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Communication Protocol
The standard communication protocol for Whelen’s High Power Voice and Siren System products is a 10
digit DTMF (Dual Tone Multi-Frequency) format. This means that the activation command consists of
ten DTMF digits. The status feedback from a remote siren may have from 10 to 18 digits, depending on
the type of feedback status.
The activation command structure is as follows:
Digits 1-3 = System Area Code
Digits 4-7 = Remote Siren Address Code
Digit 8 = Identification Number
Digit 9,10 = Command
Area Code
Each warning system receives a factory assigned area code. Consideration is given to frequency
allocations to minimize the chance of false activation from a neighboring system.
Remote Siren Address Code
Each remote siren within a system is assigned a unique address. In order to accept a command string, the
remote siren must receive the proper area code and address in the proper order, in a certain time span. A
remote siren will reject any command string that does not meet these requirements.
System “all calls” are permitted through the use of the # symbol (or wildcard). The # may be used in all
four address digits to communicate with all remote siren within the area code or the # may be used in
specific positions to communicate with a group of remote sirens. The # may not be used in the area code.
Identification
The eighth digit identifies which Control Center transmitted the command. There may be up to eight
centers within a system.
Command
These digits define the command. This information is provided for reference only, since in the E-2010 all
commands are selected by name and all response strings are decoded into specific names.
(Do not confuse this with the Command Table used in Call Key programming.)
Summary of Contents for E-2010
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