Masterclock CLDNTD12 User Manual

1

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Caution: This icon signifies a potential hazard, and gives tips on how to avoid them.

Important Information: This icon indicates to an important step that must be followed.

Technical Note: This icon describes technical terms and actions.

Helpful Hint: This icon suggests the general setup and practice.

Thank you for your purchase of a
CLDNTD12 digital clock from
MASTERCLOCK. Here you’ll find

instructions for unpacking and
installing your clock(s), including
suggestions for proper care and
configuration.

We are here to help.

You can reach us using various
contact methods (phone, email, etc.)
found at our website:

www.masterclock.com

Before calling, please attempt to find
the answer to your situation here.

You’ll find this user manual will

handle virtually all of your questions.

Disclaimer - The material in this
document is for information only and
subject to change without notice.
While reasonable efforts have been
made in the preparation of this
document to assure its accuracy,
MASTERCLOCK assumes no liability
resulting from errors or omissions in
this document, or from the use of
the information contained herein.
MASTERCLOCK reserves the right to
make changes or revisions in the
product design or the product
manual without reservation and
without obligation to notify any
person of such revisions and changes

The CLDNTD12 digital clocks contains
microprocessor control electronics designed to

operate indoors between 32˚ to 140°F (0˚ to
60˚C) with 0-90% relative humidity, non-

condensing.

The CLDNTD12 digital clocks are not water- or
moisture-proof. Treat it as you would any
other delicate electronic device and do not
expose it to water, excessive heat or physical
abuse

Table of Contents

Introduction ......................................................................... 3

Supplied (Ship Kit) Checklist ................................................ 6

Mounting ............................................................................. 7

Connections ....................................................................... 10

Configurations ................................................................... 11

USB Device Drivers ............................................................ 16

WinDiscovery - Installation ............................................... 17

Addressing Modes ............................................................. 22

Trouble Shooting ............................................................... 26

Care and Cleaning .............................................................. 28

Limited Warranty .............................................................. 30

Health and Safety ............................................................... 31

Compliance ........................................................................ 32

Service/Contact Information ............................................. 33

Icons Used In This Manual

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CLDNTD12

Introduction

NETWORK TIME DISPLAY (NTD)
DIGITAL CLOCKS

Masterclock NTD digital clocks are
designed to display accurate time
referenced from an NTP time server, or
one located on the Internet. The wide
variety of sizes (illustrated to scale at
left), are designed for a wide variety of
applications and mounts. The built-in
NTP client can set time from one or
two NTP servers.

Masterclock produces a full line
of Network Time Display clocks
including:

CLDNTD12

NTDS 16 Desktop

NTDS16, NTDS19, NTDS112 Rack
Mount

NTDS24, NTDS24, NTDS26, NTDS29
Rack and Wall Mount

NTDS44, NTDS46, NTDS84, NTDS86
NTDS4626 Wall Mount

NTDS4626-3AL, NTDS4626-12AL,
NTDS8646 Wall Mount

Many of these include dual face
models.

All may be ordered in your choice of
four LED colors (blue, amber, green,
red) and several metal case styles.

Please refer to the “Specifications”

section of this document (p. 25) for
additional details on the CLDNTD12.
For available options visit

Masterclock’s website:

www.masterclock.com.

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Features

Your new CLDNTD12 digital-analog clock features:

 RTC (Real Time Clock) back-up maintains time

during loss of power and/or loss of NTP reference

 Time Zone offsets (to one second resolution)

supports any biasing requirements

 Operates on WAN or LAN at 10/100 Mbps
 Automatically adjust for Daylight Savings

Time change

 Fully configurable network settings,

including DHCP/BOOTP support

 Primary and secondary NTP reference

with fault-tolerant switching

 Supports NTP Broadcast, Multicast and

query (Unicast) modes

 Security features include password protected

communication and the ability to disable
Telnet management access

 Status display to remotely view, adjust and

configure devices with WinDiscovery app

 Rechargeable maintenance-free battery retains

configuration settings and time for at least two
weeks after power loss

 Four-digit models: four-digit time or date display
 12- or 24-hour display formats
 Five year warranty from date of sale

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Cat5 patch cable CD-ROM

Above: DC power – Insert the DC power cord

into the 2.1mm connector located on the
back panel.

Below: Ethernet PoE – Insert the CAT5
Ethernet patch cable (included) into the RJ45
socket.

TERMINAL BLOCK

Top: Pin 1 – NO (Normally Open)

Middle: Pin 2 – COM (Common)

Bottom: Pin 3 – NC (Normally Closed)

Power, Accessories and Software

The list of accessories below is for illustrative
purposes. Refer to your sales order for actual items
shipped.

 CLDNTD12 digital-analog display (clock)
 Mounting bracket
 Cat 5 patch cable
 CD-ROM (with WinDiscovery software application

and User Manual pdf)

 Power cord –

PoE (Power over Ethernet) models require an IEEE

802.3af compliant PoE injector or switch with +48VDC
output on spare pairs of the network cable conductor
4 and 5, with corresponding 48 VDC returns on pins 7
and 8 or by sharing the data pins and their returns.
This single network cable carries both data and
power. Maximum cable distance is 328 feet (100m).

RELAY OPTION

When the CLDNTD12 digital-analog display is not
locked to a NTP reference, the dry contact relay
will actuate.

The CLDNTD12 request time from the primary NTP
time server. If no response, then it will send a request
to the secondary NTP time server. If the CLDNTD12 is
unable to communicate with either NTP time servers,
the CLDNTD12 will change its Current Reference from

“NTP” to “Internal Osc (oscillator)”. This is considered

an un-locked condition and the dry contact relay will
actuate.

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Never insert any metallic object into the clocks case, doing so increases the risk of
electrical shock, short circuiting, fire or personal injury.

Never expose your clock to rain or use it near water or in damp or wet conditions. Never
place objects containing liquids on or near this clock, as they may spill into its openings
increasing the risk of electrical shock, short circuiting, fire or personal injury.

Please refer to the “Care and Cleaning” section of this document for details on cleaning
and recommended products.

The CLDNTD12 warranty may be void as a result of the failure to respect the precautions
stated above.

WinDiscovery Configuration Utility

Power cord

Cat5 patch cable

4 Digit LED Display

Unpacking and Installation

Supplied (Ship Kit)

The list below is for illustration purposes. Refer to your sales order for actual items shipped.

