FrankMc said:As mentioned above , i prefer to use "Tamper Detection" you actually install 2 resistors in a sensor / door contact and this allows the alarm panel to determine if the sensor is in alarm or in tamper condition using one pair of wires for both.......
Frank
Are you referring to the "Optional Four (4) State Zone Wiring (2 series resistors w/ N.C. contacts) on page 9 of the ELK install manual?