Masterclock NTDS-A User manual

Masterclock NTDS-A User Manual –Original –2013-04-25
1

Masterclock NTDS-A User Manual –Original –2013-04-25
2
Table of Contents
Introduction ............................................................................. 3
Features ................................................................................... 4
Power, Accessories and Software ........................................... 5
Mounting ................................................................................. 6
Configuration Checklist ............................................................ 7
Configuration ......................................................................... 10
Installing Device Driver for USB Configuration ..................... 12
WinDiscovery - Installation and Configuration ..................... 13
Telnet ..................................................................................... 22
Specifications NTP ...................................................................23
Trouble Shooting NTP .............................................................24
Care and Cleaning .................................................................. 29
Limited Warranty ................................................................... 31
Service and Return Information..............................................32
Health and Safety ....................................................................33
Compliance ..............................................................................34
Mounting Diagram...................................................................37
Contact Information ................................................................38
Thank you for your purchase
of a Masterclock Digital Display.
Here you’ll find instructions for unpacking
and installing your Masterclock Display(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, Inc. assumes no liability
resulting from errors or omissions in this
document, or from the use of the
information contained herein. Masterclock,
Inc. 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
Operating Parameters
The Masterclock Display 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 Masterclock Display is 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

Masterclock NTDS-A User Manual –Original –2013-04-25
3
Introduction
THE MASTERCLOCK DIGITAL DISPLAY syncs to a NTP
(NETWORK TIME PROTOCOL) source for accurate, traceable
time.
The Display is also designed to accept several varieties of
input and to provide countdown abilities using the optional
Masterclock RC500. This is our most versatile time-keeping
device yet
The NTDS-A accepts Network Time Protocol.
For countdowns, the Masterclock Display can be controlled
with the optional RC500 up/down controller. This device is
sold separately, and is a powerful tool and can be used in
many ways to control the display choices.
The Masterclock Digital Display
features one alpha-numeric (for
future use) and numeric LED digits in
a sturdy attractive black powder-
coated steel case. Not designed for
outdoor use, this display can be
remotely configured and operated.

Masterclock NTDS-A User Manual –Original –2013-04-25
4
Features
Your new Masterclock Digital Display provides easy-to-read accurate
time based on NTP references. Based on a design for NASA, the
NDTS-A Masterclock Digital Display features countdown abilities,
including the imposition of a hold. In addition the Display features:
Real-time clock back-up, it maintains accurate time during loss
of power and/or NTP reference.
Time Zone offsets (to one second resolution), it supports any
biasing requirements.
Operates on WAN or LAN at 10/100 Mbps.
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 authenticated
communication and the ability to disable Telnet management
access.
Status display to remotely view, adjust and configure devices
with WinDiscovery program
Internal rechargeable maintenance-free battery retains
configuration settings and time for at least two weeks after
power loss.
Nine-digits: Six-digit time display plus three-digit DOY (Day of
Year) or countdown with hold
Syncs to external/internal NTP source for accurate traceable
time
Display time in 12- or 24- hr formats –hh:mm:ss
Three-digit display of “Day of Year” . (On 9-Digit or more models)
Configurable for countdown. (Using optional RC500 Controller)
Adjustable brightness
Automatic Daylight Saving Time
Standard chassis color is black powder coat
PoE (Power-over-Ethernet) or worldwide AC Power
CE marked for sale in EU –FCC, Class B, emissions (pending)
Dry contact relay option. (Must be requested at time of
purchase) –Used to activate or switch external device.

