1. Overview
Connections: The SD1 is connected between the alarm control panel and the telephone
line. It behaves like another extension to the telephone and does not affect its normal
operationorthatofanyotherextensionfitted. However,ifthe SD1isoperatingthemessages
will be heard if any handset is lifted. The unit requires no batteries as its power and mains
fail back-up are derived from the alarm control panel.
The SD1 accepts three inputs which in our example are; A - Fire, B - Personal Attack (PA) and
C - Burglary. These correspond to the messages (A, B and C) that the SD1 sends out and
should be recorded as such. If the control panel does not have a fire monitoring capability
thentheSD1willacceptadirectconnectionfromasuitablesmokealarm(asabove). Trigger
inputs can be selected as +ve or -ve applied. The SD1 may also be included in the control
panel tamper circuit.
Telephone Numbers: The SD1 will dial up to three different telephone numbers and play
its message. The numbers may be up to 16 digits long and are simply programmed using
the text display and keypad on the unit. Note: Emergency Services numbers cannot be
programmed.
Messages: The SD1 has a built-in microphone and speaker so that phrases can be
recorded and replayed directly from the unit. When the out-going call is answered the SD1
playsa commonphrase (0)andoneofthethreealarmmessages (phrasesA,BorC). Phrase
0 states the identity name and address of the users and phrases A, B and C relate to the
inputs from the control panel (Fire, PA, and Burglary in our example). Each phrase can be
up to 8 seconds long giving a total possible message length of 16 seconds (0 + A, B or C).
Acknowledgement: On receiving a call fromthe SD1 the personanswering acknowledges
it by pressing the number [8] on their telephone*. The SD1 may be programmed to stop
dialling after the first call has been acknowledged or when two or three have been
acknowledged, as required.
If the message is not acknowledged then it is repeated four times after which the dialler
abandons the call. It then dials the next number. This procedure is repeated three times
in sequence for all three telephone numbers. If no acknowledgement has been received
then the dialler shuts down.* Certain older types of telephone may require a tone dialling
simulator to do this.
1 2 3
4 5 6
7 8 9
0
B A
C
Control Panel
Speech Dialler
BT Line
Tel No 1
Tel No 2
Tel No 3
Telephone
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