32 — Installation & Programming Guide
Series Handset Disconnect.
Provision has been made to allow for connection of up to three telephone handsets on the
same telephone line. These handsets MUST be connected in series, with the
communicator as the first apparatus connected to the master telephone socket.
Connection of the communicator and telephone handsets are made via connector CN13 on
the network side of the PCB.
When any handset is attached, the communicator must be programmed so that it is made
aware of such an attachment. This avoids having the ‘loss of line’ conditions reported when
the handset is in use, causing line fault transmissions to the central station.
If a handset is attached, and the communicator has been suitably programmed, then Line
Blocked and Exchange Voltage reporting back to the panel will be suppressed unless the
panel is fully set.
Connecting handsets in any configuration other than the method stated above (such
as parallel connection) will invalidate Telecommunications approval.
DTMF and Pulse dial.
The communicator is capable of both DTMF and Pulse (loop disconnect) dialling of the
programmed telephone numbers and is user selectable via the communicator
Programming Interface. Dialling will only commence in the presence of a valid proceed
indication (dial tone) and will employ ‘Timed Break Recall’ after 5 seconds in the absence
of dial tone. If the exchange still fails to provide dial tone, Smartdial will release the line
after a further 5 seconds. This will use up a connect attempt.
8 Channel Fast Format Alarm Reporting.
Alarm data is represented by 8 channels. When any channel changes state, the
communicator is triggered to initiate a call to the programmed central station. Each channel
can assume one of six states - No Alarm, New Alarm, Continuing Alarm, Alarm Restore,
New Opening or New Closing.
The manner in which the transitions between these states are reported to the Central
Station is dependent upon how the communicator is programmed to respond.
For example, the Channel information may be encoded in the following way........
Channel Designated Meaning
1 Isolated Set
2 PA/Duress
3 Intruder
4 Fire
5 Tamper/Fault
6 Full Set/Unset
7 Mains Failure
8 Low Voltage
....or any other combination which the panel has been programmed to report. The actual
meaning given to each channel is known only to the panel and the central station.
Alarm and restore events are reported to the programmed central station using the protocol
defined in the draft IEC publication 839 part 8 - “DTMF protocol for use in Digital Commu-
nicator Systems at Interfaces with the PSTN”. The protocol types supported are as follows:
a) 4-8-1/1 4 digit UID, 8 digit channel data , 1 digit status - handshake type 1
b) 4-8-1/2 4 digit UID, 8 digit channel data , 1 digit status - handshake type 2
