Hi,

 

Im a newbie to this site.  I have an old Scantronic 9200 - well 9210 alarm and remote keypad (please dont laugh i loved the 80's),  after a lot of reseting i have managed to get it all working with the internal speaker.   I want to create a mini bell box module circuit which will flick a relay when the alarm is triggered , but to do this i need to understand the interface from the control panel and i'm clutching at straws atm - any help is appreciated ;-0

 

I have the following from the alarm control box :

 

Pin 1 - TRIG + / Hold + (constant + power supply  ??????)

Pin 2 - TRIG - /  -VE RINGING

Pin 3 - 0v  / Hold - (constant - power supply ????)

Pin 4 - TR /  -VE Tamper return.

 

Im assuming that i can user P1 and P3 as a power supply (regardless of the alarm being triggered or not).

 

what isnt clear is how:

 

• I put together the tamper circuit (I'm guessing P4 is involved)
• Detect if the alarm has been triggered which I'm guessing will need to involve P2 ?

 

Im probably over complicating things but any help is appreciated .

 

 

Paul.

 

 

Im a bit lost as to what you're trying to do, are you just trying to connect a modern external siren?

Pin 4 is just looking for 0v through a tamper switch etc... to show all is ok.

1 and 3 are just constant power as you say, 2 goes Neg in an alarm situation

Hope this helps!

Hi,  Thanks for the reply and your help.   Yes I want to use a relay so I can connect in a strobe and possibly switch on / off some other things....

 

Pin 2 - so this will be 0v when the alarm is triggered ?   does that mean it will be positive (12v) when the alarm hasn't been triggered ?

 

 

Paul.

Pin 1 is 12v

Pin 2 will switch to 0v when alarm triggers

So relay between them Will switch , you need a diode on that relay I think

Providing what you said above is correct

Don't you have a multimeter , otherwise buy one and yesterday it , very cheap these days and always useful

Thanks ,  Yes i have a multimeter and thanks to your responses i kind of know what to check,   its been a while since ive done any electronics work so apologies for all of the questions ;-)     

 

so is pin 2 an open circuit initially and then when the alarm triggers it switches to 0v ?  

Sorry just re-read your last reply about pin1 and pin 2 - many thanks !   

It really depends on the system. Modern scanys describe the bell o/p as being able to sink up to 500mA.

Prob o/c when bell off.

As above , what do they call it floating perhaps?

Could well be - the 9200 is well old mind as I'm sure you know.

You have one in the boat?