Honeywell INTEVIO User Manual page 52

2． If the line of the contact inputs needs to be supervised, it is necessary to install 10k resistors
to each switch output of the external devices or the third-party device as shown below:
Connecting Dry Contact Output
Each dry contact output has NO, NC and COM pins, which can be used to control third-party devices
or transmit the device status.
Follow the steps below to connect dry contact outputs:
1． Control external device
When the dry contact output is used as a switch to control an external device or transmit a
device status, connect the NO, NC and COM terminals to the external device as shown below:
2． Connecting 3-wire volume controller
Loudspeaker interface A and B are in parallel. When connecting a 3-wire volume controller,
connect the loudspeaker interface from Group A to the dry contact output NO and NC pins. The
COM output acts as a switching wire (R) to connect to the 3-wire volume controller. The
corresponding 100V and 0V from Group B connecting to the 3-wire volume controller act as a
hot point (H) and cool point (C). Refer to the diagram below:
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