BRG Precision Products DuraTime RC100 Quick start guide

1
Wireless Clock System
Technical Guide
BRG Precision Products
600 N. River
Derby, Kansas 67037
http://www.DuraTimeClocks.com
[email protected]
316-788-2000
Fax: [phone]
(Patents Pending)
Updated: 8/7/2020
Our mission is to offer innovative technology solutions and exceptional service.

2
Table of Contents
OVERVIEW ................................................................................................................................................................ 3
DURATIME FEATURES AND OPTIONS .............................................................................................................. 6
PLANNING .................................................................................................................................................................. 9
INSTALLATION......................................................................................................................................................... 9
OPERATION ............................................................................................................................................................. 17
ALARM CONFIGURATION .................................................................................................................................. 21
ALARM CONFIGURATION WORKSHEET ....................................................................................................... 25
MASTER CLOCK CONFIGURATION MENU .................................................................................................... 30
ETHERNET COMMUNICATIONS ........................................................ ERROR! BOOKMARK NOT DEFINED.
COMMUNICATIONS PROTOCOL ...................................................................................................................... 55
WIRELESS GPS AND ETHERNET GPS TIME RECEIVERS .......................................................................... 56
WARRANTY AGREEMENT .................................................................................................................................. 58
INDEX ........................................................................................................................................................................ 63

3
Overview
The DuraTime wireless clock system is specifically designed for applications where precision
and reliability are of great importance. In most cases, external time updates are not required. The
RC100 includes an oven controlled oscillator with an accuracy of one second in 20 years (2 Parts
per Billion). The RC100 is factory calibrated with the U.S. Atomic clock. It will maintain time
during shipping and power outages. If greater accuracy is required, then external time updates
are required. However, the master clock is more reliable when operating solely from the internal
high precision oscillator.
If external time updates are desired, the RC100 includes an Ethernet interface to obtain NTP time
updates. An optional wireless GPS receiver is also available.
All clocks in the system will not only display the same time, but the true legal time. Any
combination of clock shapes, style or size may be synchronized. DuraTime clocks are designed
for organizations that require reliable and accurate synchronized time.
The DuraTime multi-path wireless clock system is highly reliable. The system operates on the
license-free 2.4 GHz Industrial, Scientific and Medical band. Spread Spectrum radios are used
to enhance signal coverage, along with AES 128 bit encryption to enhance security and
reliability. Multi-path wireless communications are used to propagate the time signal
throughout any size facility. The failure of any single clock will not affect the remaining clocks
in the system. Supervision is available to automatically check the operation of all wireless
devices on the system.
The system can be configured to use multiple, simultaneous time sources. For example, NTP,
GPS and the internal high precision oscillator time sources can all be used at the same time. The
standard RC100 is accurate to about 1 second in 20 years without NTP or GPS time corrections.
An optional Rubidium atomic oscillator is available that eliminates the need for NTP or GPS
updates and maintains split accuracy for the life of the system. Multiple master clocks may be
used so that if one master clock is down or loses sync, the system automatically continues to
function normally from the secondary master clock. DuraTime digital clocks include an internal
battery that will maintain the time for up to 10 years. DuraTime battery powered clocks utilize a
redundant parallel battery configuration that allows the clock to function even if a battery fails.
No other system on the markets offers this level of reliability and ease of operation.
Each master clock may be configured for a variety of time zone and Daylight Saving Rules,
including UTC (Zulu) Time, Any World Time Zone, Half-hour time zones, Enable or Disable
Daylight Saving Time, and selectable 12 or 24 hour display formats with digital intensity control
on digital clocks.