 CLDNTD12 digital-analog clock/date display
 CD-ROM (WinDiscovery Configuration Utility and User Manual)
 Power cord

CLDNTD12

Powder coated steel case

Only qualified persons are authorized to carry out maintenance on this device. Read this User’s
Manual carefully and follow the correct procedure when setting up the device. Do not open your
Masterclock product or attempt to disassemble or modify it.

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Do not route power or signal cables between the case and the wall (along the exterior of the
wall), which may pinch the power or signal cable and create a hazardous condition.

Mounting

The CLDNTD12 digital time display is designed for wall mount. Power and low voltage signal wiring
should be installed according to local electrical codes, so to access the back of the clock.

Wall Mount Bracket

A wall mounting bracket is supplied which has been designed to fit on either a standard 2”x 4” or
4” x 4” conduit box. Mount the bracket on the wall/conduit box, attach the power cord and CAT5

Ethernet patch cable and secure the CLDNTD12 to the bracket using the supplied retaining screws.
See page 7 for a plan view with measurements.

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Wall Bracket Dimensions

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CLDNTD12 Dimensions

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Ethernet PoE: Connect the CAT5 Ethernet
patch cable (included) into the RJ45 socket,
located on the back panel.

DC: Insert the DC power cord into the

2.1 mm connector located on the back
panel.

USB Port: For configuration.

Relay Option: When the CLDNTD12 is

not locked to a NTP reference, the dry
contact relay will actuate.

Reset Button - Clears
current settings

Connections

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Default

Recommendation

(Examples)

SL26-21:4B

Bldg101-Rm121

SL29-45:8A

Conference_Room-342

Configuration Checklist

The CLDNTD12 digital-analog clocks get their time signals from the Ethernet. Therefore, before
installing this device, one should be prepared with the following basic configuration information
that the device will require. It may be necessary to obtain some or all of this information from a
network administrator in your organization.

STATIC NETWORKING CONFIGURATION

__ IP address and netmask designation for device

__ Primary and secondary DNS (Domain Name Server)

__ Gateway/router

__ Primary and secondary NTP time references

DYNAMIC NETWORKING CONFIGURATION

__ Confirm that a DHCP/BOOTP service is accessible on the local network

__ Determine if DHCP server will provide NTP server configuration

__ Determine if DHCP server will provide Time Zone configuration

NTP ADDRESSING MODE

__ Determine if this device (client) will query the NTP server (Unicast mode), listen for

NTP broadcast messages (Broadcast mode), or listen to NTP as part of a Multicast group.

NAMING
All NTP devices can be provided with a verbose name. The name is arbitrary and may be useful for
organizing and managing devices once installed. By default, device names are the product name
abbreviation followed by the device’s MAC address. Customers should designate their own
custom names relating to their own organizational requirements, 32 characters max.

INITIAL OPERATION / SERVER ACQUISITION

After receiving power, the CLDNTD12 digital-analog clock will go through an internal check. Time
from the RTC backup will be applied until the CLDNTD12 server signal is acquired.

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If the Time Code input is
different from UTC, do not
adjust the Time Zone and/or DST
offset. These will adjust
automatically.

European customers: Please
carefully consult the section
entitled “Device Settings” for
details on setting your

“Summertime Period.”

Daylight Savings Time (DST)
adjustments must be configured

using the daylight time option
and not with the Time Zone
offset option in order to ensure
proper year-around operation.

LED
STATE

STATUS INDICATION

Flashing

No Reference: The
CLDNTD12 is not able
to reference Time
Code

On Solid

Referenced Time: The
CLDNTD12 is receiving
time referenced from
a Time Code

STATUS LED (LIGHT EMITTING DIODE)

The LED colons on the display will follow the following
protocol after power is applied:

TIME ZONE OFFSETS

The CLDNTD12 digital time display maintains time as
UTC initially. A Time Zone offset or bias can be
provided to adjust the time for display purposes. A
bias can be set as a positive (+) or negative (-) value.
Expect a resolution of one second.

DAYLIGHT SAVING TIME

An automatic Daylight Saving Time (DST) adjustment
can be configured separately and in addition to a
Time Zone offset. DST begins on the second Sunday of
March at 2:00 AM (Local Time) and ends the first
Sunday of November at 2:00 AM (Local Time).

EU STANDARD – EUROPEAN UNION

In the European Union, daylight change times are
defined relative to the UTC time of day. Summertime
Period begins at 1:00 AM, UTC on the last Sunday of
March and ends at 1:00 AM, UTC on the last Sunday
of October.

FREEWHEELING ACCURACY

The CLDNTD12 has built-in provisions to allow it to
freewheel and maintain accuracy for extended
periods in the absence of Time Code. These features
also allow the unit to be set manually and run without
Time Code with precision.

TCXO AND RTC CIRCUIT

The CLDNTD12 contains a precision TCXO
(Temperature Compensated Crystal Oscillator) and
RTC (Real Time Clock) circuit allowing the clock to

maintain an accuracy of ± 1 minute per year to the
last known Time Code input (±165 mSec per day)
when Time Code is not present or cannot be decoded
(i.e. freewheeling mode)

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MAINTENANCE-FREE RECHARGEABLE BATTERY

The RTC and TCXO are maintained continuously from
a rechargeable battery circuit during periods of power
outage. Minimum holdover period is two weeks with
a fully-charged battery under constant drain.

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SETTING

CONFIGURATION SELECTION

Enabled

DHCP/BootP provided network configuration

Enabled

DHCP provided NTP server address entry

Enabled

Query (Unicast) NTP client

Disabled

Time Zone offset

Disabled

Automatic Daylight Savings Time adjustment

None

Telnet access

OPTION

#

COMMENTS

Time Offset

2

The value provided will be used for the Time Zone offset configuration, unless it
is defined as zero in which case it will be ignored and the network device will
rely on internal configuration. Note: this option does not provide information
appropriate for dynamic Daylight Savings Time use.

Router

3

The first IP address provided will be used for router/gateway configuration.

Domain Name Server

6

Up to two server IP addresses may be specified. Network device will treat
addresses as primary and secondary DNS servers.

Network Time Protocol Server

42

Up to two server IP addresses may be specified. Network device will treat
addresses as primary and secondary NTP servers.

Configuration

Masterclock CLDNTD12 clocks maintain their configuration data in non-volatile flash memory,
even when the power is off. The CLDNTD12 clocks are configured on screen using WinDiscovery
software.

The factory default configuration:

DHCP/BOOTP AUTO-CONFIGURATION

DHCP (Dynamic Host Configuration Protocol) is a mechanism for automating the configuration of

network devices that use TCP/IP. When DHCP is enabled, DHCP configuration acquisition will
overwrite any manual configuration items.

