CenterClick NTP200 and NTP250 - Getting Started

Included in the Box

  • Your NTP200 or NTP250
  • A DC power supply
  • A GPS antenna
  • This getting started guide

Supply Yourself

  • An Ethernet cable
  • A Micro-B USB cable (if needed)


NTP250 Back

Connect the DC power supply, Ethernet cable, and antenna to the back.
Be sure to screw down the GPS antenna tightly.

GPS antenna placement

The included GPS antenna can be placed in any orientation, but will work best when attached to the top of a metal sheet or plate that is parallel to the ground.
The antenna module features a built-in magnet and a 6ft cord.


The NTP200/NTP250 and power supply are not watertight and should only be used in indoor dry locations or in a watertight enclosure.
The GPS Antenna is rated for wet locations and can be used indoors or outside.

Powering up

DC Power Input 7-14V DC
9V-1A or 12V-1A recommended
7-11V DC
9V-1A recommended
802.3af/at PoE - Yes
Dual Redundant Power Inputs - Yes (DC + PoE)

First power up

Power backup for rapid bootups is implemented using a supercapacitor.
Unlike a lithium cell battery, a supercap can re-charge during normal operation and will not wear out, however it will only provide backup power for about 6 hours. The supercap will charge from 0% to 90% in about 20 minutes, power the GPS module for about 5+ hours and then the RTC for an additional 12-36 hours.

On a cold boot where the supercap is discharged, it can take the GPS module 20-60 minutes to acquire lock.
During this time the GPS status can be viewed on the web interface or local console and once GPS lock is obtained the time will be stepped and correct.

Please be patient.

Connecting the Network

Both IPv4 and IPv6 are supported and, by default, DHCPv4 and DHCPv6/Autoconf6 are used to obtain network addresses automatically.
If you would like to use static addressing, this can be setup on the local USB console, see below.

Because you will need to point your NTP clients at the device, it's recommended you either set a static IP binding in your DHCP server, or configure the device with a static IP using the local USB console.

Monitoring and Configuration

Determine IP address

You'll need to determine the IP address of the device to use the Web client, SSH, and configure your NTP clients.

Unless you set a static IP using the local USB console or on your DHCP server, you will need to either lookup the IP address using the MAC address printed on the top of the device in your router or simply connect to the local USB console and press 'k' to see network status.

Web Interface

The web interface is read-only and provides monitoring status. By default, location data is displayed, however if you wish, you can turn on location data privacy for the HTTP interface using the admin console.

Local USB console

Use the Micro-B USB port for configuring the device or debugging when the network is offline.

For maximum compatibility, a serial console is presented over this USB port so you can use any terminal program and connect using 115200 baud N81 with no flow control.
Press <ENTER> on the local console for help.

Drivers for the USB controller are present in most OSs, however if you find that's not the case especially for Windows, check out Sparkfun's excellent guide at

If you need help connecting on Windows after installing the driver, check out this quick start guide to using PuTTY at

Enabling SSH console

If you want to enable remote administration, you can enable SSH logins using the Local USB console. SSH logins are disabled by default.

Configuring NTP Access Control

By default all clients can synchronize with the device, however you can use the admin console to configure IP/MASK sets that can either have additional permissions such as query access using ntpq/ntpdc or no rate limits, or less permissions such as blocking cliently entirely.

Software upgrade

Software upgrades can be performed using the admin console. Release notes can be obtained at

Front-panel button

The recessed front panel button can be used to perform functions without having to connect to the USB console.
Press and hold the button and the SYSTEM and NTP LEDs will flash rapidly to indicate the operation to perform.
Release the button after the expected number of flashes to initiate the action.

Hold forRelease afterAction
3-6 seconds 2 sets of flashes shutdown
8-11 seconds 4 sets of flashes reboot
14-17 seconds 6 sets of flashes factory reset
18+ seconds 1 set of flashes cancel, do nothing


The front panel LEDs can be in one of 4 states: off green-off, single blink green-blink, double blink green-double, or on green-on.

PPS green-off The GPS hasn't established a fix with satellites
green-blink Each off-to-on transition is the precise start of a second
NTP green-off No GPS sync
green-double Holdover or high jitter
green-on Synchronized
SYS green-off Just after powerup or shutdown/off
green-blink System booting
green-double Bad power input or no network
green-on Power and network good
PWR green-off No power
green-on Powered on
Ethernet Port green Booted and Ethernet link up
orange Rx/Tx packets

Configuring your NTP clients

Setup of your clients

You will need to point your clients to use the devices using NTP. This can be done using a DHCP option, modifying /etc/ntp.conf on linux devices, or using a GUI on Windows or MacOS


You can verify if a client is using the device by viewing the NTP Clients link on the Web Interface which will list the IP of every client that has queried the device in the past few days.

More Information and Help

See the "help" link on the built-in help webserver.

For assistance, support, or to obtain the software release notes visit