4
DuraTime Multi-path Wireless Communications
The examples listed on these pages are simplified for communicating system concepts. The number of actual clocks in a system could easily number in the thousands,
either densely located, or spread over a wide area, with complete coordination of all communications.
Signal Paths of an Active Network Installing Battery powered Analog Cocks
When the wireless clock network is active, all clocks are within range of one or
more other clocks. Each clock receives and retransmits time signals.
The wireless network can also be configured as a continuously active network by
adding repeaters and other non-battery powered devices. Simply add radio
devices in areas where the signal absent. A mini-master device can be used as a
signal monitor to determine where the network is active or where additional
wireless devices are needed to extend the network. Once the continuously active
network is configured, the mini-master is no longer required to install or replace
battery powered analog clocks.
Battery powered analog clocks need to conserve power as much as possible, so
the internal radio is put to sleep most of the time. The clock awakens the radio
for ten seconds, seven times a day to obtain and propagate the time signal.
During this on period, the clocks instantly form a wireless network, transferring
data as needed and updating the time display. A hand-held mini-master clock is
used to provide a time signal when the wireless clock network is not active. The
dashed lines indicate the radio range of the active transmitters. The mini-master
provides a time signal for the clock to reference when the batteries are installed.
Once the newly installed clock receives a signal from the mini-master, it is
synchronized with the network and the mini-master is no longer required.
Multiple-redundant Master Clocks Continuously Active Network using Digital Clocks
Multiple master clocks may be used to increase system reliability. Each master
clock can obtain time updates from multiple sources, simultaneously.
The master clocks are designed to nest on top of one another. Or, they may be
spread around the facility. Master clocks automatically communicate with one
another to determine which master clock shall be actively transmitting.
Digital clocks are externally powered and are continuously available to form a
network. Time is distributed to all clocks every other second or 43,200 times
per day. The mini-master clock can be used as a signal detector to determine if
the area to be covered is complete during and after installation. Externally
powered analog wall clocks and wall repeaters can also be used to form a
continuously active network.
Continuously Active Network with Digital and Analog Clocks Alarm/Tone Generator with an Idle Wireless Network
In a hybrid system of externally powered and battery powered clocks, the network
is continuously active between digital clocks as indicated by the heavy dashed
lines. Network communications between battery powered analog clocks is
available for ten seconds, seven times per day.
The mini-master clock is not required to install the analog clocks that are within
range of the mains powered wireless devices. The mini-master clock can be used
as a signal detector to determine if a continuously active network signal is present.
If not, simply activate the time transmissions of the mini-master before installing
battery powered clocks.
The wireless alarm/tone generator must be located with 150 feet of an actively
transmitting component of the network, such as the master clock. Open areas
such as warehouse space or manufacturing facilities may extend this range up to
330 feet.

5
Alarm/Tone Generator with a Partially Active Network Wireless GPS Time Receiver
Multiple wireless alarm/tone generators may be deployed. Each alarm/tone
generator must be located with 150 feet of a continuously active component of the
network. Open areas such as warehouse space or manufacturing facilities may
extend this range up to 330 feet.
The RC160 wireless GPS receiver will provide time updates to one or more
master clocks. The GPS translator must be located within 150 feet of one or
more RC100 master clocks (330 feet in open space construction). Each master
clock then transmits time packets to all clocks on the network. In addition, each
master clock can obtain time from public or private time servers on the network
to backup the GPS receiver. Another GPS time receiver model is able to send
time updates over the computer network to one or more master clocks. Set the
GPS receiver and master clock on different channels.
Wireless GPS Time Receiver Ethernet GPS Time Receiver
Above is an example of a dual-redundant master clock system receiving time
updates from a single wireless GPS receiver. In addition to the time updates from
the GPS receiver, each master clock is capable of receiving redundant time
updates from local or public NTP time servers. The master clocks can be stacked
on top of one another, or they may be located in different parts of the building or
campus. Set each master clock and GPS receiver on different channels.
The RC165 Ethernet GPS receiver will provide time updates to master clocks
over the customer provided Ethernet computer network. In addition to receiving
time updates from the GPS receiver, the RC100 master clock is capable of
receiving redundant time updates from local or public NTP time servers.
Ethernet GPS Time Receiver with Redundant Masters Using Wall Repeaters to form a Continuously Active
Network
The RC165 Ethernet GPS receiver is capable of providing time updates to
multiple master clocks located on the same subnet. Master clocks located on
different subnets should use a local or public NTP time server to obtain time
updates. The RC100 master clock is fully capable of obtaining time updates using
NTP. Set the master clocks on different channels.
Inexpensive wall repeaters are available to provide a continuously active
wireless network. This allows wireless relays, tone generators and GPS
receivers to be located anywhere in the facility where the active network is
available. The wall repeaters include an LED activity indicator to confirm that
the network is active. Repeaters are also useful to fill gaps in coverage when
wireless devices are spread far apart. Wall repeaters and analog clocks repeat all
radio channels.

