DualCom GSM Mk1 & Mk2
Installation Manual
Description
DualCom GSM is an advanced auto-dialling Digital Communication Device for
secure alarm reporting. It can transmit alarm signals to an Alarm Receiving
Centre using the GSM, (Global System for Mobile Communications) data net-
work or the PSTN (Public Switched Telephone Network). Dualcom can also be
programmed to send SMS (Short Message Services) to a GSM phone.
Where the installation is specified to the EN 50131 and PD6662 standards then
use of the DualCom GPRS is recommended.
DualCom GSM is supplied with a GSM SIM Card that is enabled for ‘Data’ and
‘SMS’ operation.
When DualCom GSM is triggered by the alarm system it initiates calls to the
Alarm Receiving Centre over both communication paths simultaneously. Once
it has received an acknowledgement signal from one path it clears the calls on
the other paths so that the Alarm Receiving Centre receives only one alarm
notification. Test calls are delivered using both paths to test the system fully.
DualCom GSM monitors both communication paths continuously. A fault on
one path is reported to the Alarm Receiving Centre using the other functioning
path. Any Alarm System bell delay is maintained unless both paths are in fault,
or the Alarm Abort feature is used.
DualCom GSM comes complete with Alarm Abort feature to enable older alarm
systems to comply with the ACPO false alarm policy. Once the system is set,
if a mis-operation occurs and the system is unset within 90 seconds, a restore
on channel 3 or separate code will be sent to the Alarm Receiving Centre. If
programmed, a Tellback will also reset the control panel.
DualCom GSM is available as a stand-alone unit with screw-terminal inputs. A
tamper protected steel box with an integral power supply is also available.
DualCom GSM is housed in an ABS plastic case which protects the electron-
ics and meets PSTN safety requirements.
DualCom GSM has 8 alarm inputs. This can be expanded to 16 by adding an
Expander Board which also provides 8 outputs.
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