3. Installation
9752 Installation Guide
Page 30
497098 Issue 3
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
The control unit provides a line monitoring function to check that the
telephone line is connected and 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.