Electronic Alarms and Home Security Devices - problem with Ademco glass break sensor

I installed a Ademco wireless contact (5815) in my Ademco Lynx system and used the wired post (loop 1) to hardwire two Ademco ASC-SS1 glassbreak shock sensors. I wired them in series and hooked up the loop. One of the sensors will trip the alarm but not the other. I checked both sensors using a meter and when they are struck, they open the circuit, so the sensors work. Any ideas what my problem is? The loop is about 12 ft in length using 18 gauge doorbell wire. With the loop intact and a meter on the posts, the circuit opens when the glass is struck. I have very limited electrical knowledge, so please be gentle.

The wireless transmitters have very limited power to use for the external contact loop. In general, about 5-6 feet is considered the max length for even a standard switch-type contact on these. Shock sensors actually load the circuit. I'd never try to put more than one on a wireless transmitter. (even a regular hardwire input will only work with about 8-10, max)

Thanks for the info. When you say the sensors load the circuit does that mean they draw power from the wireless contact transmitter? I assume that will cause the battery life to go down. What I can't figure is that the sensor furthest away from the wireless transmitter works but the one closest to it doesn't.

The shock sensor has a higher native resistance than a plain contact.

The Honeywell/Ademco spec for these transmitters specifies that the overall loop resistance for external devices has to be below a certain amount (no, I don't have the exact number, it's on the installation sheet for the transmitter...). That amount translates into a fairly short pair of wires with 1 or two contact _switches_.

You are trying to get the bear to dance to a tune it was never designed for...

This thread is about 4 weeks old, but ... you might try the Sentrol 5150 with the Ademco 5816. The 5150 does draw any current, as opposed to the ASC-SS1 which draws a small current (<1mA). Even if you could get 2 of the ASC-SS1 to work with the 5816 I suspect your battery life would suck.