SELENA Multifunctional LED Clock USER MANUAL V32D
KERA TECHNOLOGIES INC. 2013 www.ledclocks.com
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Clock Configuration Table for the SELENA Time Sync protocol :
Fn32 Fn33 Fn34 Fn89 Fn88
OFF ON ON X X SLAVE: repeats the display data from the Master clock screen, but also
synchronizes its internal clock to the time data from the Master
OFF OFF ON X X SLAVE: synchronizes its internal clock to the time data from the Master
OFF ON OFF X X SLAVE: only repeats the display data from the Master clock screen
ON ON OFF OFF X MASTER: transmits the data all the time at 9,600 or 1,200 (or 4,800) Baud
ON ON OFF ON X MASTER: transmits the data every 1 second at 600 or 300 Baud
ON OFF OFF OFF X MASTER: transmits the data all the time at 9,600 or 1,200 (or 4,800) Baud
ON OFF OFF ON X MASTER: transmits the data at every 5th second of each 10 second
period at 600 or 300 Baud
Where: X = Don’t care
Selection of the Serial Communication speed ( Baud rate ) for all serial protocols:
Fn89 Fn88
OFF OFF 9,600 Baud
OFF ON 1,200 ( or 4,800 ) Baud
ON OFF 600 Baud
ON ON 300 Baud
2-WIRE MASTER – SLAVE SYSTEM INSTALLATION ( RS485 or RS232 )
( Optional Feature )
A twisted pair, 2 conductor 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
or physically.
Normally, up to 64 clocks (or optionally up to 400 clocks) can operate within a single communication network wiring without
any additional signal boosting. It is advisable that for each 64 slaves at least one Opto-Repeater be used to amplify the
signal. Such repeater is an Option # 841 in the SELENA systems and is installed inside the clock that is purchased with that
option. Alternately, a third party RS485 or RS232, or other standard signal booster/repeater may be used to improve the
signal quality or strength.
Clocks that are not enabled as slaves may continue to operate in the Stand Alone mode.
For the SELENA Sync Standard Protocol:
To keep the Slave clocks synchronized with the Master, setup the appropriate function as listed in the Clock
Configuration Table or use the sync repeater configuration.
See the Sync Repeater function description in this manual.
MASTER – SLAVE SYSTEM INSTALLATION with PC as the MASTER
( Optional Feature )
A PC may be used as the MASTER for the entire clock system.
SELENA clocks do not have to be synchronized all the time. A sync signal every several hours may be sufficient to keep all
clocks working within one second accuracy. Also, when the power is interrupted and later restored, SELENA clocks will
continue to count the time accurately thanks to the internal battery-less (or optional Lithium battery ) backup.
All communication methods are possible to be used in a configuration with the PC as the Master as follows:
1) The PC may send the sync to an External Power Line Modem ( with RS232, RS485 or USB input ) that sends the
signal to the slaves through the power line wiring. In this case the slaves have to have the Power Line Modem
receiver option installed.
2) The PC Master may send the sync to the first Slave that has a compatible RS232, RS485 or USB input and then
that slave will broadcast the sync signal into the power line wiring through its internal Power Line Modem. In this
case the slaves have to have the Power Line Modem receiver option installed.
3) The PC may send the sync to an External RF Modem ( with RS232, RS485 or USB input ) that sends the signal to
the slaves through radio. In this case the slaves have to have the RF Modem receiver option installed.
4) The PC Master may send the sync to the first Slave that has a compatible RS232, RS485 or USB input and then
that slave will broadcast the sync signal through radio with its internal RF Modem. In this case the slaves have to
have the RF Modem receiver option installed.
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