Hello, ignition is detect by voltage on the yellow wire (IGN). When the truck is bind to the trailer and the position lights are ON, the ignition go to ON and the battery will charging. In this case FMB204 need to send position to the server every 2 minutes.
When the trailer is moving but the ignition is OFF (not charging, example when the trailer is on a train unbinded from truck), the unit need to send position every 60 minutes (to save battery charge).
Regards.
Jommi