[DKSF 48.2 IU] Page WATCHDOG web interface

This page of a web interface allows to set parameters of a «Watchdog».

«Watchdog» is a specific operation mode of a power supply channel when indicated addresses are permanently (with a specified periodicity) requested by ping (ICMP Echo). If there is no response, a reboot of a device, connected to a power supply socket, is made.

What is connected (memo) is a relay description, configured on the page “220V Management”.

Polling of Addresses A, B, C is a set of checkboxes that allow to set requested addresses individually.  On default: checkboxes are not checked

Polling of Address A (B,C) is a field for viewing or changing requested addresses. It is possible to indicate IP address as well as a domain name. It is possible to configure up to 3 addresses. An empty field disables requesting.  On default: address is not set

Reset Counter of a channel – this information field shows, how many times a channel was reloaded because of the "Watchdog" actions. A counter does not record the amount of manual reboots. A counter reset happens when turning off Netping power supply.

Ping Polling Period is a field for setting a period of time in which repeated pings are sent to specified IP addresses after receiving a response from them. On default: 10 s.

Ping Timeout is a field for setting a timeout before repeating ping. This value must exceed a usual time of ping response for this network with a certain surplus to avoid false triggering of the Watchdog. On default: 1000 ms.

Number of Unsuccessful Sequential Pings (of the same address), which is considered no response is a field for setting a maximum number of attempts to get a ping response. If a number of attempts is finished, the IP address is considered silent. It is advised to have a period of ping repeats bigger than a ping timeout multiplied by maximum amount of attempts. If this condition is not met, then a new cycle of requesting will be postponed until a specified number of attmepts is over. On default: 8

Reset Duration is a field for setting time for which a device that is connected to a power supply socket is cut off power for its reset and reboot. On default: 4 s.

Ping Polling Pause after Reset is a field for setting time for which ping polling is paused after turning on a power supply socket. The pause is necessary for a device to load, initialize and restore its network interface functions. Otherwise it is possible to get an endless repeating of the Watchdog triggering. On default: 15 s.

Limit Number of Sequential Resets after which polling is stopped is a field for setting a limit number of sequential resets after which the Watchdog mode will be switched to the standby mode for this channel. At the same time polling is continued but a reset of a connected device is not performed. The standby mode ends when there is a response to ping. Value 0 of this parameter disables a limit number for sequential resets. On default: 0.

Reset Polarity is a field, which allows to specify what action must be done to reboot a connected load: «Switch 220V on» or «Switch 220V off» an output socket of a power supply channel. On default: Switch 220V Off

Reset Condition Logic defines when a reboot of a device, connected to a power supply channel, will be performed:

No reply from any of Address (A, B, C) – A connected device would be reloaded even if one of addresses did not respond.

No reply from all Addresses (A, B, C) - A connected device would be reloaded, only if all indicated polling addresses did not respond.

No reply from Address A and from one of В or С - A connected device would be reloaded, if address A did not respond as well as any of addresses B or C, or both B and C.

No reply from Address А, but B or C replies – A connected device would be reloaded only if address A did not respond and any of addresses B or C did respond. I.e. if all addresses do not respond, a reboot of a connected device will not be performed.

Forced Reboot – When clicking the button a single forced reboot of a connected load is performed. Reboot time is set by a parameter «Reset duration». A parameter «Reset mode» determines if there is a need to switch 220 V on or off to reboot a connected load.

After setting all necessary changes, click the button «Apply changes», for a device to perform a command.

If any parameter is set incorrectly, it will be highlighted in red. There is a need to adjust a value of a parameter and click the button «Apply changes» again.