Labconco Guardian 1000 Digital Airflow Monitor - Manual (Page 6)

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Output 1 --- volt free relay output configurable as normally closed or normally open relays.
Output 2 --- volt free relay output configurable as normally closed or normally open relays.
Output 3 --- volt free relay output configurable as normally closed or normally open relays.
Com Port --- to enable connection to Laptop or PC for full diagnostics , logging or setting
up and for communications to building computer system ( BMS)
Power supply --- low voltage DC power supply
Airflow Sensor --- connection socket for the face velocity airflow sensor.