From the Mx-410A-Box Quick Installation manual, the four inputs are specified like this:
"4 inputs for connecting sensors” and
"Inputs 4 galvanically separated inputs (AC/DC, self-powered, up to 50 V)”
Can someone tell me what this means?
Hey!
Never really tried it, but I think I can confirm your toughts because sensors usually use dry contact outputs which you can detect with mentioned IO box.
But there is one question for you. Why would you connect output to the input? Or was that only to set an example.
I have two sets of dry contacts I would like to read. My idea was to put an external SPDT relay on one of the camera output pins. The common from that relay SPDT contacts would go to the only input available on the camera. My two sets of dry contacts would go to the NO and NC SPDT contacts. (Their commons go to the camera input.)
I would read one set of contacts from the camera input and then use the camera output to switch the relay to the other set of contacts so I can read it.
Seems simple enough but the now more obvious simple way is to use the multiple inputs available on the MX-410A.
About the input specifications to the MX-410A. It is not intuitive to me how one input can tolerate both a dry contact closure and an AC/DC voltage of up to 48 Volts. I am thinking some kind of opto-isolator with a pull-up resistor? Just wondering…. worried about noise on the open contacts of a dry contact input to the thing.