Operation
General
When triggered, the DC58M+ seizes the PSTN line.
When a dial tone is detected the DC58M+ lights
the indicator (LED).
1.
The appropriate telephone number is dialled,
when answered, the alarm receiver will send a
I.D tone. If no I.D tone is received, the DC58M+
will release the line, and repeat the process a
maximum of three times to each selected
telephone number.
2.
When the DC58M+ receives the ID tone it
transmits the appropriate data in the selected
format. If the data is successfully received the
alarm receiver responds with an
acknowledgement tone. The DC58M+
releases the line and flashes the red LED 4
times.
3.
If the acknowledgement tone is not received,
the DC58M+ releases the line and tries again.
4.
After the third dialling attempt has failed a line
fault is signalled to the control panel to allow
any programmed bell delay to be cancelled.
Three-Way Calling
This is one the new features that is available from BT
Network Services, for this feature to work correctly
the telephone line must have this service enabled
(contact BT for further details). In non-UK countries
you can enabled or disable this feature (as well as
pulse dialling) in programming. See page 9,
Porgramming.
When the DC58M+ is triggered the unit checks for
incoming ringing or off hook (someone trying to
block the call). The unit then sends a "Recall"
signal, which is detected by the exchange as a
request for a new line. With a new line available the
DC58M+ then attempts to connect with the ARC.
If the DC58M+ is connected to an older pulse dial
only exchange, the numbers being dialled must
be selected to "Pulse" dial,
see "Telephone
Numbers" on page 10.
This will disable the
three-way calling facility as it is not available on the
older type exchanges.
Line Fault Monitor
The line fault monitor continuously monitors the
PSTN line and will detect:
l
The loss of line voltage (cut line)
l
A line voltage less than 35V (parallel
telephone off hook)
l
An incoming ringing signal that will try and
prevent DC58M+ operation
If the DC58M+ is used on a shared line then the
line fault monitor can be selected to only monitor
a cut line by setting the "HI/LO SECURITY" option to
"LO". It is also recommended that "Three-Way
Calling" is used (see above) so that the security of
the system is not compromised.
Temporary Out of Service
In addition to the line fault monitor, the DC58M+
can be programmed to perform a more detailed
line test at pre-set intervals. The DC58M+ will seize
the line and dial all digits but the last one of
telephone number 1. If the unobtainable tone is
NOT detected it is assumed that the line is healthy
and the unit releases the line. If the unobtainable
tone is detected, a line fault is signalled.
Note: This feature must be disabled if this product
is used in Germany.
5
DC58M+ Installation Instructions
Operation
Содержание DC58M+
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