Westermo MDI-112-F4G - Manual (Page 11)

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2.3 Wiring Digital Output
The switch provides two digital outputs, also known as Relay Output. The relay
contacts are energized (open) for normal operation and will close for fault
conditions. The fault conditions include power failure, Ethernet port link break or
other pre-defined events which can be configured in management UI.
The default (without power) state of the Digital Output is normal CLOSE state.
The ON/OFF states are controlled by software configuration.
Wiring digital output is exactly the same as wiring power input introduced in
chapter 2.2.