# Re-Arming the Unit

If the RTU is already DISARMED – indicated by the flashing DISARMED LED – pressing the DISARM/RE-ARM button will cause the RTU to become ARMED. This will immediately clear the alarm states of all channels. If the RTU is already ARMED, pressing the DISARM/RE-ARM button will cause the RTU to become DISARMED, and all the unacknowledged alarms will become acknowledged.

The DISARM/RE-ARM button may also be used to clear channel alarm states. If the RTU is ARMED and there are acknowledged alarms - indicated by some channel LEDs on solid (not flashing) – pressing DISARM/RE-ARM twice will cause all channel states to be cleared back to normal. If, at that time, there are no channel alarm violations, then all channel LEDs will remain off. If any channel alarm violations still exist, new unacknowledged alarms will occur after the corresponding channel alarm trip delays have expired.

Note: Since the Acknowledged Alarm state of a channel is associated with a corresponding alarm reset timer, the above operation also forces an immediate timeout, and therefore the timer will be reset.

If you are connected online to a given RTU, the online window will display the current state of the LED's on the RTU front panel, allowing you to continuously view the Armed and Disarmed state of the RTU.

If you have enabled the “Automatic Re-Arming” feature, the Catalyst will wait the configured amount of time, then automatically re-arms it. See Annunciation Options