Thanks, I'll get them programmed and send them out.

 

Thanks Mark - received in the post yesterday!

 

Good news, hopefully it will all be working soon.

 

All worked! just having issues with the signal wires - my alarm outputs 0v in alarm situation, and the device takes 12v as alarm situation!

 

You should be able to do it like this:
http://www.allaboutcircuits.com/vol_4/chpt_3/1.html
10K for the base resistor, 1K for the collector resistor should be fine.
Any of these will be OK:
http://www.maplin.co.uk/low-power-lf-npn-transistors-to92-case-32952

 

Thanks mark!

Breadboarding these circuits up tonight and let you know how i get on!

 

Hi Mark,

Any chance you could draw me a diagram like you did with the LED green/red indicators?

Gave it a go, but think i've fired the transistor

The LED one works great though! thanks!

 

Here you go. There is a potential problem in that this is open collector output (with a pullup resistor), so if more than a small current is drawn from the output at high level then the output voltage drops.
Whether it's a problem depends on the input type that it is connected to. If it's a transistor or optocoupler input it should be no problem, but if it's the coil of a relay, it's going to need a rethink.
If you have a multimeter, check what voltage this circuit outputs connected and disconnected to the equipment.