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Device description and function
The InterCom GSM can be used as an accessory of external units of intercoms until 4 flat systems as well as applicable as
a gate control unit too. By using the InterCom GSM, it is not necessary to build a complete intercom system on the grounds
that the mobile phones will be used instead of the internal unit. Depending on the type of the intercom, the already existing
external unit and the GSM module can be used simultaneously as well.
It can linked to 4+n wire, up to 4 flat intercom systems. One main phone number and 1-1 reserve phone number can be
given at each flat. In case the main phone number is not answering, the module initiates a call to the second reserve phone
number. The ring time can be modified.
Between the module and the mobile phone a voice call will be taken place, which envolves call charges. Therefore, it is
worth to take the package of the SIM card which is in the phone into account in order to charge the owner of the SIM card
the least costs. Moreover, you can determine the maximum time of the call, thus, you can avoid the further costs that are
caused by long talks.
After answering the call, a two-sided communication will be taken place between the person who is at the gate and who
uses the mobile phone. The GSM module allows controlling the two output separately during the voice call, hence, the gate
can be opened remotely without breaking the call.
The module is equipped with two relay outputs ( the first is NO/NC, the second is NO), which can be activated during voice
call with the 4. and 6. button of the phone. The outputs can be applicated in monostable or bistable mode as well.
The output control is possible with free call from unlimited number. In case of caller identification, we can store up to 1000
numbers in the inner memory of the module. Also we can save numbers to the SIM card, which can be 250/500 numbers
depending on the type of the SIM card. By caller identification the unauthorized controlling can be forbidden.
The device allows to use a night shift mode. It means that we can set a time interval, in between the module will not
initiate a call. In this mode, the outputs can be managed by incoming call.
The module can store up to 16,000 events in which the states of the inputs and outputs, power supply resets, GSM network
and module state related information, incoming and outgoing calls and SMSs are saved.
The tamper input on the module can be used as a sabotage indicator with setting possibilities alike to inputs. Shortening it
before powering on then cut short in 3 seconds functions as a ’’reset’’ that can revert the module back to its original factory
state.
Implemented Anti Jammer System (AJS) protects from GSM jammers. The significant dropping of the GSM strength or a
network connection failure initiates a prompt alarm. In these situations module tries to send notifications using network
possibilities still available. It can be set that by controlling the output even a siren can be managed. This possibility is
especially useful if we would like to fob the person who committed the sabotage.
Besides continuous voltage monitoring the module observes also the GSM strength. These data can be readout and these
can be charted even by hourly divisions by the programming and surveillance software.
The module can be programmed by SMS command, voice menu, PC or by Android mobile phone.
Figure 1: Device operation