6
DuraTime Features and Options
The DuraTime Wireless Synchronized Clock System offers flexibility and reliability for demanding time display
applications. This clock system will perform flawlessly for any size facility, or campus.
Master Clock Package Contents
1. DuraTime RC100 Master Clock
2. AC Power Adapter with plugs for North America, UK type, Europe and Australia
3. 10 feet (15M) of Cat-5 network cable
4. Quick Start Guide
5. DuraTime User Manual
Standard Features
1. 100% digital radio communications
2. Oven controlled oscillator accurate to 1 second in 20 years (2 parts per billion)
3. Simple installation. No system configuration required. Just insert batteries and hang on the wall.
4. Coverage for any size facility
5. Self-healing network
6. Multiple master clocks are supported for increased reliability
7. All master and secondary clocks throughout the system are synchronized to the U.S. Atomic Clock.
8. AES 128 bit encryption, providing secure and reliable communications
9. Uses the standard 2.4 GHz ISM (Industrial, Scientific and Medical) band for global compatibility
10. Master clock with LED display for time and configuration
11. Secondary clocks continue to maintain time in the absence of a time signal.
12. No FCC License or additional government authorization required. Approved for Government installations.
13. Spread Spectrum technology (DSSS) utilized, developed for the U.S. Government.
14. Electrical and/or network wiring is eliminated when using battery powered wall clocks.
15. Battery powered analog wall clocks will operate five years or longer between battery changes.
16. Daylight Saving rules can be changed at any time.
17. Master clock and Digital Clocks include a 20 year supper capacitor to maintain time during a power outage.
No batteries are used or needed in master clocks or LED digital secondary clocks.
18. Master clocks include an alarm relay output for one zone
19. 999 total alarm settings
20. 12 alarm zones
21. Alarm schedule activation by date range
22. Variable duration for each alarm setting
23. Select audio, tone or relay closure for alarm output
24. Over 70 audio alarm recordings included with optional wireless alarm interface
25. Enable/Disable auto switching between daylight and standard time
26. ABS 1RU enclosure for either desk top or rack mount installation.
Optional Features
1. Rubidium Atomic Clock - split second accurate for the life of the system (no computer network required)
2. Wireless Relay / Audio Player for connecting to bells or paging systems
3. Wireless GPS receiver – no wiring required between the GPS receiver and master clock
4. Wireless serial interface for special communications applications
5. Wireless repeaters to bridge coverage gaps or to provide a continuously available network
6. RC150 Mini-Master Clock ( includes two “AA” Lithium batteries)

7
General Specifications:
DuraTime Radios
Frequency 2405 to 2480 MHz
Protocol 802.15.4, Proprietary Mesh Network
Operating Mode ISM
Modulation Direct Sequence, Spread Spectrum, Digital
Data Speed 250 Kbps
Operating Voltage 2.1 to 3.3 Volts
Output Power +20 dBm
Rx Sensitivity -97 dBm
Range 3,000 + feet (900 meters)
Operating Temperature -40C to +85C
Regulatory Certification FCC-ID W7Z-ZIC2410P2, IC 8254A-ZIC24102, CE
Digital Codes Available 65,535
Antenna Type Inverted-F PCB antenna, no external access
RF Channels 16
External controls None
Rx Current 30 mA
Tx Current 200 mA
Collision Avoidance Yes
Channel Busy Detection Yes