Factory default: DHCP enabled.

BOOTP was a precursor to DHCP. The network device can obtain configuration from a BOOTP

server when no DHCP server is present.

The following RFC2132 DHCP options defined configuration items are, when available, used by the
network device for configuration purposes:

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The factory default displaying local time is
disabled. You must enable and configure
that setting to display local time.

We suggest you use an NTP time server
with a UTC reference to configure the
offset for your Time Zone and DST.

To ensure proper year-around operation,
the automatic DST adjustments must be

configured using the “Daylight Saving
Time” option and not with the “Time

Zone” option.

European customers, please refer to the

“WinDiscovery, DST Settings” section of

this document for additional details on,
setting daylight saving time.

A network device will not function properly
if configured to use DHCP services when no
DHCP server is available on the network.

SETTING

CONFIGURATION
SELECTION

Disabled

Time Zone Offset

Disabled

Daylight Savings Time

Enabled

NTP Client with DHCP

Enabled

24 Hour format

Device Name/Default Password

DEVICE NAME/DHCP NAME REGISTRATION

As mentioned earlier, all network devices should be

provided with a custom name (e.g. “reception-north-
wall”). By default, device names are the product

name abbreviation followed by the last octet of the
device’s MAC (Media Access Control) address (e.g.
CLD12-04:F7).

If a DHCP server is networked when the NTP device is
installed, the unit will be auto-registered with the
DHCP server. The network system administrator can
then view this DHCP name registration and the
currently assigned IP address, at the DHCP server.

DEFAULT PASSWORD

The factory-default password for the network device
is: public. Please use lower case.

RESET FACTORY DEFAULT CONFIGURATION

In some situations (such as a lost password) it may be
necessary to return your device to its factory default
configuration. A [RESET] button is located on the
clock’s rear cover.

To reset the configuration to factory default:

Press and hold the reset button for 10 seconds (until

dashes appear on the digits) and then release. The
configuration will now be reset, including the
password. The unit will need to be reconfigured to
your custom settings.

DEFAULT CONFIGURATION

The factory defaults may be restored by using the
WinDiscovery program or by using the reset button
at the rear of the CLDNTD12 digital-analog clock.

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Your CLDNTD12 clock/device ships from the factory
with the following configuration as defined on pg 13.
The CLDNTD12 firmware interprets the incoming time
as UTC.

15

IGMP
Use of the multicast addressing method
requires the use of routers and switches and
other network devices which support the
Internet Group Management Protocol (IGMP).

In addition, the IGMP mode must be enabled
and configured for multicast addressing to be
implemented properly. Please ensure that
your network system components are capable
of, and configured properly for, IGMP before
utilizing the multicast addressing feature.

Consult you network administrator for
assistance in utilizing the multicast addressing
feature.

FIREWALLS
Check with your firewall vendor to determine
how to enable multicast traffic through a
firewall. In addition, you may want to read

RFC 2588: IP Multicast and Firewalls.

Port 123

Some NTP/SNTP servers will expect NTP
clients to operate on port 123.

If the advanced settings have been altered for
your clock and you begin experiencing
difficulty in getting your clock to synchronize
to the NTP time server, or the clock begins
acting erratically, try returning the advanced
settings to the default values: “123.”

NTP CLIENT ADVANCED SETTINGS

From the NTP Client window, the [NTP Client
Advanced Settings] button allows for the
adjustment of additional network
communication settings. Under most
operating circumstances it is not necessary
to change these settings.

The factory-default TCP/UDP port for NTP
service is: “123”

MULTICAST

The network device also supports Multicast
Addressing of NTP packets. Multicasting is useful

because it conserves bandwidth. Multicasting’s
replicate only the necessary packets and only as
needed to send them only to clients that want them.

The concept of a group, and group membership, is
crucial to multicasting. Every multicast requires a
multicast group; the sender transmits to the group
address, and only members of the group can receive
the multicast data. A group is defined by a Class D
address.

The network device does not restrict the use of the
multicast address assignment and supports the full
range of class D multicast addresses or groups from

“224.0.0.0” to “239.255.255.255”. These are defined

and governed by RFC3171, IANA IPv4 Multicast
Guidelines.

Typically, the multicast address range “224.0.1.0” to
“224.0.1.255” (Internetwork Control Block) is used for

NTP traffic. However, please refer to the RFC3171 for
your specific application and implementation.

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The IGMP (Internet Group Management Protocol)
controls group membership for individual hosts. This
protocol only operates in a LAN setting, but is
required if you wish to be able to join a multicast
group on a host. IGMP is defined in RFC 2236.

ANYCAST

The network device does not currently provide
Anycast capability.

STATIC IP

To use a static IP address, de-select the checkbox for

“Automatically obtain network configuration from
DHCP/BOOTP.” You must enter the IP address,

netmask, gateway, primary DNS and also a secondary
DNS.

Devices which have been assigned a fallback IP
address of “169.254.xxx.xxx” will be displayed in the
main WinDiscovery window with RED text, indicating
a problem with the configuration.

NTP CLIENT AUTHENTICATION SETTINGS

The CLDNTD12 series uses the MD5 Message Digest
Algorithm, which is a widely used cryptographic hash
function that produces a 128-bit hash value.

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USB A cable end

(to computer)

USB B cable end

(to clock)

USB port on back

(back panel view)

USB Device Driver

A USB type B port has been included on the rear cover of the clock to provide a means of
configuring the clock via software and to allow for firmware upgrades for either firmware
corrections or future product enhancements.

To utilize the USB port, connect a USB type A to USB type B cable from the computer to the clock.

Installing the Device Driver

First, power-on the CLDNTD12. Next, use a USB cable (not supplied) and connect to the PC.
The Windows Plug and Play manager will detect a new USB device and request device drivers. If
Windows is unable to install the USB device drivers, the system will send an alert.

Open “Device Manager” and locate “CLDNTD12” listed under “Other devices”. Right
click the device and click on “Update Driver Software”. This will need to be

performed for both USB device drivers (i.e. COM and BUS).

There are two locations for the USB Device Driver:

1. C:\ Program Files\Masterclock\WinDiscovery \Drivers\

2. CD labeled, “WinDiscovery” X:\Products\WinDiscovery\Drivers\

Note: “X” is the CD/DVD drive letter of your Windows PC.

