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I have connected one reed switch as per wiki example and it works perfectly:

https://wiki.teltonika-networks.com/view/Using_RUT955_Inputs_for_security_applications

 I'm a bit confused on how to connect another reed switch to digital isolated input. I don't have another external power source to use, should I connect to the module power supply? I tried using one of the Open collector output, but it didn't seem to work.

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Hello.

I would be grateful if you explain to me in more detail what you want to connect?

https://wiki.teltonika-networks.com/view/RUT955_Input/Output#Characteristics

Perhaps this information will help you.

Kind regards, Igor/