8
RC100 Master Clock
Environment:
-32 degrees F to 120 degrees F, Humidity: 0% to 95% non-condensing
Internal Time Battery Backup:
10 year NiMH rechargeable battery – uses one millionth of a watt in standby mode
Clock Accuracy:
The RC100 incorporates an ultra-high precision oven controlled quartz oscillator (OCXO) that is
accurate to 2 parts per billion, or about one second in 20 years without NTP. NTP provides an
accuracy up to + or – 0.1 second per year using an NTP and/or GPS time source. An optional
Rubidium atomic clock is available for the rack mounted RC100 that provides split second
accuracy for the life of the system without the need for NTP or GPS time corrections.
Construction:
ABS 1RU cabinet allows the internal antenna to communicate with any number of secondary
devices. The cabinet may either sit on a shelf or mounted in a standard 19” equipment rack.
Power Requirements:
7-12 volts DC, 2 amps
AC adapter input 100-240 VAC, 0.8A, 47-63 Hz (FCC, UL, CE CB, GC)
RC60 Battery Powered Analog Clock Movement
Environment:
32 degrees F to 120 degrees F, Humidity: 0% to 95% non-condensing
Clock Accuracy:
Nominal accuracy provided is + or – one second when updated twice daily.
Construction:
ABS plastic cabinet allows the internal antenna to communicate with any number of secondary
devices.
Power Requirements:
Four LR6 (AA type) Alkaline or Lithium primary batteries

9
Planning
All DuraTime wireless devices receive and re-transmit time data to other devices. This includes
master clocks, analog clocks, digital clocks, alarm interfaces, repeaters and sensors. This method
of repeating data allows coverage of any size of facility or campus. The rule-of-thumb for the
placement of wireless devices is to locate them no further than 150 feet (45m) apart for areas
with many wall partitions, such as offices, dormitories and hospitals. For open areas such as a
manufacturing floor or warehouse, locate wireless devices no more than 330 feet (100m) apart.
If wireless devices must be located further apart or areas isolated from radio signals need to be
penetrated, then repeaters or other DuraTime wireless devices may be installed to bridge large
distances or penetrate difficult to reach areas.
Installation
Master Clock Installation
The master clock is accurate to about one second in 20 years, so NTP or GPS is not required for
time updates. For best results, centrally locate the master clock(s) in the facility.
1. Connect the network cable into the back of the master clock.
2. Plug the low voltage cable from the AC adapter into the back of the master clock.
3. Plug the AC adapter into a wall outlet.
The master clock will attempt to automatically register with the computer network using DHCP.
If a network connection is successful, it will then attempt to acquire network time from public
time servers using NTP (Network Time Protocol).
If DHCP is not available, the master clock’s network interface must be configured with fixed IP
address information. If an internal or other time server is to be used in place of public time
servers, then this too will need to be changed in the network interface. See the Ethernet
Communications section later in the manual for more information about configuring the Ethernet
interface.
When the master clock receives a time update from an external time server or the internal high
precision oscillator, an H, E or G sync indicator will appear the right side of the LED display.
An “H” indicates the time source is the internal high precision oscillator, “E” indicates NTP time
source, “G” indicates a GPS time source. When multiple time sources are used, the indicator
will identify the last time source used.
The master clock incorporates a high precision oven controlled quartz oscillator accurate to 1
second in 20 years, so the clock will maintain the time for an extended period without external
time updates.

10
An optional GPS receiver is available for the master clock. This receiver sends the time received
from the GPS satellites wirelessly to the master clock. The GPS receiver can be used in addition
to NTP time for a redundant time source.
Configuring the Time Zone Offset
If the time displayed is incorrect after the synchronization indicator appears, then time zone rules
may require reconfiguration. Mode 21-1 determines the time zone offset from universal
coordinated time (UTC).
Configuring Daylight Saving Rules
If Daylight Saving Time is not observed in your area, set Mode 24-1 = 0.
The RC100 Master Clock offers two methods of implementing automatic switching between
Standard and Daylight Saving Time, rule based and fixed day-of-the-year. The rule based
method is preferred because it provides the correct day of the year regardless of whether it’s a
leap year or not. The rule method is configured by entering numeric values that represent the
specific rule for your area. Mode 45-20 (switch to Daylight Saving Time) and Mode 45-21
(switch to Standard Time) are used to store the Daylight Saving Rule.
The format is MMRD, where MM = month (1-12), R = instance of the select day of the week (1-
5 5=last instance), D = day of the week (1-7), where 1=Monday and 7=Sunday. For example,
357 = the last Sunday in March, and 1117 = the First Sunday in November.
If the value >2000 then the right two digits represent the day of the month. The left two digits,
minus 20, equal the month. For example, March 15th = 2315, April 1st = 2401.
To configure a fixed day of the year (example, 15th of the month), then set the modes to 0, and
enter the day of the year to switch into Mode 52-1 (switch to Daylight Saving Time) and Mode
52-2 (switch to Standard Time).
For a list of Daylight Saving Time rules for your area, go to www.timeanddate.com.
Connections on the back of the master clock.

