Accurate clock synchronization is required for Pluto to operate correctly. If Pluto’s system clock is incorrect, it may not be able to download data from connected data loggers.

By default, Pluto periodically connects to a public NTP server to synchronize its system clock. However, some organizations do not allow access to public NTP servers.

For SiteView-Web 1.4.96 or later, Pluto can instead synchronize its clock with a local computer running SiteView.

Follow the steps below to configure a local NTP server.

1. Start SiteView

On the local computer that will provide the NTP service, make sure SiteView version 4.4.9 or later is installed.

Start SiteView.

If Windows displays a firewall prompt, click Allow access to allow SiteView to communicate through the network.

2. Enable the NTP Server in SiteView

In SiteView, go to:

Others → Tools → NTP Server

In the NTP Server dialog, select:

NTP Server Enabled

Then click OK to save the setting.

Open the NTP Server dialog again and verify that the status shows:

NTP Server is running

3. Configure Pluto to Use the Local NTP Server

Open the Pluto Admin Portal and go to:

Admin → Settings

Scroll to the Custom NTP Server section and click Enable.

Enter the IP address of the computer running SiteView, then click Save.

For example:

192.168.1.75

After the setting is saved, the Enabled field should show:

Yes

This indicates that Pluto will use the specified SiteView computer for clock synchronization.

4. Verify the Connection

Return to SiteView and open the NTP Server dialog.

When Pluto requests clock synchronization, new entries should appear in the log section.

This confirms that Pluto is communicating with SiteView’s NTP server.

Important

You may close the NTP Server dialog, but SiteView must remain running for Pluto to continue using it as the NTP server.

The computer running SiteView must also remain accessible from Pluto over the network.

The local NTP server configuration is now complete.