Johnson Controls tyco iSTAR Ultra, Installation And Configuration Manual, Page: 36 / 118

Other Interactions with the Power System
2–12 iSTAR Ultra Installation and Configuration Guide
Other Interactions with the Power System
All of iSTAR Ultras other interactions with the power system are essentially informational in
nature and do not directly affect iSTAR Ultra behavior with regard to power loss, power
saving and backup. Most of the other interactions appear in the host as configurable inputs.
This allows user to both monitor them and allow them to trigger other actions.
For example, the user could configure the AC / Main Fail and Low Battery inputs to both
trigger a configuration backup. It does not affect how iSTAR Ultra treats power loss. iSTAR
Ultra still watches for input voltage to move outside of the normal operating voltage range,
and at that time will perform a full state and configuration backup.
AC / Main Fail Input

Indicates whether the external power source has reported loss of its main power.

Shares connector and Ground pin with Low Battery.

Normally closed dry relay contacts are required. This signal is normally wired to the
energized NO output on the apS.

Configurable on host as an unsupervised input.
Low Battery Input

Indicates whether external power source, has reported its battery is low.

Wired in from external power source.

Shares connector and Ground pin with AC / Main Fail.

Normally closed dry relay contacts are required.

Configured on host as unsupervised input.