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

12
recommended to plug the wall repeater into an outlet located high on
the wall to prevent accidental damage or tampering. Dropped ceiling
repeaters are also available.
Be sure to secure the wall repeater to the electrical outlet using the
screw hole provided in the repeater housing. The repeater in the photo
is typical for the USA and Canada. Repeaters for other countries typically consist of a wall or
shelf mounted enclosure with a separate AC power adapter with the appropriate plug.
Continue the signal survey until the mini-master indicates full coverage throughout the facility.
A redundant system using multiple master clocks can be used in a multi-building campus to
provide full coverage. Once full coverage is verified, the mini-master is no longer needed.
Battery powered analog clocks can be installed anywhere in the coverage area.
Analog Clock Installation in a Periodically Active Wireless Network
The master clock transmits time updates every other second (43,200 times per day). However,
analog wall clocks only turn their radios on for ten seconds, twice per day at 02:00:40 and
04:00:40. This means that a system-wide network is only formed during the time the analog
clocks have their radios enabled.
There are two recommended methods of initializing analog clocks. For small systems, the clocks
should be brought within 150 feet of the operating master clock. Insert batteries into the clock’s
battery holder. The clock will first move the hands 12 hours to obtain a known reference point.
The clock will then receive and process the time and begin moving the hands in about four
minutes. Once the hands start moving to the correct time, the clock can be installed in the
desired location.
For large system, a mini-master clock is recommended for installer(s) to carry while installing
clocks. This device allows inserting the batteries into the clocks at the location where the clock
will be installed. Once the clock has moved the hands to 12:00, the clock no longer needs the
presence of the mini-master clock. At this point, the installer can move on to install the next
clock.
Alternatively, repeaters, digital clocks, wireless relays and other externally powered devices can
be used to form a continuously active network with full facility coverage. In this case, analog
clocks can be installed without the need to use the mini-master clock.
DuraTime RC150 Mini-Master Clock
The optional RC150 Mini-Master clock is a hand-held unit used to install battery powered clocks
when a signal from the master clock is unavailable. Because battery powered clocks only power
on briefly seven times per day, a time signal may not be available in a particular area. The
RC150 Mini-Master clock provides a constant time signal so that clocks may be installed
regardless if the wireless network is active or not.
RC140 Wall Repeater

13
The RC150 Mini-Master is a high precision synchronized master clock, incorporating a
temperature compensated quartz oscillator, multi-path radio transceiver and a 10 year battery to
maintain the internal time.
Mini-Master Clock Operation
Press the yellow On/Off button to power on the unit. The LED will flash twice per second. This
indicates the unit is in repeater only mode. It does not broadcast the time in this mode. It only
repeats broadcasts it receives.
To re-synchronize the RC150 mini-master with the RC100 master clock, bring the mini-master
unit within 150 feet of the master clock. Then momentarily press the blue Receive Only button
to place the unit into receive mode. The LED should blink every other second as it receives
broadcasts from the master clock. Press the Receive Only button again to receive and store the
time transmission into the mini-master device. The LED will flicker momentarily if the time is
successfully stored in the unit.
To start time broadcasting using the mini-master, press the red Transmit Time button. The LED
will double flash every second.
To receive and repeat all broadcasts, without transmitting time
stored in the mini-master, press the green Repeater Only button.
Press the On/Off button to turn the unit off. The unit will
automatically turn off after eight hours of operation. The unit is
powered by 2 x AA batteries.
Once the RC150 Mini-Master is placed in broadcast mode, it can be
carried along while installing battery powered clocks.
Install clocks closest to the transmitter(s) first, working away from
the master clock.
Multiple master clocks, with overlapping coverage is acceptable,
providing redundant time synchronization.
This is particularly important during installation and battery replacement. If the analog clock is
out of radio signal range, it will not move to the correct time after batteries are installed. There
are two ways to be sure a signal is present during battery installation. Either locate the clock
with 150 feet of the master clock, or turn on a hand-held mini-master clock in the immediate
vicinity of the analog clock. Then, insert the batteries into the analog clock and wait a few
minutes for the clock to receive the time signal and begin moving the hands to the correct time.
Go ahead and hang the clock on the wall. You do not have to wait for the hands to complete the
move to the correct time. Analog clocks receive and repeat all radio transmissions to propagate
the signal throughout the facility.
RC150 Mini-Master

