3. Installation 9751 Installation Guide
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Communicator
Connecting the Communicator
The control unit has an internal communicator on its main PCB. This is an
auto-dialling modem.
If necessary, a standalone communication device can be connected through a
wiring harness to interface pins on the main PCB (this is known as a plug-by
communicator).
The communicator can be used for:
• Transmitting alarm signals to alarm receiving equipment at a central
monitoring station using Scancom Fast Format, Scancom SIA (Security
Industry Association) or Contact ID (set with Command 103).
• Connecting to a PC based at a remote engineering centre. Using
Scantronic Downloader software, the remote PC can upload and download
system parameters (including the event log and diagnostics), set and unset
the alarm system, and carry out other special functions.
Telephone Line
Ideally, the internal communicator should be connected to an ex-directory line
used exclusively for alarm communications.
If an exclusive line is not available and other apparatus is connected to the
line (for example, an answer machine), the internal communicator provides a
series connection with line divert for the other apparatus. When triggered, the
communicator seizes the line and disconnects the other apparatus. When the
communicator shuts down, it reconnects the other apparatus.
Three-way Calling
The control unit provides a three-way calling facility to make sure the internal
communicator can always use a shared telephone line.
To use this facility, the local exchange must provide the three-way calling
service on the customer's line.
Line Monitoring for the Internal Communicator
The control unit provides a line monitoring function to check that a telephone
line connected directly to the control unit is working, and to indicate a line
failure if it is not. While enabled, this function continually checks the line
voltage to ensure that the line is connected. If it detects a failure, the system
gives the Line Fault Response selected with Command 106.
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