Enabled

If true, the host will use NTP to sync its clock with time values retrieved from other servers.

Sync Local Clock to NTP

If true, this enables the host to adjust its local clock by means of NTP. If disabled (false), the local clock free-runs at its intrinsic time and frequency offset. This flag is useful in case the local clock is controlled by some other device or protocol and NTP is used only to provide synchronization (as server) to other clients. In this case, the local clock driver can be used to provide this function and also certain time variables for error estimates and leap-indicators.

Sync Time At Boot

Default is false. 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

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, andthus not result in more polling.

Generate NTP Statistics

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 Views->SpyRemote. Keep in mind that the ntpd is a QNX process; thus NiagaraAX has no control over what it reports.

Address

Fully qualified domain name, IP address, or host files alias for the NTP time server.

Peer Mode

Peer mode to use with the server, as either server or peer (symmetricActive).

Burst

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 2 seconds.

Preferred

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

Minimum poll interval for NTP messages, from 4 to 16. Note 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

Maximum poll interval for NTP messages, from 10 to 17. Note 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).