14
To change the channel of the mini-master clock, press the On/Off button to power the unit on.
Then simultaneously press the Repeater Only and Transmit Time buttons, then release. The
indicator light will flicker momentarily and then go out. Next, press the Transmit Time button
equal to the desired channel number. Bypassing the Transmit Time button sets the channel to
zero (default). The indicator light will flash to acknowledge each button press. Next, press the
On/Off button to save the channel setting. The unit should immediately start operating in
repeater mode on the new channel. Setting the channel to 15 will cause the device to transmit
and receive on all channels. Repeaters and analog clocks always transmit and receive on all
channels.
Setting the mini-master channel to 16 will cause it to immediately start broadcasting simulated
GPS packets. The GPS packets will be off by the time zone offset and will not represent the
correct hour; although the minutes and seconds should normally be correct. Any further button
selections will cancel simulated GPS mode.
Digital Clock Installation
If the clock system is comprised entirely of digital clocks, the digital clock will receive and move
to the correct time (if it isn’t already there) as soon as power is applied. However, if the clock
network is comprised of a combination of digital and analog clocks, the complete network may
not be active until the analog clocks enable their respective radios. This occurs twice per day at
02:00 and 04:00. Digital clocks within range of the master clock or repeaters will move to the
correct time as soon as power is applied.
The Mini-Master clock can be used as a signal monitor to determine wireless coverage. First,
turn the unit on by pressing the blue On/Off button. Then, press the yellow Receive Only button.
The mini-master indicator light will blink with each time transmission from the master clock.
The master clock normally transmits every other second.
Digital clocks receive and repeat all radio transmissions to propagate the signal throughout the
facility.
The digital clocks are constructed using a sturdy aluminum frame with an anti-glare acrylic lens
and ABS back plate. Various mounting methods are available. The standard mounting method
consists of saw tooth hangers located on the back of the clock. Simply drive the appropriate
number of screws into the wall and hang the clock on the screws. Secure eyelet attachments are
also available where a more secure mount is required.
Wireless Relay / Audio Player / Tone Generator Installation
While the master clock includes alarm relay connections, the location of the alarm devices may
be some distance from the master clock. In this case, wireless alarm relays are available.
Wireless relays should be located within 150 feet of continuously active network transmissions.

15
The wireless relay / tone generator includes a configuration dip switch.
Switch position 1 sets the audio output, up=high (1 volt P-P), down=low (0.5 volt P-P).
Switch position 2 sets the device function (up=audio player w/ relay following, down=timed
relay).
Switch positions 3-6 sets the alarm zone number (binary 1-12).
Switch positions 7-10 sets the radio channel number (binary 0-15). Setting the channel to 15 will
cause the device to transmit and receive on all channels.
When switch position 2 is in the up position, the relay will activate as long as audio is playing.
When the switch is down position, the relay will use the timed values indicated in the drop down
box of the Windows alarm configuration program. In addition to the time relay values, the relay
can be configured to remain on or off indefinitely.
12 3 456 7 8910
DIP switch setting (default) for high volume, audio
player active, alarm zone 1, radio channel 0
12 3 456 7 8910
DIP switch setting for audio disabled with timed relay
active, alarm zone 1, radio channel 0
Binary value DIP switch settings – use the following tables to configure the switches for the zone
and channel numbers.
The zone number switches on a wireless relay are numbered 3-6
34 5 6
34 5 6
345 6
34 5 6
= 1
= 2
= 3
= 4
34 5 6
34 5 6
34 5 6
34 5 6
= 5
= 6
= 7
= 8
34 5 6
34 5 6
34 5 6
34 5 6
= 9
= 10
= 11
= 12
The channel switches are numbered 7-10.