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WinDiscovery

The WinDiscovery software application is a clock setup and
configuration program that operates in the Microsoft Windows
operating system and is supplied FREE with your CLDNTD12
device.

INSTALLING WINDISCOVERY

To install the WinDiscovery complete the following steps:

Insert the CD that shipped with your CLDNTD12 device.

1. Run the “WinDiscovery.exe” application from the CD.

2. By default, the setup utility will suggest installing files to

C:\Program Files\MASTERCLOCK\WinDiscovery. Click OKAY.

USING WINDISCOVERY

It is highly recommended that only one user opens
WinDiscovery at a time. Other methods should not be used to
manage the network devices while using this software
application.

Open WinDiscovery from the “Start Menu” or by double-clicking
the shortcut icon on the desktop.

Once you click [Discover], all devices accessible on the network
will announce their presence and the status bar will display the
count of devices found. When complete, a list of device families
and groups will be displayed in the left pane of the
WinDiscovery window.

Each device is configured with a device name from the factory.
This name includes the model name and a MAC address
extension. You should change the device name to one that can
identify the location of the device.

Click on the plus [+] sign to the left of any family or group to
open and view device types that were found.

Click on the minus [-] sign to collapse these files.

Click on any device group and it will list the devices in the right

pane with all devices of that type found. To configure another
device group, click on the device name in the left window and
the device names will then appear in the right window, ready to
be managed.

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To configure and manage a device, right click the device name
in the left panel and a drop-down menu appears. The top item is
a [Properties] button.

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To open the “Device Settings” window, double click the

CLDNTD12 clock name. The top left item is labeled

“Configurable Options.”

WITHIN THE DROP-DOWN WINDOW:

Click on a menu choice to open the window for that function.

[PROPERTIES] BUTTON

The “Properties” window lists the name, model, firmware and

network configuration of your CLDNTD12 clock. These
configurations may be changed in other windows, but not in this
one. Click [OK] to exit.

[NETWORK CONFIGURATION] BUTTON

The “Network Configuration” window (lower left) lists the

device name and offers a checkbox to “Automatically obtain
network configuration from DHCP/BOOTP” or not. If not, you

may manually fill in the IP address, Netmask, Gateway and DNS.

DEVICE SETTINGS BUTTON

The “Device Settings” window is the same one that appears with
a left double-click of the device on the “Network Discovery”
window (left above, grayed out) and is detailed on page 17.

SET PASSWORD BUTTON

The “Set Password” window permits the user to enter a unique

password for every device to change the factory default
password, “public”.

A password is one to eleven characters and is case-sensitive. For
added password strength, you should use a combination of
alphanumeric and special ASCII characters.

Fill in the old password, “public” then enter the new password
twice. Click [Change Password] to save.

When a password is set for a device, each time you click [OK],
[Apply] or [Apply and Close] for that device you will be asked for
the password. You can select the “Remember this password for
the session” box and you will not be prompted for the
password, until you restart WinDiscovery. Or you can use the
Global Password feature, (page x).

If you enter the wrong password and selected the [Remember
this password for the session] checkbox, you will receive an
error upon clicking [Save] or [Save and Close] to any
configuration changes. You can close the WinDiscovery session
to forget the wrong password(s), however this will require
entering the passwords again for each device.

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Alternately, you can remove the incorrect password entry during
a WinDiscovery session by going to the drop-down menu for the
device and selecting the [Forget memorized password] button.

19

Practical use of this feature requires the
clock to be removed from the time code
source.

When the clock has access to a valid time
code source, information obtained via time
code will immediately overwrite any
manually established time/date.

[SET TIME/DATE] BUTTON

Here you may break the link to UTC time to create a custom
time. Click this button to reveal a preliminary warning. Read the
warning and continue if you wish to create a custom time for
your CLDNTD12 clock by unclicking the [UTC] button. By clicking
the [UTC] button you will return to UTC time.

[STATUS] BUTTON

The “Status” window includes a “Display snapshot” of the
clock’s face. On the right are constantly updated listings of the

UTC Time, Local Time, Current Reference, Reference Status, Last
Time Lock Lost (UTC) and Last Time Lock Restored (UTC). Below
is a NTP tab. The first lists the name and model number of the
unit followed by the network configuration numbers. These
would echo the “Network Configuration” window figures (page

13). The tab lists whether or not the server and/or client are
enabled and various stats about each.

[RESET DEVICE] BUTTON

This button brings up the “Are you sure?” window. Press the

[Yes] button and you will “soft reset” your clock to allow the
device to clear its current communications buffer and re­initialize its processing, which includes re-requesting of a DHCP
address. This feature is intended to allow the user to remotely
reset the unit and does not restore the factory default state.

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[FORGET MEMORIZED PASSWORD] BUTTON

Click this (if present) and the memorized password will be
forgotten. There is no window associated with this button. The
password reverts to the factory default password: “public”.

20

The Global Password being used must
match the password on all the devices
being administered. On any new system
being installed, the factory default

password on all devices is “public”.

GLOBAL PASSWORD

The Global Password feature allows the user to enter a single
password for all devices using the same password. During this
session and subsequent sessions of WinDiscovery, you will not
have to enter the password.

1. Check [Enable Global Password].

2. Type your password.

3. Click [OK]

To disable the Global Password, de-select the [Enable Global

Password] checkbox and click [OK].

[DEVICE SETTINGS] BUTTON

The “Device Settings” window includes three
sections. In “Configurable options” the [Input

Control] button takes you to a [NTP button].
Clicking it permits the user to enable or disable the
NTP client. If enabled, you can choose Query,
Broadcast or Multicast services to receive Time
Code.

The [NTP] button and window are detailed on page

13.

The [Display Properties] button and window (at
left) permits the user to change the brightness of
the LEDs, to change the Time/Date presentation
order, to choose 12 or 24-hour time formats with
leading zeroes on or off and to choose UTC or local
time (once local time offsets have been input).

The “Local Time Settings” section includes two
buttons for [Daylight Savings Time] and [Time
Zone/Time Offset] to offset your displayed time
from UTC to Local time.

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The [Save] and [Save and Close] buttons must be
clicked before hitting the [Exit] button. Otherwise
any entered changes will not take effect.

21

ADMINISTRATIVE FUNCTIONS

From the “Device Settings” window, click [Administrative
Functions].

SET TIME AND DATE

This feature may be most useful for demonstration, in lab
situations, environments where an external reference time
signal is not available, when the built-in Time Code client is
disabled or when a network connection to an Time Code server
is not available.

