Issue 4.5 August 2005 Nodes 5-49
Additional Information
Installing the LEM node
Typically, the Aplex/Adplex panel is replaced by a 3GS controller. The Aplex A-LEM and C-LEM modules are then
connected to the controller via the LEM node. The controller software will recognise A-LEMs as node inputs and C-
LEMs as outputs, addressing them automatically. The LEM node will recognise the following:
The LEM node is delivered in a metal enclosure, together with its 1A PSU. It should, therefore, be left in this enclosure
and not installed in the 3GS cabinet in order to avoid any PSU conflict.
The LEM node must be powered by its 1A linear power supply, and not by the 3GS switch-mode PSU. The LEM node
does not support Aplex/Adplex keypads. Powering the LEM node from the 3GS PSU can cause interference on the
LEM data line and must be avoided.
Cable distance & type supported
No more than 750 metres of standard unscreened alarm cable (capacitance <100pf/km) should be connected to a
single LEM node. If two LEM nodes are used on a 3GS system, each can support up to 750 metres. If a screened cable
is used, it is likely that less than 350m of this recommended distance is possible.
Multiple LEM nodes
No more than 2 LEM nodes should be connected to a single 3GS system. If two LEM nodes are installed on the same
3GS system, they should be powered separately by their own 1A PSUs.
A-LEMs Quad LEM SMT or Hybrid LEM
C-LEM Key Combo LEM 6x6 I/O Module
AD-LEM Combo LEM 6 Output Module
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