This trap is generated when the External Measurement Unit has detected that an ambient temperature or humidity limit extreme has been exceeded, or that one of the contact closure inputs has changed from the selected `normal' state. In the case of multiple alarms, a trap is generated for every alarm condition detected. In addition, the trap is sent every two minutes whenever an alarm condition exists. It is discontinued when all alarm conditions are reset. This trap is sent only for alarm states that have been enabled.