SELENA
Multifunctional LED Clock
USER MANUAL V32D
KERA TECHNOLOGIES INC. 2013
www.ledclocks.com
36
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.
