Maretron DSM250-01 Trigger Configuration Low Alert, Trigger Type is Data Unavailable Alert

DSM250 User’s Manual

8.3.7.2.2 Trigger Configuration

Figure 259 – Trigger Configuration – Low Alert

Re-trigger Period – When you accept an alert, it will change to the “Accepted” state, and annunciators that are sounding for that alert will stop sounding. If the condition which caused the alert remains true after the amount of time in this field, the alert will return to the “Active” state, and annunciators will begin sounding again for that alert. If a value of 0:00 is entered, then the alert will never re-trigger.

Alert Set Point – If the value of the parameter being monitored falls below the value in this field, the alert will become active.

Alert Set Delay – The parameter being monitored must fall below the Low Alert Set Point value for longer than the time in this field in order for an alert to become active. This can be used to prevent false alerts caused by parameter values that briefly have a value that would cause an alert but quickly return to the normal value range. The value is entered as minutes:seconds. If only one number is entered, it will be interpreted as seconds.

Alert Clear Point – If the alert is active and the parameter value rises above the value in this field, the alert will become inactive.

Alert Clear Delay – The parameter being monitored must rise above the Low Alert Clear Point value for longer than the time in this field in order for the alert to become inactive. The value is entered as minutes:seconds. If only one number is entered, it will be interpreted as seconds.

In this example, the set point may be described in more than one unit, so additional fields have been supplied so that the user can select the units of depth. Changing the units of the set point will also change the units of the clear point. The initial units displayed in these fields will correspond to those set in the Units Dialog (see section 5.2.7).

8.3.7.3 Trigger Type is Data Unavailable Alert

The Data Unavailable Alert can be used in conjunction with other alert types when you need to know if a particular parameter is no longer being received on the network or is flagged as “not available” by the transmitting device. For instance, you probably would want to use a Data Unavailable Alert for the Depth->Current Depth parameter, since it would be advisable to know if the depth sounder were to stop transmitting a depth reading or became unable to determine the depth due to fouling or some other reason. On the other hand, if you were to set a Data Unavailable Alert on Engine->Engine

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