SET PASSWORD

See page 18.

RESET DEVICE

See page 19 under Properties Button.

INSTALL NEW OPTION

Paste the Option Key you receive here.

LEAP SECOND DATE

Manually enter the date of the next leap second. The leap
second insertion/deletion always occurs at 11:59:59 p.m. UTC
time on the date selected.

SET TO DEFAULT CONFIGURATION

Click this button to set your clock back to the factory defaults.
The password will revert to “public”.

EXIT

Returns to Device Settings.

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22

Setting up to receive NTP is
relatively easy to do once you

known what you want.

UDP (User Datagram Protocol) Broadcasts
Some firewalls and routers will not forward
UDP broadcasts by default. Security
configurations may need to be adjusted to
allow the UDP broadcast packets to pass
on the configured port.

NTP Addressing Modes

UNICAST (QUERY)

NTPS clocks and devices support the
Unicast Method of NTP (Network
Time Protocol) packets transfer. The

unicast method involves direct
transfer of requested information
from the NTP server to the NTP
client (clock or other device) based
on an automatically generated
electronic query or NTP time
request. The Unicast method is
supported simultaneously when
either the Broadcast or Multicast
modes are selected.

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23

Special Error Indicator
In addition to the standard status
indications, the network clock will
display a special error indicator under
the status window if either a DHCP
server cannot be located, or if the
device has an IP address conflict due to
either DHCP or Static IP addressing.
Under these conditions the unit will
also be assigned a fallback IP address of

“169.254.xxx.xxx”, and appear in RED

text under the main “WinDiscovery”

window. To determine the cause of
why the clock received a

“169.254.xxx.xxx” address the user

should display the status of the clock.
Near the bottom of the “Status”
window the error will be displayed.

BROADCAST

NTPS clocks and devices also support the broadcasting of NTP
packets. The broadcast mode is a widespread or open-ended
broadcast, not intended for any specific IP address. Broadcast
packets are useful in situations where network administrators
may wish to avoid heavy network traffic created by periodic NTP
requests. Often such periodic requests end up synchronized,
which can exceed the time server’s ability to reply promptly.

The network device listens for NTP using the
UDP (User Datagram Protocol) broadcasts using
the broadcast address “255.255.255.255”.

“SOFT” RESTARTS

A soft restart may periodically be performed by the network
device to automatically attempt to rectify a problem it may be
experiencing.

The network device will perform a soft restart under the
following conditions:

Masterclock www.masterclock.com

1. If the device is not receiving an NTP poll response or an NTP

broadcast response depending on which mode the
CLDNTD12 is in.

2. If the CLDNTD12 device is set to use DHCP and no DHCP

server can be found.

The timeout before doing a soft restart is not less than ten
minutes.

Note: Several factors can increase the time between these soft
restarts.

1. The soft restart will be delayed by two hours if a connection

is made WinDiscovery.

2. The soft restart could be delayed if the user changes the

default parameters for NTP poll retries/timeouts or the NTP
broadcast times out. For example, if the NTP broadcast
timeout is increased to 60 minutes the soft restart timeout
will also be increased to 60 minutes.

24

US/Canada Standard, Post 2006

European Union Standard

Time Zone Offset

Modify the time zone by clicking the [Time Zone] button. This opens a new window that gives
you a list of time zones, including descriptions to help with the selection. Select the desired
time zone and click [OK] to close the window. Changes are applied when you click [OK].

Daylight Saving Time

Configure and/or enable the daylight saving function by clicking the [Daylight Saving Time]
button. North American and European Union DST settings are quickly entered by clicking the
appropriate button; [US Standard] or [EU Standard].

Daylight saving time configurations will be applied when you click [OK].

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25

Physical Size
Width

Height
Depth

Weight

Material
Case

Lens

4 Digit Display

CLDNTD12

12” (30.48 cm)
12” (30.48)

2.080” (5.28cm)

4.23 lb (1.92 kg)

Powder Coated
Steel
Acrylic

COMMUNICATIONS – PROTOCOL

DHCP (enabled by default) configuration, or
via Static IP mode entry.

 Network configuration: IP address,

Netmask

 Gateway (router – DHCP option 03)
 Primary and secondary DNS – DHCP

option 06)

 Primary and secondary NTP servers –

DHCP option 042 )

 Time Zone offset (DHCP option 02) – Not

enabled by default

IPV6

SNTP /NTP version 4 – UDP, port 123
(default)

Unicast (query, default), Broadcast,
Multicast modes

Control: WinDiscovery protocol – UDP, port
6163

COMMUNICATIONS – I/O

Ethernet (10mbps) .............. RJ45, 10baseT

Length of Ethernet cable (Cat5/5e)

.............. 328 feet maximum (100 meters)

Relay (dry contact) ...... 24V AC/DC, 250Ma

…….Size and Weight

There are no user serviceable parts inside the
CLDNTD12 digital-analog time display. Please
contact Masterclock, Inc. if you require servicing or

3V,17 mAh, coin cell
Rechargeable manganese lithium
Panasonic ML1220/V1A

Communications I/O and Power Specifications

POWER REQUIREMENTS

PoE option

Power over Ethernet input voltage

.............................................. +48VDC per IEEE802.3af

Mode A: ..................... +48VDC on spare pins 4 and 5,

return on pins 7 and 8

Mode B: .................+48VDC and data on pins 1 and 2,

return on pins 3 and 6

PoE input connector ........................................... RJ45

PoE power consumption..................... < 15 W, class 0

Protection ..... . Provided by the IEEE802.3af standard

Length of network cable (Cat5/6) ................. 328 feet

(100m) maximum

DC option

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DC Input Voltage

................................. International 115/230, 50-60 Hz

DC Input Connector ......................................... 2.1mm

DC power consumption ...................................... 15 W

Protection ........... Built in fuse, output power limiting,

over voltage and short circuit protection.

Internal Battery Circuit ­Maintenance Free Rechargeable Battery

A rechargeable manganese lithium coin cell battery
(Panasonic ML1220) and recharging circuit requires no
maintenance and retains all configuration settings for
two weeks (minimum holdover) without applied
external power.

Operating/Storage Temperature and Humidity

Operating temperature….….32˚ to 140°F (0˚ to 60˚C)

Relative Humidity…………....0 to 90%, non-condensing

Storage Temperature…..…-40° to 185°F (-40° to 85°C)

26

Troubleshooting

WinDiscovery uses bi-directional UDP messaging on port 6163 for both the discovery process and
to communicate configuration and status packets to and from the NTP network device(s). Delivery
of UDP messages/packets is not guaranteed. If you experience intermittent problems with
WinDiscovery, close the current session and restart the application. If this does not resolve the
issue try the following troubleshooting tips, or switch to an alternate method of configuration.

