Intelligent Roadway Information System


Select View ➔ Maintenance ➔ Alarms menu item

An alarm is a device which has a boolean state indicating whether or not it is triggered. The description of the alarm might indicate an equipment failure, high temperature, low voltage, etc.

An alarm can be created for controllers using a protocol that generates alarms, such as MnDOT-170.

API Resources 🕵️
  • iris/api/alarm (primary)
  • iris/api/alarm/{name}
Access Primary Secondary
👁️ View name, state trigger_time
🔧 Configure description, controller pin


The state field is set to true when triggered. When it changes, a time-stamped record is added to the alarm_event table. These records are purged automatically when older than the value of the alarm_event_purge_days system attribute.