Ntp Platform Service Editor Qnx view (platform-NtpPlatformServiceEditorQnx)
An example of an embedded Ntp Platform Service Editor for the JACE controller is shown below. This is the default view for the NtpPlatformServiceQnx.
Ntp Platform Service Editor Qnx settings
This view provides access to some of the key settings of the NTP daemon (ntpd) of the QNX OS running on the host controller platform.
There are two main areas: Settings at top and Time Servers at bottom.
This controller component settings in the Ntp Platform Service Editor Qnx include the following properties:| Property | Value | Description |
|---|---|---|
| Enabled | true or false (default) | If true, the host will use NTP to sync its clock with time values retrieved from other servers. |
| NTP Host Modes | Server (default) | Server (default): In addition to being an NTP client, this host will act as an NTP server. This configuration allows local network devices to use the host as a source of NTP data. Local network devices will also be able to query this host for additional NTP runtime information. Server (Time Only): In addition to being an NTP client, this host will act as an NTP server. This configuration allows local network devices to use the host as a source of NTP data. Unlike "Server", local network devices will be unable to query this host for additional NTP runtime information. Client: This host will act as an NTP client only. The NTP data retrieved by this host from configured servers will not be available to local network devices. |
| Sync Local Clock to NTP | true (default) | If true, the host will start the Network Time Protocol daemon. This boolean does not directly say that NTP will be used as a time source on this platform, rather, it enables that option. Additional properties below will inform the NTP daemon how time information now available will be used. |
| Sync Time At Boot | false (default) | If true, when the JACE boots, before the stations starts or the ntpd starts, it executes
the ntpdate command. This updates the system local
time. |
| Use Local Clock as Backup | false (default) | If true, should the specified NTP server(s) become unavailable at the time of a poll, the time used is provided by the system clock. This prevents the timing of the polling algorithm in the ntpd (which is executed at specified/changing intervals) from being reset. A true value does not result in any change to the NTP daemon’s polling interval (frequency). In fact, by using the local system clock the NTP-calculated polling time would remain the same, and thus not result in more polling. |
| Generate NTP Statistics | false (default) | If true, the NtpPlatformService reports whatever information it can about its operation. To access these statistics with the station opened in Workbench, right-click the NtpPlatformServiceQnx and select . Keep in mind that the ntpd is a QNX process; thus Niagara has no control over what it reports. |
Ntp Platform Service Editor Qnx Time Servers
Each entry in the Time Servers list specifies a server to which the host’s clock synchronizes when the service is Enabled (true), and Sync Local Clock to NTP is also true.
This also applies to any Niagara Portability Controller that implements NTP.
Controls below
the list allow you to add 
and delete 
servers,
as well as reorder up 
or down 
(to establish priority order, highest at top).
| Property | Value | Description |
|---|---|---|
| Address | text | Fully qualified domain name, IP address, or host files alias for the NTP time server. |
| Peer Mode | drop-down list | Peer mode to use with the server, as either server or peer (symmetricActive). |
| Burst | true or false (default) | False by default. If true, when server is reachable, upon each poll a burst of eight packets are sent, instead of the usual one packet. Spacing between the first and second packets is about 16 seconds to allow a modem call to complete, while spacing between remaining packets is about two seconds. |
| Preferred | true or false (default) | If true, designates a server as preferred over others for synchronization. Note also that priority order (top highest, bottom lowest) is also evaluated if multiple servers are entered. |
| Min. Poll | number | Minimum poll interval for NTP messages, from 4 to 16. Units are in “log-base-two seconds,” or 2 to the power of n seconds (NTP convention), meaning from 2 to the 4th (16 seconds) to 2 to the 16th (65,536 seconds). |
| Max. Poll | number | Maximum poll interval for NTP messages, from 10 to 17. Units are in “log-base-two seconds,” or 2 to the power of n seconds (NTP convention), meaning from 2 to the 10th (1,024 seconds) to 2 to the 17th (131,072 seconds). |
Actions
Sync Now defines the fully-qualified domain name of a public NTP server or else the IP address of any accessible NTP server. Use this action only to verify that a provided NTP server is reachable and responding. You cannot use this action while NTP is enabled.