Masterclock NTD200 User manual

Masterclock NTD200 Series User Manual –v1 –January 2014
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Masterclock NTD200 Series User Manual –v1 –January 2014
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Table of Contents
Introduction ......................................................................... 3
Features ............................................................................... 4
Power, Accessories & Software .......................................... 5
Configuration Checklist ....................................................... 6
Configuration ....................................................................... 8
WinDiscovery - Installation and Configuration ................ 11
NTP Addressing Modes ..................................................... 16
Telnet.................................................................................. 18
Specifications...................................................................... 19
Trouble Shooting ............................................................... 21
Care and Cleaning .............................................................. 26
Limited Warranty .............................................................. 29
Service Information............................................................ 30
Health and Safety ............................................................... 31
Compliance ........................................................................ 32
Contact Information........................................................... 35
Thank you for your purchase of a NTD200
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, 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
The NTD200 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 NTD200 digital clocks 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 NTD200 Series User Manual –v1 –January 2014
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Introduction
NTD/NTDS
(NETWORK TIME DISPLAY/
NETWORK TIME DISPLAY SLIMLINE)
DIGITAL CLOCKS
Masterclock NTD/NTDS 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 NTD/NTDS clocks including:
NTD200
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. 24) for additional
details on each model. For available options
visit Masterclock’s website:
www.masterclock.com.

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Features
Your new NTD200 digital 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
Complete flexibility in Daylight Savings
Time configurations
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 one year after
power loss
Six-digit LED display: six-digit time or date display
12- or 24-hour display formats
Five year warranty from date of sale
Just one of our many network time
display clocks, the NTD200 features six
.6” (1.5cm) LED digits in a sturdy
attractive rust-resistant steel case.

Masterclock NTD200 Series User Manual –v1 –January 2014
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Power, Accessories and Software
Due to the large variety of clocks covered in this User Manual,
the list of accessories below is for illustrative purposes. Refer
to your sales order for actual items shipped.
NTD200 digital time display (clock)
Cat 5 patch cable
CD-ROM (with WinDiscovery software application
and User Manual pdf)
Power cord
RACK MOUNT BRACKET
Attach the Cat 5 cable and/or power cord, and then secure
the clock to the equipment rack (RM4 shown below).
Cat5 patch cable CD-ROM power cord
(select power option when ordering)
Above left: Ethernet –Insert the CAT5
Ethernet patch cable (included into the
RJ45 socket to sync with NTP source.
Note: Configuration can be done using WinDiscovery (USB or Ethernet) or Telnet (Ethernet)
Above right: DC power –Insert the DC
power cord (included) into the DC IN
socket located on the back panel.
RM4

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Configuration Checklist
Our NTD200 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
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 NTD200 clock will go through an
internal check. Time from the RTC backup will be applied until
the NTD200 server signal is acquired.
STATUS LED (LIGHT EMITTING DIODE)
The LED colons on the display will follow the following
protocol after power is applied:
Default
Recommendation
(Examples)
SL26-21:4B
Bldg101-Rm121
SL29-45:8A
Conference_Room-342
LED
STATE
STATUS INDICATION
Flashing
No Reference: The NTD200 is
not able to reference NTP
On Solid
Referenced Time: The NTD200
is receiving time referenced
from a NTP server

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TIME ZONE OFFSETS
The NTD200 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.
U.S. STANDARD
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 NTD200 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.
TCXO AND RTC CIRCUIT
The NTD200 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 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 and TCXO are maintained continuously from a
rechargeable battery circuit during periods of power outage.
Minimum holdover period is one year 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.

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DEFAULT CONFIGURATION
The factory defaults may be restored by using the WinDiscovery
program, Telnet or by using the reset button at the rear of each
clock. On dual face clocks, the reset button is located on the top.
Your NTD200 clock/device ships from the factory with the
following configuration as defined below. The NTD200 firmware
interprets the incoming time as UTC.
Configuration
Masterclock NTD200 clocks maintain their configuration data in
non-volatile flash memory, even when the power is off. Our
NTD200 clocks are configured on screen using either Telnet
(Ethernet), or WinDiscovery software (Ethernet or USB).
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 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.
SETTING
CONFIGURATION
SELECTION
Disabled
Time Zone Offset
Disabled
Daylight Savings Time
Enabled
NTP Client with DHCP
Enabled
24 Hour format

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The following RFC2132 DHCP options defined configuration
items are, when available, used by the network device for
configuration purposes:
OPTION
#
COMMENTS
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.
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. NTD200 12-04: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 either on the clock’s rear cover (on
single-face clocks) or on top (on dual-face clocks).
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.
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.

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MULTICAST
The network device also supports Multicast Addressing of NTP
packets. Multicasting is useful because it conserves bandwidth.
Multicasting replicates 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 “224.0.1.1”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 NTD200 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
Most 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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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 NTD200 device.
INSTALLING WINDISCOVERY
To install the WinDiscovery 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 can
identify 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 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
and a drop-down menu appears. The top item is a [Properties]
button.
To open the “Device Settings” window, double click the
NTD/NTDS clock name. The top left item is labeled
“Configurable Options.”

