Masterclock CLDNTD12 User manual

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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
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

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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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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.
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)

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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.
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

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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.
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.
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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9
CLDNTD12 Dimensions

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Connections
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

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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.
Default
Recommendation
(Examples)
SL26-21:4B
Bldg101-Rm121
SL29-45:8A
Conference_Room-342

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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)
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.
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

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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:
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
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:
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.

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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.
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.
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

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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.
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.
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”

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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.
USB A cable end
(to computer)
USB B cable end
(to clock)
USB port on back
(back panel view)
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.
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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18
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.
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.

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[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 re-
initialize 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.
[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”.
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.

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20
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.
The [Save] and [Save and Close] buttons must be
clicked before hitting the [Exit] button. Otherwise
any entered changes will not take effect.
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”.
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