Alarm interface circuit

[zuirgham]

I'm Designing an alarm interface circuit, which is one of the small part of a ventilator machine. This is an external alarm interfaced as a remote alarm, in case nurse is in different room. If there is some error, the alarm goes ON.

I have no idea what the general interface looks like / have inside the alarm circuit, so that i can plan my design accordingly.

I just know it should be normal connected(N.C). , interface connector Should be 8pin RJ45, Thats all. What data to send, which protocol to be used, im just blank for now.

I was thinking of using relay to Switch between Normal open and Normal closed, But no idea what data to send, etc.

I found something relevant on internet, please see the image attached.


Could Anyone guide me on this on how to proceed with designing circuit for this ?

 

[KlausST]

Hi,

on the picture, the internal schematic is shown.
What else do you need?

The picture does no show any DATA signal.
So the relay and the 51k resistor is all you need.

At least this is what we can see.

Klaus