Installation guide

2
GENERAL INFORMATION cont.
modes directly into the system. There are 20 keys on the keyboard, 19 of which have 3 letters,
characters, or numbers. This allows for 57 different selections on the keyboard, plus 5 predefined
operating modes (e.g., fully armed, part armed, etc.).
Special attention has been given to prevent unauthorized access to the panel via the keyboard. If
one or two incorrect codes or function or mode selections are entered, the message ** INVALID
ENTRY ** will be displayed each time and no action will be taken. As well, if 90 seconds
elapse after the start of the first or second incorrect attempt, the display will show CODE
ENTRY TIME-OUT. If an entry is not completed within that 90-second period, it will also be
counted as an incorrect entry and the display will show CODE ENTRY TIME-OUT. On the
third incorrect attempt, the alert message *ID SECURITY ALERT* will be displayed and a full
alarm will occur if the system is in the fully armed mode. The incorrect-entry counter is reset
after a valid code, function, or mode is entered.
CABINET
The metal cabinet is made from 18-gauge sheet steel. The door is hinged on the left and secured
at the right with two fixing screws. A terminal-strip identification label on the inside of the door
provides a quick reference for the installer or serviceperson.
MODULES
Model 1020 Dual Line Encoder Modules (D-LEMs), Model 1024 Quad Line Encoder Modules
(Q-LEMs), Model 1101 Command Line Encoder Modules (C-LEMs), and Model 1121 and 1166
Combination Line Encoder Modules (COMBO LEMs) may be placed in any order at any
position on the network. No remote power is required by the D-LEMs or Q-LEMs; however, the
APLEX 12-volt DC auxiliary power must be used to power the C-LEMs and COMBO
LEMs, and may also be used to power other devices such as PIRs. If you are using D-LEMs
and/or Q-LEMs mixed with COMBO LEMs and/or C-LEMs, we recommend two runs of
22-gauge, "telephone-style" quad wire (one quad supplying LEM data and the other quad
parallelled to supply 12-volt DC power). The network of D-LEMs, Q-LEMs, and COMBO
LEMs is scanned twice in one second to determine if any changes have occurred. This double
pass minimizes the effect of external interference from lightning, static electricity, and inductive
load switching (e.g., motors, fluorescent lamps, etc.).
When choosing a location for the LEMs, avoid any areas exposed to condensation (e.g., where
snow or rain could enter around doors, windows, eaves, or attics; steam tables in restaurants;
etc.). Condensing moisture of any amount will cause tamper or disconnect alarms to be created.
If a LEM has to be in such an environment, then it must be installed in a weatherproof
housing.