Tag Archives: gsm burglar alarm

GSM Alarm Dialer Scantronic i-on i-on40 Compatibilty Question

Hi,Is this compatible with Scantronic i-40 bugler alarm?
How to wire a Scantronics alarm panel to the Advent Controls GSM Alarm Dialer

GSM Alarm Dialer to i-on40 Wiring

The dialer can be wired to this panel as Cooper Security recommend in their manual a wired bell box to be wired.  That is to make use of one of the output relays (OP1 in the diagram).  When using a relay you wire it in such a way that the input A or B is shorted to GND when the alarm sounds.  The diagram also shows power being derived from the panel.  The AUX 0V terminal goes straight to the GND terminal on the dialer and the 12V terminal goes to the lower VIN terminal on the dialer as this is the connection with the thermal fuse protection in case of accidental short circuit.

If there is no bell connect to your alarm then you will most likely find the TR terminal is already connected to 0v but if not ensure this is connected.  There are alternative ways to wire the unit, such as using the OP3/4 terminals but we would recommend following the advice in the manual.

GSM Dialer

GSM Alarm Auto-dialer

The Advent Controls GSM Alarm Dialer is available here on the Advent Controls website.

Scantronics i-on40 alarm wiring manual


What is the maximum voltage for the optical input on the Alpha GSM Alarm Dialer?

Hello.  What is the maximum voltage for the optical input and what is the voltage required to power the board? Thanks


Advent Controls Alpha GSM Auto Dialer Input Circuit Diagram

Input Circuit Diagram

The input features a 13v overload protection diode and can handle DC voltages up to about 30v.  The input impedance is 4400ohms relative to the +VE supply as can be seen in the input circuit diagram above.  The +V terminal is normally at +VE minus approximately 1.3v which is dropped over the opto-isolator LED.  When the +V terminal is connected to ground current flows from +VE through the resistors R17&R18 and the opto-isolator LED to ground.  This activates the transistor on the digital section shown above.

The input is active low… active when pulled to ground. You can invert the voltage level which causes triggering of the calls/text but your application needs to be able to pull the input to ground when either active or when idle. It can go to any voltage up to about 30v in the other state.  If you have an output which goes positive you can use a low value resistor (~300-600ohms) to pull the input low in the off state.

Most burglar alarms connect the bell -ve supply to ground when the alarm is sounded making this connection ideal.

The board will operate from about 9 to 24VDC.