransmission.
ASCII TIME CODE protocol
( Optional Feature )
To select the format for the ASCII Time Code protocol,
Enable the function Fn 46
and set the following functions as required:
Fn13
Fn12
Fn11
Format “0”
OFF
OFF
OFF
SELENA may be set as a Slave ( Fn 34 ) or as the Master ( Fn32 )
Format “1”
OFF
OFF
ON
SELENA may be set as a Slave only ( Fn 34 )
Format “2”
OFF
ON
OFF
SELENA may be set as a Slave only ( Fn 34 )
Format “3”
OFF
ON
ON
SELENA may be set as a Slave ( Fn 34 ) or as the Master ( Fn 32 )
Lathem Format
ON
ON
ON
SELENA may be set as a Slave only ( Fn 34 )
It is required that the Data Packets must be broadcast with a gap between them of at least 100 ms of no data. Otherwise the
