An SOS is a dedicated station output that is only used with Conditional Response. The purpose of the SOS is to trigger an external light or other device when the controller is in an alarmed state, so that field personnel can be notified of an alarm without having to open the controller door. An SOS requires a dedicated station number to operate (any station number may be used). The station will turn on whenever the Conditional Response condition is in effect. The station output may be used to directly power a 24VAC signal lamp installed in a conduit hole, or used to activate a relay for other purposes.
The SOS station output will be wired directly to the external light or other 24V powered device.