Lost password

Possible reasons and solutions:

A password cannot be recovered if it is lost or forgotten. Reset the device to the factory default
configuration using the procedure described in the section, “Default Password” (page 14). Then
the unit can be reconfigured and provided with a new password. The default password will once
again be “public”.

Unable to find/discover the device on the network using WinDiscovery

Possible reasons and solutions:

1. The discovery process was not complete before selecting your device(s). After clicking

[Discover] wait until the status indicates 100% completion.

2. Verify that all network cables, hubs, etc. are in proper working order. Be sure that Ethernet

cross-over cables are not being used where inappropriate.

3. Verify that the network device is on the same physical network as the computer from

which you are running WinDiscovery. If the computer is separated from the device by a
router or a firewall it is likely that the router/firewall is blocking communication with the
device. Run WinDiscovery from a computer within the remote network, or ask a network
system administrator to configure the router/firewall in question to pass through (both
directions) UDP broadcasts on port 6163. If this does not resolve the detection problems
you may additionally configure to pass through both directions UDP broadcasts on ports
6165, 6166, and 6264.

4. Verify that the hub/router/switch is capable of supporting the 10mb speed that the

attached network device requires.

5. Verify that a DHCP/BOOTP server is present on the network. If the device has been

configured to use DHCP for network configuration but no DHCP/BOOTP server is present,
the device may not respond to discovery requests for up to twenty seconds after power­on. DHCP configuration is enabled as a factory-default. In addition, the device will reset its
fallback address to one within the link-local address space “169.254.xxx.xxx” when no
DHCP server is present or is not able to be reached. Reset the device to initiate a new
DHCP IP address request, or use static IP address mode. Consult your network system
administrator to ensure that a DHCP server is present and accessible on your network
and/or to obtain a list/range of available IP addresses.

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27

Clock does not respond to configuration changes and/or status display is intermittent

Device was found using WinDiscovery, but the status display is intermittent or not updating
and/or the clock does not appear to be responding to configuration changes under the current
WinDiscovery session.

Clock(s) previously found during a recent session of WinDiscovery do not show up during the
current session.

The clock status or settings displayed under WinDiscovery show garbled characters.

Possible reasons and solutions:

1. The WinDiscovery application has been open for too long and the clock configuration(s)

have changed. For example, this can occur if the DHCP server has issued a new/ refreshed
address. Close the WinDiscovery application and restart.

2. The discovery process was not complete before selecting began. After clicking [Discover]

wait until the discovery status indicates 100% completion.

3. Verify that the physical network cables and equipment are configured for UDP.

4. Verify that you are currently the only user accessing the device via WinDiscovery.

5. The network may currently be experiencing heavy traffic which is reducing bandwidth

and/or causing collisions with the UDP packets between the device(s) and WinDiscovery.
Since delivery of UDP messages are not guaranteed, this can cause WinDiscovery to not
receive the latest configuration or status packets and thus show outdated or garbled
information.

6. In some cases, the device may not be discovered and displayed in the WinDiscovery device

tree. In others, previously discovered devices may no longer be accessible or responding.
Click [Discover] again and wait until the discovery process to complete. Close the current
WinDiscovery session and restart the WinDiscovery application. Take steps to increase the
bandwidth and reduce network traffic.

If these continue to be ongoing problems, remove the device to an isolated LAN.

Clock periodically resets itself

Clock appears in red text under
WinDiscovery device tree

Clock is being assigned an IP address of 169.254.xxx.xxx

Clock is showing an “Error” field under the status window in WinDiscovery

Possible reasons and solutions:

1. Incorrect network configuration may be causing the device to receive a fallback IP address

and or perform soft restarts. Verify that the IP address configured for the device is correct.
If you manually enter (or DHCP assigns) an IP address that already exists on the network,
this will create an IP address conflict. The device will reset its address (fallback) to one
within the link-local address space. Determine the cause of fallback IP address and resolve
issue. View the error status field under the status window to help determine the cause of

why the device received a “169.254.xxx.xxx”. Near the bottom of the status window the

error will be displayed. (If there is no error the text box will not be displayed.)

2. If static IP addressing is being used the original conflicting static IP address can be

restored. Perform a soft restart of the network device using WinDiscovery prior to
changing any other configuration parameters.

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28

If the configuration of the network device is changed while a “169.254.xxx.xxx” is being used (for

example: changing the Time Zone offset), then the current “169.254.xxx.xxx” address will become
the permanent static address and the original conflicting static address will be lost.

At this point, it is necessary to manually change the static IP address to one that does not conflict, or
you may do a [Reset Configuration] to restore the system to factory default settings.

3. If DHCP was selected and the network device falls back to a “169.254.xxx.xxx” address

approximately every 10 minutes (depending upon the “Advanced Settings” values) the

Ethernet interface will be reinitialized and the network device will attempt to get an IP
address from the DHCP server. If the network device is successful, the error will be cleared
and the new address from the DHCP server will be used. If a discovery was done using
WinDiscovery was used this initialization will be delayed by two hours.

Status LED is flashing

Status in WinDiscovery says ‘”Unsynchronized”

Clock is unable to find NTP reference, either primary or secondary

Possible reasons and solutions:

4. Verify that the NTP server(s) specified are reachable, communicating, and are not flagging

their reported time as invalid. Use a PC-based SNTP client application to verify the
server(s) if necessary.

5. Verify that a gateway/router/firewall has been configured that allows the device to

communicate outside of its local network.

6. Verify that the IP address configured for the device is correct. If you manually enter or

DHCP assigns an IP address that already exists on the network, this will create an IP
address conflict. The device will reset its address to one within the link-local address space

“169.254.xxx.xxx”. If you see that the IP address starts with “169.254”, obtain a new IP

address for the device or resolve the duplication. Consult your network administrator for a
range of available IP addresses to avoid IP address conflicts.

7. If using DHCP mode, consult your network administrator to ensure that your DHCP server

is configured to automatically supply the NTP server address before selecting the “Use NTP
server(s) address provided by DHCP server” checkbox. If the DHCP server cannot
automatically supply the NTP server address(s), then deselect this option and enter the
NTP server(s) address(s) manually.

