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4.2 ALARMS
4.2 Alarms
Introduction
In addition to the status LED on the front of the logger (see section 4.3, LED Flash Patterns), LAN data
loggers have a built-in sounder and an external connection that changes state when the logger’s alarms
are active.
The external connection can be used to trigger devices such as an SMS Dialler or a purpose built
indicator (light and/or sound etc.).
The external connection can also supply power to external devices.
An active alarm can be muted by pressing the button on the front of the logger.
Note that muting the internal alarm sounder will also turn off the external connection. If required,
the connection should be held on (latched) by external equipment until it is explicitly acknowledged.
Muting the alarm at the logger does not acknowledge or switch of the alarm in Tinytag Explorer
Connect.
Cable Wiring
An output cable for the external connection is available, part number CAB-0042. This is a plug with a
1.5m cable with stripped ends, ready for wiring into a terminal block. Connection information is as
follows:
Alarm Output Connections
Power Output
The power output is regulated at 11·5V ±0.5V from the PoE supply. The output voltage will therefore
turn off if the PoE supply fails.
Example Usage
Note that if only 2 cores are used, the unused core must be insulated.
Colour Name Function
Brown Power DC power supply from the logger (see below for details)
Green Ground Power-supply reference (0V) and alarm signal return
White Signal Alarm Indication (open-drain, pulled to Ground when an alarm is
active, otherwise open-circuit). This output will continue to change
state, in the event of an alarm, should the PoE supply to the logger fail.