11
Alarm relay connections along with RS422 connections.
The DuraTime RC100 master clock includes connections for power, alarm relay and Ethernet.
The alarm relay includes 10 Amp contacts. Larger loads should make use of a slaved relay.
There are two primary network types:
Periodically Active
and
Continuously Active
.
Periodically Active Wireless Network
- A clock system comprised of battery powered
secondary clocks is an example of a periodically active network. The network is only active for
10 seconds, twice daily at 02:00:40 and 04:00:40. The optional mini-master is helpful when
installing battery powered analog clocks, because the wireless network is idle most of the time.
The periodically active network requires the least amount of equipment and therefore is the most
economical. The mini-master clock is helpful when installing battery power analog clocks in a
periodically active network.
Continuously Active Wireless Network
- A system comprised of externally powered digital or
analog clocks, or any other DuraTime device that’s externally powered is an example of a
continuously active network. Each clock is always active, receiving and retransmitting data. In
this type of network, the mini-master is unnecessary when installing battery powered analog
clocks. The clock will receive a time update as soon as it is powered because the network is
always active. The advantage of the continuously active network is that the time signal is always
available when installing or replacing battery powered clocks. No mini-master is required. The
downside is there may be some additional equipment required to repeat the signal. However,
given the long range of repeaters, the additional equipment would be minimal.
A continuously active wireless network is very easy to install before installing secondary
devices. First install the master transmitter(s) as described above. Then, place the mini-master
tool in receive mode by momentarily pressing the yellow On/Off button to turn the unit on. Then
momentarily press the blue Receive Only button. The indicator light should begin blinking
every other second as it receives time broadcasts from the master clock(s). Wall repeaters and
analog clocks repeat all radio channels.
Next, walk down hallways or around the area until the signal light begins to blink irregularly,
indicating a weak signal. At this point plug in a wireless wall repeater into an outlet somewhere
between the poor signal point and the master clock. A light on the wall repeater indicates power
and blinks to indicate radio activity. Alternatively, any DuraTime externally powered device
such as an AC powered analog clock, digital clock, wireless relay/audio player/tone generator,
wireless GPS receiver, or serial interface can be used in place of a wall repeater. It is highly