8. Verify that the device is connected to the Ethernet LAN.

9. Verify that all network cables, hubs, etc. are in proper working order. Be sure that Ethernet

crossover “patch cables” are not being used where inappropriate.

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29

Clock is not displaying
the correct local time or date

Possible reasons and solutions:

1. Clock did not properly negotiate the DST to standard time (or vice-versa) transition

2. Time Zone offset has been configured incorrectly. Provide the correct Time Zone

configuration.

3. DST has been configured incorrectly. This is configured separately from the Time Zone

configuration. Provide the correct DST configuration by either manually entering the DST
rules or selecting the single button configuration under WinDiscovery. If using the
convenient single-button configuration for [US/Canada] or [EU DST], be certain to use the
latest version of WinDiscovery and apply it for each device. If using the [Current Windows
Setting] button to apply the DST rules, verify that the rules on the computer are correct.

4. If using DHCP/BOOTP for network configuration, consult with your network administrator

to see if the optional Time Zone option has been changed as this option as provided by
DHCP can override manual settings.

5. If you have used the Set Time/Date function, note that the device assumes that you have

entered UTC and will apply your Time Zone and DST configuration relative to the manually
entered time.

6. The NTP time server(s) is not available or the NTP server being used has the incorrect UTC

time. Verify the NTP time server(s) are available and is providing the correct UTC time.

“Bad Password” Windows pop-up each time a configuration setting is applied

Possible reasons and solutions:

1. You have entered and “remembered” an incorrect password in the password windows.

This is now causing multiple error indication windows titled “Bad Password” to pop-up for

each portion of the configuration message that is being sent to the device. You must clear
the memorized password using one of the two options below.

a. WinDiscovery only remembers the password for the current session, close the

WinDiscovery session and reopen. All passwords will be forgotten by
WinDiscovery.

b. As an alternative to closing the WinDiscovery session, from the drop-down

menu on the device being administered, click on “Forget memorized
password”.

2. If using the Global Password feature, the global password does not match the existing

password of the device you are trying to manage. Either change the device password to
match that of the global password, or change the global password to match that of the
device(s) you are attempting to manage.

IF THESE INSTRUCTIONS ARE CONFUSING OR
NOT WORKING FOR YOU

Send us an e-mail or call right away. See last page (p. 35).

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30

Care and Cleaning

Adherence to regular and proper cleaning procedures is recommended to preserve appearance.
Scratched or otherwise damaged lens caused by misuse, mishandling and improper storage or
improper cleaning is not covered under the limited warranty.

Job Site Precautions

It is recommended the clock be removed from the wall and stored face up in its protective
shipment bag during painting and construction.

New construction and renovations frequently require that the job site be cleaned of any excess
mortar, paint, sealant, primers or other construction compounds. Only recommended cleaners
should be used to clean the polycarbonate lens. Contact with harsh solvents such as methyl ethyl
ketone (MEK) or muriatic acid can result in surface degradation and possible crazing of the
polycarbonate.

When the clock is first installed, glazing compound and masking tape adhesive can be easily
removed from the lens by applying naphtha (VMandP) or kerosene with a soft cloth, followed
immediately with a thorough soap and water cleaning.

Stainless Steel Case

If your clock has a stainless steel case, a cleaner and polish designed for use on stainless steel is
recommended. Use a recommended product to maintain and protect the stainless steel finish
while resisting water spots and fingerprints.

Compatible Cleaners and Polish

The following cleaning and polish agent has been found to be compatible with the
stainless steel case finish. Manufacturer's instructions should be followed.
Magic® Complete™ Stainless Steel Cleaner and Polish Spray (Magic American Products.

Washing to Minimize Scratching

Wash with a mild soap or detergent (such as 409™ (Clorox Co.), cleaner) and lukewarm water,

using a clean sponge or a soft lint free cloth. DO NOT USE PAPER TOWELS OR PAPER PRODUCTS
TO CLEAN OR DRY THE LENS. Rinse well with clean water. Dry thoroughly with a chamois or moist
cellulose sponge to prevent water spots. Do not scrub or use brushes or abrasives on these
products; the UV coating is not mar resistant. Also do not use butyl cellosolve in direct sunlight.

Fresh paint splashes, grease and smeared glazing compounds can be removed easily before drying
by rubbing lightly with a good grade of naphtha or isopropyl alcohol. Follow the alcohol rub with a
mild detergent wash with warm water and end with a thorough rinsing with clean water using a
clean damp lint free cloth.

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31

Minimize Hairline Scratches

Always store the clock face-up in the protective plastic shipping bag until ready for installation and
during transporting to the installation site. Do not place the clock face (lens surface) down on any
surface as this may scratch or mar the lens.

Scratches and minor abrasions can be minimized by using a mild automobile polish. Three such
products that tend to polish and fill scratches are:

1. Johnson Paste Wax (Johnson and Johnson Co.)

2. Novus Plastic Polish #1 and #2 (Novus, Inc.)

3. Mirror Glaze plastic polish (MG M10)

(Mirror Bright Polish Co.)

It is suggested that a test be made on a very small section of the polycarbonate lens with the
polish selected and that the manufacturer's instructions be followed.

"Don't" - Very Important

 Don't store the clock without the protective plastic shipment bag.
 Don't store or place the clock face down on any surface, as this may scratch the lens.
 Don't use abrasive or highly alkaline cleaners.
 Don't use paper towels, paper products, rayon or polyester cloths to clean or dry the lens.
 Don't scrape the lens with squeegees, razor blades or other sharp instruments.
 Don't ever use benzene, gasoline, acetone, methyl ethyl ketone (MEK), muriatic acid or

carbon tetrachloride on the lens.

 Don't clean lenses in hot sun or on very hot days.

Cleaning the Lens

The following cleaning agents have been found to be compatible with the Polycarbonate and
Acrylic lens. Manufacturer's instructions should be followed.

 Formula 409™ (Clorox Co.)
 Top Job™ (Proctor and Gamble)
 VM and P grade Naphtha Joy™ (Proctor and Gamble)
 Windex w/Ammonia D™ (Drackett Products)

 Palmolive Liquid™ (Colgate Palmolive)

Foreign Substance Removal

 Butyl Cellosolve (For removal of paints, marking pens, lipstick, etc.)
 The use of adhesive tape or lint removal tools work well for lifting off old weathered

paints.

 To remove labels, stickers, etc., the use of kerosene, naphtha or petroleum spirits is

generally effective. When the solvent will not penetrate sticker material, apply heat (hair
dryer) to soften the adhesive and promote removal. Gasoline should never be used.