Masterclock NTDS-A User Manual –Original –2013-04-25
5
Clock Connectors, Power, Accessories and Software
The following items are Included for mounting, power,
configuration and connectivity with your Masterclock digital
display kit
Mounting brackets (two)
CD-ROM (with WinDiscovery software application
and User Manual pdf)
Power cord –Standard IEC plug
On the back of the unit the various power plugs and
signal input connectors are placed.
RESET BUTTON
In some situations (such as a lost
password) it may be necessary
to return your device to its
factory default configuration.
Press and hold the reset button
to manually reset the NTDS-A.
STANDARD IEC AC PLUG
A standard IEC power cord and input
are provided.
USB B CABLE INPUT
A USB connection is reserved for
future use.
RJ45 JACK
Input connector admits Ethernet
network data.
BNC CONNECTOR
(not seen on NTDS-A.)
CD-ROM IEC power cord
Reset button
IEC power socket for AC
Reset button
IEC power socket for AC
Above: USB B cable input
Middle: RJ45 jack for Ethernet PoE
Below: BNC connector for Time Code signal input
RJ45 Jack Adapter

Masterclock NTDS-A User Manual –Original –2013-04-25
6
Mounting
You can mount your Masterclock Display according to your
needs. Appropriate brackets should already be included in your
kit.
DESIGNED FOR WALL, RACK OR TABLE MOUNT
Your Masterclock Display is designed to fit a variety of surfaces
and environments supported by these sturdy brackets.
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 or TC cable and secure the Masterclock Display to the
bracket using the supplied retaining screws.
SWIVEL MOUNT BRACKET (OPTION)
First, mount both swivel brackets to the wall, then attach the
signal input cable(s) and power cord and finally secure the
Masterclock Display to the swivel brackets using the supplied
retaining screws. Angle up or down to provide the best viewing.
Finally, tighten all screws.
TAKE CARE DURING INSTALLATION
Power and low voltage signal wiring should be installed
according to local electrical codes and to enable access to the
back of this device.
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.

Masterclock NTDS-A User Manual –Original –2013-04-25
7
Configuration Checklist
Your Masterclock Digital Display gets time cues from the
Ethernet. Therefore, before installing this device, one
should be prepared with the following basic configuration
information that the device will require during installation
and installation of the WinDiscovery configuration app. 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 net mask designation for your Display
__ 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, including your Masterclock Display, can and
should 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.
Default
Recommendation
(Examples)
NTDS-A-21:4B
Bldg101-Rm121
NTDS-A-45:8A
Conference_Room-342

Masterclock NTDS-A User Manual –Original –2013-04-25
8
INITIAL OPERATION / SERVER ACQUISITION
After receiving power, the Masterclock Display will go
through an internal check. Time from the RTC backup will be
applied until the NTP time stamp is acquired.
STATUS LED (LIGHT EMITTING DIODE)
The LED colons between the digits on the display will follow
the protocol after power is applied (operation is
configurable via WinDiscovery or Telnet):
TIME ZONE OFFSETS
The Masterclock 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 (see page 16) in addition to the Time
Zone offset mentioned above. 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 NTDS-A has built-in provisions to allow it to freewheel
and maintain accuracy for extended periods in the absence
of NTP. These features also allow the unit to be set
manually and run without NTP with precision.
LED STATE
STATUS INDICATION
Flashing Colons
No Reference: The device is not able to reference NTP
Solid Colons
Referenced Time: The device is receiving time
referenced from a NTP server
Solid Colons
A controller (RC500 or other device) commanded
countdown is in progress
If NTP input is different from UTC, do not
adjust the Time Zone and/or DST offset.
These will adjust automatically.
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.

Masterclock NTDS-A User Manual –Original –2013-04-25
9
TCXO AND RTC CIRCUIT
The Display contains a RTC (Real Time Clock) circuit allowing
the clock to maintain an accuracy of ± minute per year to
the last known NTP input (± 165 mSec per day) when NTP
is not present or cannot be decoded (i.e. freewheeling
mode).
MAINTENANCE-FREE RECHARGEABLE BATTERY
The RTC is 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.
DEFAULT CONFIGURATION
The factory defaults may be restored by using the
WinDiscovery program, Telnet or by using the reset button
at the rear of the NTDS-A.
Your Masterclock display ships from the factory with the
following configuration as defined below. The NTDS-A
firmware interprets incoming time signals as UTC.
SETTING
CONFIGURATION SELECTION
Disabled
Time Zone Offset
Disabled
Daylight Savings Time
Enabled
NTP Client with DHCP
Enabled
24 Hour format