16
78 9 10
78 9 10
78 9 10
78 9 10
= 0
= 1
= 2
= 3
78 9 10
78 9 10
78 9 10
78 9 10
= 4
= 5
= 6
= 7
78 9 10
78 9 10
78 9 10
78 9 10
= 8
= 9
= 10
= 11
10
10
10
10
78 9
789
78 9
78 9
= 12
= 13
= 14
= 15
The relay output of the master clock is always a timed or steady state, and does not follow any
audio play, or zones.
An internal speaker is available when the device is in audio player mode.
The Wireless Relay / Audio Player includes over 70 pre-recorded tones, chimes, buzzers and
bells. Also included are various Westminster clock chimes. These chimes can be configured as
a campus wide clock chime system. For best results, use only SanDisk brand memory cards.
The wireless alarm relay includes 10 Amp contacts. Larger loads should make use of a slaved
relay.
Wireless Relay modules receive and repeat all radio transmissions to propagate the signal
throughout the facility.
The DuraTime control program for Windows is available to configure and control alarm settings.
Setting the channel to 15 will cause the device to transmit on all channels, but reception is
disabled. Repeaters and analog clocks always transmit and receive on channels 0-14.

17
Operation
The DuraTime master clock obtains time updates from local or public time servers, and/or from
the optional GPS receiver. The time received is used to update the master clock’s internal
temperature compensated quartz oscillator. The internal clock is backed up using a 10 year
Lithium battery to prevent time disruptions due to power outages. All master clock
configuration parameters are stored in non-volatile memory and are unaffected by power
outages. Any number of master clocks may be used for improved system reliability.
The master clock transmits time updates using a 2.4 GHz Direct Sequence, Spread Spectrum
digital radio. All data transmitted is encrypted using AES-128 bit data encryption for security
and reliability. The RC100 master clock broadcasts time updates every other second (43,200
times per day).
Adjusting the time
The clock is factory synchronized with the atomic clock and normally does not require further
adjustment. If adjustment is required, then it is recommended that NTP or GPS be used to set the
time. The master clock can be manually adjusted with the Up and Down buttons. These buttons
are normally disabled. Press both buttons at the same time to enable. When the Up or Down
buttons are pressed, the minute will change and the seconds will reset to zero. To set the clock to
the exact second, use known accurate time reference. Change the master clock at exactly the top
of the minute.
Above is a dual-redundant master clock configuration with control buttons and LED displays. The primary master
clock is on top as indicated by the “P” on the display. It is actively broadcasting time packets as indicated by a “T”.
The secondary master clock as indicated by the “S” on the display is in standby mode as indicated by the absence of
a “T”. The secondary master clock will automatically begin transmitting if the primary fails to transmit time packets
or loses GPS or NTP sync. Both clocks are in sync with the atomic clock as indicated by the “H” character,
indicating the internal high precision oscillator is being used. Other valid sync indicators are “G” for GPS and “E”
for Ethernet NTP. Transmissions to wireless alarm devices will only be sent if there is a “T” displayed. The
absence of a “P” or “S” indicates the master clock is configured for single master clock operation. It will always
transmit in this configuration, regardless of the presence of other master clocks or sync reception.
When dual redundant master clocks are utilized, the secondary master clock will automatically
begin broadcasting time if the primary master clock loses GPS or NTP sync, or stop sending time
packets. When the primary master clock problem is corrected, it will resume broadcasting time
and the secondary master clock will cease sending time. Both master clocks will receive and use
time GPS or NTP time updates whether they are broadcasting time or not. A “T” on the display
indicates that it is actively broadcasting time packets. For more information about configuring
dual redundant master clocks, see Mode 32-69 in the Master Clock Configuration Menu section
of this manual. In dual-redundant master clock configurations, a “P” on the right side of the
display indicates that it’s configured as a primary master clock. An “S” indicates it’s configured
as a secondary master clock. The absence of a “P” or “S” indicates the master clock is

18
configured for single master clock operation. It will always transmit in this configuration,
regardless of the presence of other master clocks or sync reception.
By default, the LED display will cycle through several screens to display different information.
Momentarily pressing the blue TC button will display various other formats.
Six digit time
Eight digit date
This screen indicates whether the clock is a primary or secondary master clock
The screen indicates how the clock is synchronized, HP (high precision oscillator), GPS or
Network time.
This screen indicates which alarm schedule is active.
By default, the clock cycles through the above display formats. A different display format can
be selected by momentarily pressing the blue TC buttons. The following fixed display shows the

