Which object reports gateway communication health?

Module status is GO 1. The SIA heartbeat updates it. It sends 0 during normal operation and an error code when a fault applies.

Which objects report alarm power faults?

GO 163 reports AC Failure and GO 164 reports Battery Failure.

GO 233, Call scene, sends the scene number configured for an area status when that status becomes active.

GO	Name	Description
1	Module status	Sends 0 when operating normally; sends an error code when applicable. Updated by the SIA heartbeat event.
2	Firmware	Sends the firmware version of the device at startup.
233	Call scene	The scene number configured for each area status is sent to KNX whenever the area status is activated.

GO	Name	Description
163	AC Failure	Active when the main power supply of the alarm system is down.
164	Battery Failure	Active when the battery is low.

Each zone has 1 group object for status to KNX:

GO	Name	Description
67	Zone x Status	Zone status (x = 1 to 96)

The same group object structure applies to all zones.

Each area has 12 group objects: 3 for area control and 9 for area status to KNX.

GO	Name	Description
185	Area x – Arm	Arm the group
186	Area x – Partial arm	Enable/Disable Night Mode for the complete Hub
187	Area x – Disarm	Disarm the group
188	Area x – State disarmed	Area x status
189	Area x – Entry delay	Area x status (NOT USED for AJAX)
190	Area x – Exit delay	Area x status (NOT USED for AJAX)
191	Area x – State armed	Area x status
192	Area x – State partial armed	Area x status (Night Mode)
193	Area x – Fire alarm	Area x status
194	Area x – Siren ON	Area x status (NOT USED for AJAX)
195	Area x – Panic alarm	Area x status
196	Area x – Intrusion alarm	Activated when armed partition + detector alarm (BA); auto-reset on disarm

The same group object structure applies to all areas (x = 1 to 4).