Help identify alarm

I would try disconnecting the internal and external sounders, triggering an alarm, and seeing what the modem tries to dial.

It looks like an old style BT Home Safe system, now called home-guard I think. Or an old DIY shed bought system. Try the B&Q or Homebase websites to see if they match anything.

On the Keypad there is some writing in red (top left corner) but I cannot make out what it says is it possible to get a better picture or could you ask her what the letters/symbols are.

You have DTMF decoder in your pocket then? If it's a DIY jobbie the chances are it'll be the previous owners mobile or neighbour... If it does call a central station it'll talk modem or DTMF not speech.

snip

disconnecting its

I can't help with the identification, but if you removed both the mains supply and the backup battery, and the external siren didn't activate, then it is faulty.

You may well find that it is easier to replace the whole system, as the wireless systems are often quickly superceded, and replacement parts unavailable...

Hope this helps :-)

That's the bit that says "I (E or C or G?)lectronics" with the vaguely circulating electrons. It wasn't any clearer in the flesh.

and there's the further complication that she's not decided whether to go for BT or cable, so the phone line's dead at present.

That puzzled me - I haven't had any dealings with wireless systems - do external sounders rely on the user changing dry cells periodically? The keypad was flashing a "Lo Battery" warning - am I right in guessing that sensors and the sounder send these messages?

I guess you're probably right - but I _hate_ throwing things away when there's even a tiny chance of mending them.

Thanks for trying.

Dial the BT number that allows you to change your "Friends and Family" numbers. Play it the DTMF tones and it will read the number back in English for confirmation.

Oh dear, sorry, wasn't thinking. I'd be plugging it into an old modem, which can do this.

There are two principle types of external bellbox fitted to "wireless" alarm systems - firstly, where the bellbox is wired back to the alarm panel (only the sensors/keypad are wireless), and secondly where the bellbox is wireless too. In both cases the bellbox contains a rechargeable battery pack, in the former case charged by the alarm panel, and in the latter case charged by a small integral solar panel.

In either case, removing *all* power from the alarm panel should result in the bellbox siren sounding, unless the unit is faulty.

On most of the systems that I have seen installed, the sensors flag up a "flat battey", usually a month or so before the sensor is likely to fail to operate. In general, if "normal" alkaline batteries are utilised, they should be changed every year. I believe that the lithium type which are available can give service for upto five years.

The looks like a Electronics Line Summit system.

Jim Rojas

Well done that man!

Gentlemen: I award you the hand of my daughter, in gratitude for your genius.

Many thanks.

Huh, what sounds the siren then - a backup, backup battery?

Yes. Most bell boxes have a small NiCad inside them. When installed, you cut a link and enable the battery. It's kept charged by a 12V wire from the panel. The siren is 'held off' by that same power (AFAIR).

If the bad guy cuts the wire to the bell box, the siren ceases to be 'held off' and sounds, powered by the NiCad.

Some of the Wickes systems had normal zinc carbon batteries in the bell boxes and no method of charging them.

When the batteries went flat after a year or so you'd have to climb up a ladder to change them.

sponix