Masterclock NTDS-A User Manual –Original –2013-04-25
10
Configuration
The Masterclock display maintains its configuration data in
non-volatile flash memory, even when the power is off.
These data are configured on screen using either
WinDiscovery (page 12) software or Telnet (page 20).
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
Enabled
Telnet access
DHCP/BOOTP AUTO-CONFIGURATION
DHCP (Dynamic Host Configuration Protocol) is a
mechanism for automating the configuration of network
devices that uses 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 NTDS-A 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 NTDS-A 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. NTDS-A will treat addresses
as primary and secondary DNS servers.
Network Time Protocol
Server
42
Up to two server IP addresses may be specified. NTDS-A will treat addresses
as primary and secondary NTP servers.

Masterclock NTDS-A User Manual –Original –2013-04-25
11
DEVICE NAME/DHCP NAME REGISTRATION
As mentioned earlier, your Masterclock Display 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. NTDS-A-04:F7).
If a DHCP server is networked when the Masterclock Display
is installed, the unit will be auto-registered with the DHCP
server. The network system administrator can then view
this DHCP assigned IP address at the DHCP server and assign
a name registration .
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.
The factory default displaying local time
is disabled. You must enable and
configure that setting to display local
time.
We suggest you use a Masterclock
MCR5000 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 Savings
Time” option and not with the “Time
Zone” option.
European customers, please refer to the
“WinDiscovery, DST Settings” section
(page 18) for additional details on setting
“summer” time (page 8).
A network device will not function
properly if configured to use DHCP
services when no DHCP server is available
on the network.

Masterclock NTDS-A User Manual –Original –2013-04-25
12
Installing the device driver Masterclock Digital Display
USB DEVICE DRIVER
A USB type B port has been included on the rear cover of the
clock to configure the clock to allow for firmware upgrades,
corrections and enhancements.
INSTALLING THE DEVICE DRIVER
First, power-on the clock. Next, use a USB cable (not supplied)
and connect the clock to your 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 [Time Code Display] 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, “Products” X:\Products\NTDS-A\Drivers\
Note: “X” is the CD/DVD drive letter of your Windows PC.
USB A cable end
(to computer)
USB B cable end
(to clock)
USB B port on clock
(back panel view)
Device Manager
Device Manager with correct USB Device Driver

Masterclock NTDS-A User Manual –Original –2013-04-25
13
WinDiscovery
The WinDiscovery software application is a device setup
and configuration program that operates in the Microsoft
Windows operating system and is supplied FREE with your
Masterclock Digital Display device.
INSTALLING WINDISCOVERY
To install the WinDiscovery app complete the following
steps:
Insert the CD that shipped with your network device.
1. Run the “setup.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
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 identifies the location of the device.
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.
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 the group.
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.

Masterclock NTDS-A User Manual –Original –2013-04-25
14
Colored device description(s) indicate the following status
conditions:
RED: DHCP is enabled for NTP displays, but the display has
reverted to the Microsoft standard fallback ip address. In
this situation the last two octets of the ipaddress will
represent the Hex-decimal variant of the last digits of
display Mac address.
BLUE: The device is connected via the USB port on the
Windows Computer; this is common when configuring a
Timecode variant.
Green: The Display is currently assigned via DHCP and the
Static IP of 192.168.1.1 is currently assigned to the display
most likely, the Network Router is not configured for
DHCP. Display should be assigned another Static ip so as to
avoid conflicts on the LAN.
Black: The device is configured via DHCP over NTP and
communicating normally.
To configure and manage a Masterclock Display, right click
the device name and a drop-down menu appears.
To open a Masterclock Display “Device Settings”window
directly, single click the device name.
WITHIN THE DROP DOWN MENU WINDOW:
Six choices are presented. 1. Properties; 2. Network
Configuration; 3. Device Settings; 4. Set Password; 5. Set
Time/Date; 6. Status; 7. Reset Device; and 8. Forget
memorized password.
PROPERTIES
The [Properties] button produces a window that lists the
configuration figures currently used (at left)
NETWORK CONFIGURATION
If you do not want to automatically obtain network
configuration from DHCP/BOOTP, you may make your
changes here.