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32

Limited Warranty

This MASTERCLOCK product warranty extends to the original purchaser.

MASTERCLOCK warrants this product against defects in materials and workmanship for a period of
five years from date of sale. If MASTERCLOCK receives notice of such defects during the warranty
period, MASTERCLOCK will, at its option, either repair or replace products that prove to be
defective.

Should MASTERCLOCK be unable to repair or replace the product within a reasonable amount of
time, the customer's alternate remedy shall be a refund of the purchase price upon return of the
product to MASTERCLOCK. This warranty gives the customer specific legal rights. Other rights,
which vary from state to state or province to province, may be available.

Exclusions

The above warranty shall not apply to defects resulting from improper or inadequate installation
or maintenance by the customer, customer-supplied software or interfacing, unauthorized
modification or misuse, operation outside of the environmental specifications for the product or
improper site preparation and maintenance (if applicable).

Limitations

MASTERCLOCK makes no other warranty, either expressed or implied, with respect to this
product. MASTERCLOCK specifically disclaims the implied warranties of merchantability of fitness
for a particular purpose.

In any state or province which does not allow the foregoing disclaimer, any implied warranty of
merchantability or fitness for a particular purpose imposed by law in those states or provinces is
limited to the one-year duration of the written warranty.

Exclusive Remedies

The remedies provided herein are the customer’s sole and exclusive remedies. In no event shall
MASTERCLOCK be liable for any direct, indirect, special, incidental or consequential damages,
whether based on contract, tort or any other legal theory.

In any state or province that does not allow the foregoing exclusion or limitation of incidental or
consequential damages, the customer may have other remedies.

General Use Precautions

Do not expose this clock to temperatures outside the range of 0° C to 50° C (32° F to 122° F).
Placing your device in an environment that is too cold or humid may damage the unit. Do not
place heavy objects on top of this clock or use excessive force on it. Never use benzene, paint
thinners, detergent or other chemical products to clean the outside of this clock. Such products
will disfigure and discolor the casing.

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33

Never insert any metallic object into
the devices case. Doing so increases
the risk of electrical shock, short
circuiting, fire or personal injury.

Never expose this device to rain, or use
it near water or in damp or wet
conditions.

Never place objects containing liquids
on or near this device, as they may spill
into its openings increasing the risk of
electrical shock, short circuiting, fire or
personal injury

Health and Safety

These devices generate, use and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions, may cause harmful interference to radio communications.
There is no guarantee that interference will not occur in a particular installation. If this device
does cause harmful interference to radio or television reception, which can be determined by
removing power from the device, the user is encouraged to try to correct the interference by one
or more of the following measures:

1. Connect the devices DC power cord into an outlet

on a different circuit than other devices.

2. Increase the physical distance between the

CLDNTD12 digital time display and other devices.

3. Contact MASTERCLOCK.

This CLDNTD12 has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference in a residential installation.

Only qualified persons are authorized to carry out

maintenance on this device. Read this User’s Manual

carefully, and follow the correct procedure when
setting up the device. Do not open your Masterclock
product or attempt to disassemble or modify it.

COPYRIGHT

©All rights reserved. No part of this publication may be reproduced, stored in a retrieval system,
or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or
otherwise, without the prior written consent of Masterclock.

TRADEMARKS

Microsoft is a registered trademark of Microsoft Corporation. Other trademarks mentioned in this
manual are the property of their respective owners.

PRINTING

While optimized for onscreen viewing, the pages of this manual are formatted for printing on 8.5”
x 11” and A4 sized paper, giving you the option to print the entire manual or just a specific page or

section.

Masterclock www.masterclock.com

34

Electromagnetic Compatibility 2004/108/EC
Tested and Conforms to EMC standards
Low voltage directive 2006/95/EC
Tested and Conforms to Safety standards

This device complies with Part 15 of the FCC Rules and found to comply with
the limits for a Class B digital device. These limits are designed to provide
reasonable protection against harmful interference in a commercial/residential
installation.

Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation

Waste Electrical and Electronic Equipment Directive (WEEE) 2002/95/EC

The CLDNTD12 is considered WEEE Category 9 (Monitoring and Control
Instruments Equipment) as defined by the WEEE Directive and therefore fall
within the scope of the WEEE Directive.

For more information about Masterclock’s WEEE compliance and recycle

program, please visit: http://www.masterclock.com/rohs_compliance.php

Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference
that may cause undesired operation.

Compliant

by
Exemption

Restriction of the Use of Certain Hazardous Substances Directive 2002/95/EC

The RoHS directive covers the same scope of electrical and electronic
equipment that are under the WEEE directive, except that Category 8, Medical
Devices, and Category 9, Monitoring and Control Instruments, which are under
WEEE, are excluded from the RoHS directive.

The CLDNTD12 falls under the category of Monitoring and Control Instruments
Equipment (Category 9 as defined in Annex 1A of WEEE 2002/96/EC Directive)
which is excluded from the RoHS directive 2002/95/EC (reference Article 2,
paragraph 1) requirements.

These products are manufactured using lead in the soldering process as
allowed for items excluded from the RoHS directive. These units are RoHS
Compliant only in that they are excluded from the RoHS directive under
Category 9, Monitoring and Control Instruments.

Compliance

FCC Statement

WEEE

RoHS

Masterclock www.masterclock.com

35

USA OFFICE

Masterclock, Inc.,

2484 West Clay Street
Saint Charles, MO 63301

USA and Canada: Tel [phone] | [phone] | Fax [phone]

International: Tel [phone] | Fax [phone]

Email Contacts

General Enquiries:

[e-mail]

Sales Enquiries:

[e-mail]

Technical Support:

[e-mail]

Website: www.masterclock.com

Follow us:

All content Copyright © MASTERCLOCK
1999-2013. All rights reserved.

Service Information

We sincerely hope that you never experience a problem with any Masterclock product. If you do
need service, contact Masterclock. Many problems are easily resolved with a single phone call or
email.

Visit our website for FAQs and contact information.

http://www.MASTERCLOCK.com/faq.php

Please supply us with as many details about the problem as you can. The information you provide
will be supplied to the repair department before your unit arrives. This helps us to provide you
with the best service, in the fastest manner.

We apologize for any inconvenience that the need for repair may cause you. We hope that our
rapid service meets your needs. If you have any suggestions to help us improve our service, please
give us a call. We appreciate your ideas and will respond to them.

Contact Information

Masterclock www.masterclock.com

36

Masterclock www.masterclock.com