Issue 4.5 August 2005 DM1200 Digital Communicator/Modem 12-3
DM1200 OVERVIEW
The DM1200 is a combined 16-channel digital
communicator and 1200 baud modem.
● The digital communicator monitors the 3GS
controller and reports alarm activity to a central
station(s).
● The modem communicates with a remote printer or
PC running software such as Eurodial (monitoring),
Panelman (maintenance) or 3GS+ (access control).
The unit can be connected to one of the 3GS serial ports
(default=port 2) and its communication parameters may
be programmed from the 3GS keypad. For connection
details, see the 3GS Communications section.
Digital Communicator Operation
The digital communicator monitors the 3GS control line
(CTRL) to determine the state of the system outputs.
● When programming the DM1200, the engineer
maps the 3GS outputs to the DM1200’s channels,
which can number up to 16 in fast format or 8 in
slow format.
● If an output changes state and the delay timer has
timed out, the DM1200 seizes the phone line
(disconnecting any other apparatus connected) and
dials a pre-programmed number.
● The appropriate signals are sent to the alarm central
station receiver, indicating the type of alarm
activation. The DM1200 will disconnect and may
dial another central station and repeat the process if
so programmed.
● Upon contacting the central station, the DM1200
waits for a handshake signal from the central station
receiver. During this period, the unit transmits a
comfort tone every two seconds.
● Upon receiving the fast format handshake, it
transmits the account code associated with the
dialled telephone number and the channel
information in fast format.
● When the acknowledge signal (kissoff) is received,
the DM1200 releases the line. If the receiver sends a
slow format handshake, the DM1200 will report in
slow format. If the DM1200 is unable to
communicate with the alarm central station receiver,
it releases the line and re-dials. It will dial a
secondary receiver number if programmed to do so.
The DM1200 can also be programmed to send
alarm information in SIA and CONTACT-1D formats
(version 3.1 or greater).
Modem Operation
When the DM1200 is programmed to report to a remote
PC, it reads the value stored in the panel’s modem dial
variable every two seconds.
This variable is used by the 3GS to initiate a call to a
remote PC and may be set by a time command or via a
literal. If this variable is set to 1 and there is log
information to report, the DM1200 dials the pre-
programmed primary remote phone number and
establishes a connection with the remote PC. The
DM1200 disconnects the line when the remote PC hangs
up its modem.
Note If the DM1200 detects a channel activating
during remote communication (with the PC or
printer), it aborts modem communication and dials
the alarm central station.
If a remote PC dials in, the DM1200 will pick up the line
after the pre-programmed number of rings have been
detected. It will establish a connection with the remote
modem. At this point, it allows FULL communications
with the 3GS controller if UNRESTRICTED access is
programmed.
If CALLBACK mode is programmed, then on receipt of
an incoming call, the DM1200 answers, hangs up, and
then calls back the number.
The DM1200 also allows communication to a remote
printer. If the mode dial variable is set and there is log
information to report, it dials the pre-programmed
number and dumps to the remote printer.
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