Masterclock NTDS-A User Manual –Original –2013-04-25
15
SET PASSWORD
The “Set Password” window enables the entry of a new
password for each individual device.
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 (i.e. ASCII
character codes 128 –255).
The password must be entered twice to confirm the entry.
Click [Change Password] to save or [Cancel] to discard the
change.
When a password is set for a device, each time you click
[Save] or [Save 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 14).
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 [Forget memorized
password].
SET TIME/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 NTP OR TIME CODE
client is disabled or when a network connection to an NTP
OR TIME CODE server is not available.
STATUS
This window is detailed on page 15.
DEVICE SETTINGS
Your Masterclock Display device settings window handles
most of the visible aspects of the device. In short order, the
Input control sets the parameters for the time reference
employed. The “Local Time Settings” configured the display
in the format you prefer, using the [Daylight Savings Time]
and the [Time Zone Offsets] buttons to completely
customize the time output relative to UTC time.

Masterclock NTDS-A User Manual –Original –2013-04-25
16
The [Status] button takes you to the
“Status” window (page 16), which
includes a Display Snapshot of the digital
time display, constantly updated. This
update is not ultra-precise, but is meant
to give you a remote view of the display
from your computer console for trouble-
shooting and maintenance purposes.
Here you can choose settings such as the
LED brightness level, format of time, etc.
TIME REFERENCE
INPUT CONTROL
Click the [Input Control] button to reveal the “Input Control”
window. Click the [NTP OR TIME CODE Client] button to reveal
the “NTP OR TIME CODE Client” window (page 15).
QUERY NTP SERVER FOR TIME (NTP
ONLY)
The NTP settings are located in the upper left-hand
section of NTP Configuration window. Note the
two settings: Primary and Secondary.
Primary: The Primary reference information must
be configured in order to acquire time from an NTP
reference.
Enter either the IP address or Internet address/URL
(Uniform Reference Locator) for the NTP reference.
Secondary: If available, enter a secondary
reference for backup.
The primary and secondary server information can
be automatically configured by the DHCP server IF
your DHCP server is configured to do so.
If so, select “Use NTP server(s) address provided
by DHCP server.” (Consult your network
administrator to use this option).
By default, the NTP clock will operate only in
Unicast/Query mode using Server Port 123.
This mode is selected exclusively when neither the
listen for NTP broadcast nor the listen for NTP
multicast modes are selected.

Masterclock NTDS-A User Manual –Original –2013-04-25
17
LISTEN FOR NTP VIA MULTICAST
The network clock can be set up to listen to NTP using
multicast addressing by selecting the “Listen for NTP via
multicast address(s)” checkbox.
When enabled, the “Multicast class D / Group address”
may be specified as well as the frequency that multicast
broadcasts will be issued. This can be changed as desired.
The network clock can listen for NTP multicast broadcasts
using the full class D/ group address range. The network
clock 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 groups (or class D address ranges for multicasting) 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.
Listen/Query Restrictions
while listening to NTP broadcasts/
multicasts, the network clock cannot be
configured to query the time server.
Some NTP/SNTP clients will expect NTP
servers to operate on port 123 and
cannot be configured to use alternate
ports.
The static IP address you enter must not
be in use by another device on the
network, this includes IP address ranges
reserved for use by the DHCP server. If a
static IP address is used which creates a
duplicate IP address condition, the
network clock will be assigned a fallback
IP address of “169.254.xxx.xxx”.
The “169.254.xxx.xxx” address is a link
local address range (i.e. not allowed on
the internet) and is used by Microsoft
when their DHCP clients cannot find a
DHCP server.

