SELENA Multifunctional LED Clock USER MANUAL V32D
KERA TECHNOLOGIES INC. 2013 www.ledclocks.com
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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
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