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Lynx Plus Series Installation and Setup Guide

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System Communication

This section provides an explanation of formats this system accommodates for reporting alarms and other
system conditions to the central station. The process of a successful transmission consists of both the
method of communication between the control panel and the central station receiver, and the actual way the
information is sent and displayed at the central station.

Communication Overview

When the panel calls the central station receiver, it waits to hear a “handshake” frequency from the receiver
to confirm that the receiver is on-line and ready to receive its message. Once the panel hears the handshake
it is programmed to listen for, it sends its message. The panel then waits for a “kissoff” frequency from the
receiver acknowledging that the message was received and understood.
If the handshake frequency is not given or is not understood by the panel, the panel will not send its
message. Once the handshake frequency is received and understood by the panel, the panel will send its
message. If there is an error in the transmission (the receiver does not receive a “valid” message), the kissoff
frequency will not be given by the central station receiver.
The panel will make eight attempts to the primary telephone number and eight attempts to the secondary
telephone number (if programmed) to get a valid message through. If the panel is not successful after its
numerous attempts, the keypad will display “FC Comm Failure.” If the secondary number is a pager, “FC
Comm Failure” displays after the first 8 attempts to the primary number.

The following chart defines the (handshake/kissoff) frequencies that the panel supports, and the different
formats that can be sent for each.

FORMAT HANDSHAKE

TRANSMITS

DATA

KISSOFF TRANSMIT

TIME

Low Speed
3+1, 4+1, 4+2

1400Hz 1900Hz

(10PPS)

(Standard report)

1400Hz

Under 15 seconds

Sescoa/Radionics
3+1, 4+1, 4+2

2300Hz 1900Hz

(20PPS)

(Standard report)

2300Hz

Under 10 seconds

Express
4+2

1400–2300Hz

DTMF (10 cps)

1400Hz

Under 3 seconds

Contact ID®

1400–2300Hz

DTMF (10 cps)

1400Hz

Under 3 seconds

Report Code Formats

3+1 and 4+1 Standard Formats

Comprise a 3- (or 4-) digit subscriber number and a single digit report code (e.g.
alarm, trouble, restore, open, close, etc).

3+1 and 4+1 Expanded Formats

Comprise a 3- (or 4-) digit subscriber number, and a 2-digit report code. The first
digit is displayed on the first line, followed by a second line where the first digit is
repeated 3 (or 4) times and followed by the second digit. This is the “expanded”
digit.

4+2 Format

Comprises a 4-digit subscriber number and 2-digit report code.

ADEMCO Contact ID®

Comprises a 4-digit subscriber number, 1-digit event qualifier

Reporting Format

(“new” or “restore”), 3-digit event code, and 3-digit zone number, user number,
or system status number (see the following page)

The following table shows the message formats for 3+1, 4+1 and 4+2 reports, where:

SSS or SSSS = Subscriber ID

C = Close Code (1st Digit)

A = Alarm Code (1st digit)

U = User Number (in hex)

Z = Typically Zone Number* (2nd digit)