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
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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.” If the secondary number is a pager, “FC” displays after the first 8 attempts to the primary number.
The following chart defines the three sets of (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 | 1400Hz |
| 1900Hz (10PPS) | 1400Hz |
| Under 15 seconds |
| 3+1 |
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| (Standard report) |
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| 4+1 |
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| 4+2 |
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| Sescoa/Rad | 2300Hz |
| 1900Hz (20PPS) | 2300Hz |
| Under 10 seconds |
| 3+1 |
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| (Standard report) |
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| 4+1 |
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| 4+2 |
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| Express | DTMF (10 cps) | 1400Hz |
| Under 3 seconds | ||
| 4+2 |
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| Contact ID® | DTMF (10 cps) | 1400Hz |
| Under 3 seconds | ||
| Report Code Formats |
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| 3+1 and 4+1 Standard Formats | Comprise a 3- (or | |||||
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| code (e.g. alarm, trouble, restore, open, close, etc). | ||||
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| 3+1 and 4+1 Expanded Formats | Comprise a 3- (or | |||||
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| The first digit is displayed on the first line, followed by a second line | ||||
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| where the first digit is repeated 3 (or 4) times and followed by the | ||||
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| second digit. This is the “expanded” digit. |
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| 4+2 Format |
| Comprises a | ||||
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| ADEMCO Contact ID® | Comprises a | |||||
| Reporting Format |
| (“new” or “restore”), | ||||
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| 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
A = Alarm Code (1st digit)
Z= Typically Zone Number* (2nd digit) Tt = Trouble Code (1st & 2nd digits) Bb = Bypass Code (1st & 2nd digits)
EA C = AC Loss Code (1st & 2nd digits)
LLB = Low Battery Code (1st & 2nd digits) O = Open Code (1st Digit)
| C | = Close Code (1st Digit) |
U | = | User Number (in hex) |
Gg | = | Test Code (1st & 2nd digits) |
R | = | Alarm Restore Code |
R T t | = | Trouble Restore Code (1st & 2nd digits) |
R B b | = | Bypass Restore Code (1st & 2nd digits) |
R A A C | = | AC Restore Code (1st & 2nd digits) |
R L L B | = | Battery Restore Code (1st & 2nd digits) |
*Zone numbers for: [*] & [#] = 99; [1] + [*] = 95; [3] + [#] = 96; Duress = 92
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