Power Failure Alarm; Battery Low Alarm; Power-On Led Indicator; Heartbeat Led - Tyco iSTAR eX Installation And Configuration Manual

iSTAR eX Tools
1–30 iSTAR eX Installation and Configuration Guide

Power Failure Alarm

If the AC power fails on the external power supply, an AC power
failure alarm is asserted.

Battery Low Alarm

When the battery in the apS drops to 10.2VDC, a battery low alarm is
asserted. This value will be similar for all External Power supply
devices that are used with the NPS model.

Power-On LED Indicator

The power-on LED lights up whenever the board has DC power,
either from the External Power supply or battery. This LED is the
"Super Bright LED" used in the iSTAR and shines through the door
label.

Heartbeat LED

The heartbeat LED is connected to a port line of the micro controller
and indicates that the firmware is running.