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LE4020/LE4020CF Installation Manual
If the panel is programmed for Contact ID format:
The LE4020/LE4020CF sends the required Contact ID dual-tone handshake to the panel.
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After receiving the handshake, the control panel transmits an alarm message in Contact ID format.
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The LE4020/LE4020CF decodes and transforms the Contact ID digits into an IP packet and sends it to
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the central station receiver over the cellular network.
The central station receiver acknowledges the alarm and sends a command to the LE4020/LE4020CF to
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generate the corresponding 1400Hz Kiss-off signal for a minimum of 800 milliseconds.
After the LE4020/LE4020CF generates a Kiss-off signal, it sends the next alarm or, if no further alarms need to
be sent, the control panel goes on-hook.
If the panel is programmed for SIA (300 baud) format:
The LE4020/LE4020CF sends the required SIA handshake to the panel.
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After receiving the handshake, the control panel transmits an alarm message in the SIA format.
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The LE4020/LE4020CF decodes and transforms the SIA events into an IP packet that it sends to the
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central station receiver over the cellular network.
The central station's receiver acknowledges the alarm and sends a command to the LE4020/LE4020CF
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to generate the corresponding 2025Hz kiss-off signal for a minimum of one second.
After the LE4020/LE4020CF generates a kiss-off signal, it sends the next alarm or, if no further alarms
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need to be sent, the control panel goes on hook.
Note: The LE4020/LE4020CF automatically adjusts the order of the handshakes based on the last format the
control panel used to transmit an event.
5.4 Inputs
The LE4020/LE4020CF has four inputs that can be used to trigger specific communications. These events trans-
mit using the Contact ID or SIA format with Inputs 1-4 reporting as [991] to [994] respectively.
Default settings are:
INPUT 1- FIRE
INPUT 2 - PANIC ALARM
Inputs can be configured as follows:
Normally Open - input activates when a short condition is detected between the terminal and COM
Normally Closed - input activates when an open condition is detected between the terminal and COM
Single End of Line - input activates when a short or open condition is detected between the terminal and
COM and restores when a 5.6Kohm resistor is detected between the terminal and COM.
Note: These inputs are programmable to communicate using either the Contact ID or SIA format.
Note: For UL/ULC installations, connections between alarm panel outputs and LE4020/LE4020CF inputs
must be run in protective metallic conduits. To reduce interference with the antenna, do not connect metal con-
duit to the knock-outs in the top of the cabinet.
5.5 Outputs
The LE4020/LE4020CF has four programmable outputs to activate in response to the associated events. Refer
to the LE4020/LE4020CF Wiring Diagram at the back of this manual.
5.5.1 Activating the Outputs
The LE4020/LE4020CF has four open collector outputs capable of a maximum of 50mA. Internal events on
the LE4020/LE4020CF can trigger the outputs to turn on an LED or activate an input on the host panel. The
default settings are as follows.
OUTPUT 1: Landline Trouble - Output is normally high and switchs to ground when the telephone line is
down.
INPUT 3 - BURGLARY
INPUT 4 - SYSTEM TROUBLE
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