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WITHIN THE DROP-DOWN WINDOW:
Click on a menu choice to open the window for that function.
[PROPERTIES] BUTTON
“MASTERCLOCK INC. NTD/NTDS CLOCKS” WINDOW
The “Masterclock Inc. NTD/NTDS Clocks” window lists the
name, model, firmware and network configuration of your
NTD/NTDS 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 NTD200 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
are Network and NTP tabs. 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 15). The NTP tab lists whether or not the
server and/or client is 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.
[SET TO DEFAULT CONFIGURATION] BUTTON
This button brings up another “Are you sure?” window. Press
the [Yes] button and you will reset your clock back to the factory
defaults. No further window will appear.
[SET RELAY SCHEDULE AND VIEW RELAY SCHEDULE]
These buttons are only used with the MCR 1000, MCR 5000 and
the CRL 1000, which have scheduling functions.
[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”.

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GLOBAL PASSWORD
The Global Password feature allows the user to enter a single
password for all NTP 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 [Nework Configuration] button and window
are detailed on page 15.
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 [Communications Control] button and window
enable or disable Telnet.
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.
T
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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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 NTP client is disabled or
when a network connection to an NTP server is not available.
SET PASSWORD
See page 12.
RESET DEVICE
See page 13.
INSTALL NEW OPTION
This window will ask you to “Paste the Option Key you received
here. Then click Install.”
LEAP SECOND DATE
This window enables the placement of a leap second when it
occurs. Enter the date and polarity ahead of time.
EMAIL CONFIGURATION
Click the [Email Configuration] button to generate email alerts
when certain conditions are met.
AUXILIARY CONTROL
This window (at left) enables the addition of an auxiliary control
source (input the source ID). You will be asked to input the
[Multicast IP Address] and [Port]. Then you will need to set the
number of seconds (if any) in a Communication Timeout.
SET TO DEFAULT CONFIGURATION
Click this button to set your clock back to the factory defaults.
The password will revert to “public”.

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NTP Addressing Modes
Setting up to receive NTP is
relatively easy to do once you
known what you want.
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.
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.

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17
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:
1. If the device is not receiving an NTP poll response or an NTP
broadcast response depending on which mode the NTD200
is in.
2. If the NTD200 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 by Telnet or 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.
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.

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Telnet
AN ALTERNATIVE WAY TO INTERFACE
A terminal-style configuration is available via Telnet.
If you are on a non-Windows operating system (like Linux), you
will have to use Telnet. WinDiscovery is configured only for the
Windows operating system.
Use any standard Telnet client application and specify the IP
address of the device as the server with which to connect. The
factory default is Telnet server port 23.
Access the Telnet configuration by clicking the [Communications
Control] button on the “Device Settings” window (at left).
The following sections provide basic descriptions of using the
Telnet interface of the network device. Please refer to the
previous WinDiscovery section (p. 14) for additional details and
important operational information regarding the special
features and modes of the network device.
TO INITIATE A TELNET SESSION
Select the [Run] command-line interface from the Start menu
and enter the command “telnet” followed by a space, and then
the IP address of the unit and click [OK].
At the login prompt, type the user name and press the [Enter] or
[Return] key. Next you will be prompted to type the password.
The factory default for both user name and password are:
“public”.
To initiate commands, type the desired command name and
press the [Enter] or [Return] key.
At left a sample window from Telnet.
Configuration via Telnet may not be convenient
for devices operating with a factory default
configuration since the IP address is not known.
Use the WinDiscovery application to establish
first-time networking configuration.
For security purposes, the Telnet interface can
be disabled. When disabled, you will no longer
be able to access the device with Telnet.
To re-enable the Telnet feature, one of the other
configuration methods must be used, or the
device must be reset to factory default.
If you are not familiar with Telnet, ask your
network administrator for assistance.
Current configuration or default answers are
displayed in brackets. Depressing the
[Enter]/[Return] key with no number or letter
will retain the current setting.
Telnet is a 40-year-old network protocol used on
the Internet or local area networks to provide a
bidirectional interactive text-oriented
communication facility using a virtual terminal
connection.

Masterclock NTD200 Series User Manual –v1 –January 2014
19
Specifications

Masterclock NTD200 Series User Manual –v1 –January 2014
20
POWER REQUIREMENTS
AC (adaptor included)
AC Input Voltage
.............. 100-240 VAC +/-10% (90-264VAC), 47-63 Hz
.................................................................... Via AC/DC
AC Input Connector ..................... IEC input connector
AC power consumption ....................................... <6W
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 and
recharging circuit requires no maintenance and retains
time for at least one year 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)
DC
DC Input Voltage
......................................................................9-28 VDC
DC Input Connector ..............2.1mm male power plug
AC power consumption ....................................... <6W
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
IPV4
SNTP /NTP version 4 –UDP, port 123 (default)
Unicast (query, default), Broadcast, Multicast modes
Telnet –TCP, port 23 (default)
Control: WinDiscovery protocol –UDP, port 6163
COMMUNICATIONS –I/O
USB…………………………………………..…..B-type connect
Ethernet (10/100mbps)............ RJ45, 10/100baseT
Length of Ethernet cable (Cat5/5e)
............................328 feet maximum (100 meters)
There are no user serviceable parts inside the
NTD200 digital time display. Please contact
Masterclock, Inc. if you require servicing or repair.