Electronic Alarms and Home Security Devices - External siren continuously emits tone when connected to Simon XT

I have an ATW doberman plus siren w/ strobe.

It's connected from red (siren and flash) to HW1&2 DC out and black (common) to HW1 I/O on the Simon XT panel. The HW1 function is programed to 5 (output only when in alarm). A 4.7k ohm resistor is connected across the 2 wires as mentioned in the manual.

When I connect it to the SimonXT it instantly starts making a real low volume siren like tone. It never stops emitting this tone. It sounds like a car battery dying (very faint) rrrr-rrr-rrrr-rrr. Here's a recording of the sound: http://www.box.net/shared/hrjz92321j

It does produce the expected LOUD siren/strobe when activated (in my case, when panel is in alarm).

When I connect the siren to a standard 9V battery, it doesn't make the continuous noise.

However, once I connect to the panel, it still makes the continuous noise?

So, the low volume noise this thing puts out seems wrong. Is the problem with the panel or the siren? Just being connected it shouldn't start sounding this very abnormal low noise. I believe I have all the programming setup correctly for an external siren.

Figures, this is the last thing I have to do to complete the new system!

Often, fairly sensitive aftermarket sirens will emit a low tone from the supervision voltage that the system puts into the circuit.

Try installing a 4.7k (first 3 stripes yellow, violet, red) resistor.

Often, fairly sensitive aftermarket sirens will emit a low tone from the supervision voltage that the system puts into the circuit.

Try installing a 4.7k (first 3 stripes yellow, violet, red) resistor.

Thanks.

I do have a 4.7k resistor across the hot and common. Should I put another in line with the hot as well?

No, the one you have should have done the trick. I suspect that this is more an issue with your siren than with the alarm. The voltage drop across the resistor should more than enough to prevent that bleed through current.

No, the one you have should have done the trick. I suspect that this is more an issue with your siren than with the alarm. The voltage drop across the resistor should more than enough to prevent that bleed through current.

OK, I'll double check that the resistor is a 4.7 and that its a good connection and report. Thanks again for your help.

That was it. I had a 47k resistor (yellow,violet,orange). That orange certainly looked red depending on light.

I put a 3.3k resistor (closest to 4.7 that I had here) in parallel and that routed the supervisory current away from the siren.

Thanks!