NTP Client/Server

The Network Time Protocol (NTP) is a networking protocol used for clock synchronization in computer systems over packet-switched, variable-latency data networks.

NTP Functionality Overview

The IHC Interface runs an NTP client.
This client synchronizes the internal clock of the IHC Interface with an NTP server.
The internal clock is used for:
- audit log time stamps,
- validity checks of certificates during secure communication.

The Wiser for KNX controller can be configured as an NTP server. In this case, the IHC Interface synchronizes its time directly from the controller.

Configuring NTP Server on the Wiser for KNX Controller

The NTP server functionality is provided by the controller firmware and is configured using the controller web interface.

To configure the controller as an NTP server:

Open the controller web interface.
Navigate to Configurator > System > Services.
Select NTP client/server from the drop-down menu.
Set the Local server static option to Enabled. This makes the controller act as an NTP server.
Set the Client status option to Disabled if your controller has no access to the Internet NTP servers.
If you enable Client status, up to four NTP server addresses can be configured.
The servers must be reachable from the controller network.
Click OK to apply the changes.
Restart the controller if required.

After configuration, the controller provides time synchronization services to connected devices, including the IHC Interface.

Checking Current Wiser for KNX Controller Time

To check the current time on the controller:

Open the controller web interface.
Navigate to Configurator > Date and time.

The displayed time confirms that time synchronization is working correctly and serves as the reference for all time-dependent functions, such as automations, timers, scenes, and certificate validation.