19
time and includes indicators for sync source and primary or secondary status. A “T” will display
on the primary clock that is actively transmitting.
Another available display format includes four digit time following by status indicators. A “T”
will display on the primary clock that is actively transmitting.
When a slave clock receives a time update, it immediately repeats the signal to all other clocks
within range. It also uses the time packet to update its internal clock, which is used to update the
display.
All remaining slave clocks receive and repeat the wireless data as needed, forming a multi-path
network. This multi-path network provides radio signal coverage for virtually any size facility.
Furthermore, the failure of any single clock will have no effect on the clock system as clock
communications are automatically routed around the failure.
If the distance between clocks is so great that there is a gap in the network, repeaters are
available to easily bridge the gap. Repeaters can also be used to form a wireless network that is
continuously active.
No network configuration is required to add or remove clocks from the network. To add a clock,
simply install the batteries in analog clocks, or connect power to digital clocks. The slave clocks
automatically connect to the multi-path network. An RC150 Mini-Master clock can be used
while installing clocks to be sure the time signal is continuously available.
The analog clock movement turns on the internal radio transceiver for 5 seconds at 02:00 and
04:00 in preparation for a time update. Marathon digital clocks turn on their receiver at 01:00,
02:00 and 03:00. After which, it places the radio transceiver in sleep mode. In this mode, the
transceiver is no longer operational and uses very little power to remain in sleep mode. If the
batteries are removed while the transceiver is in sleep mode and immediately inserted, the hands
will move to 12:00, but the movement will not receive a time update. This is because the
capacitors within the movement keep the transceiver powered enough to remain in sleep mode
for several minutes after the batteries have been removed. To reset the transceiver, remove the
batteries for at least five minutes. Then insert the batteries. The hands will move to 12:00 and
wait for reception. Then the hands will move to the correct time. If the radio transceiver is not
reset, it will still receive a time update and move the hands to the correct time; however, it will

20
be some time later. If a battery clock is in low power mode, removing and reinserting the
batteries, pressing the receive button, or shorting the reset pins will not enable for reception. A
mini-master will not help. In this case the clock must moved to a location in direct range of the
master clock. It may require up to a day to sync with the master. Once the clock is running and
displaying the correct time, it can be moved back to the original location.
Changing batteries in battery powered analog clocks
Batteries should be changed as soon as the clock second hand begins double stepping. If all
clocks are double stepping, then first check that the transmitter is operational. When changing
the batteries, bring the clock within direct range of the master clock or a calibrated mini-master
in transmit mode must be present. Remove all batteries, then insert new batteries. All
replacement batteries must be new and of the same type. After replacing the batteries, wait
one day for it to sync with the master and then return it to the original location.
If the clock is displaying the correct time after changing the batteries, but is double stepping the
second hand, go ahead and hang it back on the wall. Normal operation of the second hand
should start by the next day.
Pressing the REC button or shorting the reset pins on the back off the clock movement may not
cause the clock to receive a time update. Only removing all batteries and reinserting them will
completely reset the movement.
When the master clock receives a time update from a network or GPS time server, a time source
indicator (H, E or G) will appear in the right side of the LED display. E indicates the last time
update received was from a computer network time server. G indicates the last update received
was from a wireless GPS receiver. Multiple time sources may be used simultaneously. H
indicates the clock includes an ultra-high precision oscillator.
Digital clocks typically illuminate the decimal point to indicate they are in sync. Analog clocks
will step the second hand every two seconds if sync is lost for more than a day.
On 2.4 GHz devices, channels 0-15 correspond to 802.15.4 channel 11-26.
Analog Clock Power Saving Feature
The second hand motor uses 10 times the power of the hour/minute motor. Therefore, late model
RC60 movements include a feature to disable the second hand motor at times when no one is
around, such as at night and on weekends. Enabling this feature can extend the battery life many
years. Modes 37-77, 37-78 and 37-79 are used to configure this feature.