Should there be a measureble DC voltage on IO output, when set high?
Digital output pin acts as ground when activated. To use it as a switch, you’d need to connect your positive pin to the positive of the RUT241 PSU, and negative to the DO pin. Once activated, the RUT241 will complete a circuit and allow current to flow.
This wiring diagram might help in connecting a relay to RUT241: RUT240 Relay to Open Collector Output - Teltonika Networks Wiki
Please remember, that maximum current draw on this pin can be 300 mA at 30V maximum.
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