Installation guide

22
1024 REV. 2.1 QUAD LEM
MODEL 1024 REV 2.1 QUAD LEM (Q-LEM)
The Model 1024 Rev 2.1 Quad Line Encoder Module (Q-LEM) features four input-loop
connections and a tamper switch that can either be active or be shunted by switch number 8 on
the DIL switch. The Q-LEM can be connected anywhere along the LEM line, and the terminal
connections are similar to those of the D-LEM. The Rev 2.1 printed circuit board features an
LMTC (LEM-line) terminal strip on the right-hand side and a more secure tamper switch. Notice
that the terminals on the right-hand strip are designated 7 through D. Do not confuse them with
the terminals designated 5 through 10 on the earlier ISS. 1 printed circuit board.
The DIL switch settings establish the address of the Q-LEM. Only switches 1 through 7 are
used. Switch number 8 controls the tamper switch. When switch number 8 is OFF, the tamper
switch is in series with zone input A (terminal 5); therefore, on a Q-LEM cover tamper alarm,
the panel will display a DISCON for zone A. The general formula for determining the zone
numbers from the address (decimal) value is the following:
Zone A = (Address Value x 2)-1
Zone B = Address Value x 2
Zone C = (Address Value x 2)+1
Zone D = (Address Value x 2)+2
The coding table on page 27 may be used to determine the switch settings.