GS3125/GS3105
59
G
G
G
G
G
OPERATING PRINCIPLES
This Communicator offers the option of selecting the “Primary Path” for communication purposes. Will provide the line ring voltage for incoming
calls and will decode DTMF dialling. The Simulated land line provides the alarm control panel or an alternative communication terminal, with
a backup line in the event of PSTN line trouble. Commutation between PSTN and GSM, does NOT occur during ongoing calls. The
Operating priority (selected during programming) determines how this Communicator manages communication (SMS and voice for the
GS3125 only series), as well as calls from telephone devices connected to the LI terminals (such as a burglar alarm control panel).
This Communicator is unable to decode Pulse dialling.
To prevent any unwanted use of a simulated line via GSM, the equipment gives out a signal in the form of a double beep
during vocal calls. The first double beep is produced after 5 minutes and the following ones at 30 second intervals each.
Restore default programming
To restore the default programming of the transmitter, proceed as follows:
1. Disconnect the transmitter from the power supply.
2. Keep terminals 1 and 4 on connector [9] (fig. 5, page 65) short-circuited, using clamps for example, and restore the power supply.
3. The 5 LEDs (L1, L2, L3, L4 and L5) will light up briefly (less than 1 second).
4. As soon as the short circuit is detected, the 3 green LEDs (L1, L2, L3) switch off, while the yellow and red LEDs (L4, L5)
remain illuminated (for a few seconds) to indicate that default programming is being restored.
5. When the yellow and red LEDs (L4, L5) light up, remove the short circuit between terminals 1 and 4 on connector [9] (fig. 5, page 65).
6. Once this procedure is complete, the 3 green LEDs flash to indicate that the transmitter is initialising.
Recorded voice messages are NOT deleted when the default settings are restored.
PSTN pre-set channel
If the voltage on the land line terminals (LE) drops below 3 Vdc for a period of between 10 to 3600 seconds (programmable
value), this Device will switch the connected telephone device (connected to the LI terminals) to the GSM Network. When
the PSTN telephone line is restored, it commutates once again, after a programmed period of time, to the PSTN telephone line.
GSM pre-set channel
This provides the devices connected to the LI terminals with a simulated line if GSM reception is detected. If there is no GSM
reception, it commutates to the PSTN telephone line.
Contact ID transmission sequence on GPRS
The Communicator, if telephone numbers have been entered on the page GPRS->Telephone numbers to decode for
decoding using the GS3100 Series Console software, directs calls to these numbers over the GPRS line.
When an event is triggered, the Alarm Panel goes off-hook.
The Communicator will assert dial tone.
Control Panel dials the number of the central station. Ensure the alarm panel inserts a minimum 1-second pause, or has
dial tone search enabled before dialing the number.
The Communicator will send the required Contact ID dual tone handshake.
After receiving the handshake, panel transmits alarm message in DTMF format.
The Communicator decodes and transforms DTMF digits into the packet and sends it to the Central Station Receiver over
the GPRS network.
The receiver acknowledges the event and sends the command to this Communicator, which generates the corresponding
kiss-off signal (at a frequency of 1400 Hz) and sends it to the control panel.
After the Communicator generates kiss-off, the panel goes on-hook if no more alarms need to be sent, or it can send the next alarm.
Green LED
flashes
Meaning of indication
L1
Voice message transmission in progress
L3
Remote Session; will flash until you exit the GPRS remote session.
L1+L2
Service mode; flashing continues until the device exits this mode
L1+L3
Incoming SMS message; will flash for 5 seconds.
L1+L2+L3
The Communicator is initialising; flashing continues until a GSM
signal is found
Table 2 - GS3125
Communicator status
indications provided by
the flashing of the green
LEDs (L1, L2, L3).