Masterclock NTDS-A User Manual –Original –2013-04-25
18
LISTEN FOR NTP VIA BROADCAST
The network clock can be configured to listen to NTP
broadcasts by selecting the “Listen for NTP via broadcast
address “255.255.255.255” checkbox.
The broadcast timeout is adjustable when this mode is
selected.
The default configuration is to query the NTP server at 10-
minute intervals. The clock drift is +/- 1 minute per year, so
you can adjust as needed. To configure the Display to only
listen to NTP broadcasts, click the checkbox for “Listen for
NTP broadcasts only” and enter a “Broadcast Timeout” in
minutes. The default timeout is 60 minutes.
DHCP
The default factory setting for network
configuration is to use DHCP/BOOTP.
The Fallback Address
If a DHCP server cannot be found on the network
by the NTP Display, the IP address will be assigned
a fallback IP address of “169.254.xxx.xxx”
STATUS
The “Status”window is a more compact version of
the “Device Settings”window. Open this by
clicking on the [Status] button. The time
adjustments are listed here. They represent
changes to the internal time reference as
compared to the NTP server. For instance:
1. During acquisition of NTP server
Initial startup
After loss of power
After loss of NTP refrence.
2. During changes to the clocks configurations
under:
Network configuration (NTP only)
Device settings (i.e. NTP configuration)
Reset device

Masterclock NTDS-A User Manual –Original –2013-04-25
19
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, net mask,
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 Masterclock Digital Display technology can take
advantage of the MD5 Message Digest Algorithm, which is a
widely used cryptographic hash function that produces a
128-bit hash value.
IPV6 ADDRESSING (PENDING)
IPV4 ADDRESSING
The Masterclock Display NTP configuration uses IPV4
communications protocol using 128-bit addresses to
communicate with other Internet devices.
NTP OR TIME CODE CLIENT ADVANCED SETTINGS
From the NTP Client window, the [Client Advanced Settings]
button allows for the adjustment of additional
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”
DISPLAY PROPERTIES
Control the brightness of the display
digits with a slider.
Choose from several other Display
Options including:
1. Type of input (Count, IRIG-B12, Auto
detect or Blank)
2. Clock mode (12- or 24-hour)
3. Count Input (takes one out of clock
mode and into count mode)
4. Whether leading zeroes are on or off
(during 24-hour time)
5. “Hold” symbol preference
6. UTC or local time display
7. NTP reference failure display settings
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.”

Masterclock NTDS-A User Manual –Original –2013-04-25
20
DAYLIGHT SAVINGS TIME SETTINGS
Click [Daylight Saving Time] to open that window. The clock
has complete flexibility to display any Time Zone and DST
combination.
For setting the DST rules, use one of the following options.
1. Manually enter the daylight saving time rules; or
2. Click [US/Canada Standard]; or
3. Click [EU Standard] (European Union) button.
4. Then Click [Current Windows Setting] to apply the
currently configured for your Windows OS.
5. Click [OK] to close the Window.
The DST rules will be saved when you click [Apply] or
[Apply and Close].
TIME ZONE SETTINGS
Click [Time Zone] to open the “Time Zone Configuration”
window. This window displays a list of Time Zones, including
descriptions to help with the selection. Select your offset
and click [OK] to close this window.
COMMUNICATIONS CONTROL
TELNET CONTROL
The [Telnet Control] button adjusts Telnet configuration. If
Telnet is allowed, the port must be the default Telnet port
of 23. See your network administrator if you need additional
information.
ADMINISTRATIVE FUNCTIONS
From the “Device Settings” window, click the
[Administrative Functions] button to view the following
choices.
SET TIME/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 NTP client is
disabled or when a connection to an NTP server is not
available.