It is a dry "relay" port. If you are to anything useful with it you need to use it to control a real relay. The links provided will probably give you he specs of the conatcts.
What are you trying to do?
Take Care
Matt
If at first you don't succeed, skydiving is not for you.
The contact on the older systems also had some bleeding issues, meaning that if you were connected to a very touchy relay it would view the contact as closed when it was acctually open. Started to use the Bogen door opener after that.
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