Help With Hybrid System

[steveo14]

Hello

I have a MDT(Westech) Avanti XP alarm panel - normal sort of thing - 8 zones, remote keypad and connections to bell box. I wanted to extend the system to cover some other parts of the house and got a keystone wireless receiver and a wireless door contact to go with it. To quote the web site "for connection to any existing wired alarm system creating a hybrid wired / wirefree security system".

I thought all I would need to do is to wire the receiver into one of the zones on the panel and then if the door contact is opened it sends a signal to the receiver and the alarm goes off. However it turns out the receiver uses a negative trigger (although you can change this to positive) which is just one wire. So how do I connect it to one of the zones (the normally closed circuit) that is used by the alarm panel which uses a two wire connection? Sorry if this has come up before but I did a search and did not find anything. Thank you for any advice you can give me.

[hpotter]

You will need a relay.

Put neg output of receiver on one side of relay coil, take +ve (from aux supply) and put on other side of coil.

Connect normally closed relay contacts to alarm zone.

I would suggest a diode across coil to prevent back emf.

Im sure maplins could sort.

[steveo14]

Thank you for your advice. Hopefully I will be able to wire it in now.