Tag Archives: Circuit diagram

Honeywell Intellisense 800 GSM Dialler Wiring Diagram

The Advent Controls GSM Diallers are a good fit for the Honeywell Intellisense 800 Series Burglar Alarm Panels.

The simplest installation is with our A3, A4 or A5 GSM Dialler and SMS Sender Systems available here Advent Ax Diallers

Honeywell Intellisense 800L Wiring Guide

A3 Dialer Simple Wiring Guide

The Input A terminal is connected to the “-S” (bell -ve) terminal.  This triggers the dialler when the bell sounds.  The AUX +/- terminals go to the VINA and GND terminals respectively.

The basic setup required is shown below.  These messages are sent to the phone by the adminstrator (master) mobile phone:

master <your number>.    ;this sets your phone number up as the admin number

callnum <1st number to dial>.     ;this adds a number for dialing to the system

textnum <1st number to text>.     ;this adds a number for receiving messages

Once the master number has been added remove the jumper.

If you would like to customise the message the recipients receive send the following:

customA the alarm is sounding.     ;you must add a full stop

If you would also like to know when the alarm stops send:

inlevelA both

customAL the alarm is sounding.

customAH the alarm has stoppped.

On Off Alarm control

Arming the Alarm with a GSM Dialer

If you would also like to arm the alarm using the Advent Controls A3/A4 or A5 GSM Alarm Diallers you can connect the on-board relay to the zone 8 terminals using the COM and NC relay connections.

To arm the alarm the SIM card telephone number is dialled from any user number. You can also set the alarm by sending “On 1” from any registered phone.

To enable this mode on your Honeywell Intellisense 800L Alarm Panel (manual available here) zone 8 must be set up as a keyswitch input as follows:

On the alarm panel, to enter engineering mode, enter the engineering code and then press the #(HASH) key. This forces the panel into engineering mode Note: If left unattended for approximately 60 seconds it will revert to day mode.

To program zone 8 as a “Keyswitch” enter – 4 8 4 *

Zone monitoring with GSM Dialer

Intellisense Wiring Diagram with Zone Monitoring

If you would like to monitor individual zones the Advent Controls D4 GSM Dialler System is required.  This Cellular Alarm Dialler PCB is able to monitor individual zones by measuring the voltage on the switched zone terminal.  When the zone is triggered the voltage rises above zero.  To initiate calling and SMS messaging the upper trigger voltage must be set below the maximum voltage this zone reaches when the sensor triggers.  Typically this voltage should be set to 2V as follows:

vupper1 2.0     ;this sets the trigger voltage to 2V for Analogue Channel 1

If this does not trigger the unit when the zone is active ensure the correct terminal is wired in (one of the two zone terminals will be a 0V terminal – the other a switched trigger terminal).

The voltage on the zone can be monitored at any time using the STATUS command.


Citadel Xr2 GSM Alarm Dialer/SMS Sender Wiring Guide Aico Smoke Alarm

We received this question via email:


I would like to connect two devices to the Dialer:

Input One : Burglar Alarm

Input Two: Smoke Alarm

I have an Citadel Xr2 alarm system which I assume is pretty standard to get a signal from it [it is!].
The smoke detectors are from the Aico range, and would be interfaced through a Relay base Ei128RBU.


Wiring the Citadel Alarm and Aico Smoke alarms to the Advent Controls GSM Alarm Auto-dialer and SMS Sender is very straight forward and the default input settings can be used.  The 0v terminal on the alarm panel and the GND terminal on the dialer must be connected together.  The bell -ve terminal is also connected to the selected input on the dialer.

Citadel Xr2 GSM dialer wiring with Aico Alarm

Citadel Xr2 Wiring Guide

The Aico Alarm has a set of relay output contacts which can be connected directly to Input B (in general ensure they are Volt-free and do not supply mains voltages!!).  Use the COM and NO terminals on the alarm as shown in the diagram.

For a basic setup you will need to send these messages:

master <your mobile number>.   (this sets your phone up as an administrator – remove red jumper afterwards)

callnum <1st number to be rung>.

callnum <2nd number to be rung>.  (you can keep doing this!)

textnum <text recipient>.

textnum <another SMS recipient>.  (again there is space for over 250 numbers)

If you would like the messages to say something specific you can send (for example):

customa the burglar alarm is sounding.

customb the fire alarm is sounding.

If you would like to know when the alarms have stopped sounding send these commands:

inlevela both

inlevelb both

customah the burglar alarm has stopped sounding.

custombh the fire alarm has stopped sounding.

The Advent Controls GSM Alarm dialer and SMS sender is available from the Advent Controls website here.

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

GSM Dialer/Gate Opener Current Consumption Question

Hi there,
How many milliamps does it need from the alarm board to run?

(no name supplied)

GSM Dialer Current at various voltages

GSM Dialer Current Graph

As can be seen from the graph the current consumption drops with increasing supply voltage.  The is due to the use of an efficient Switch Mode Power Supply (SMPS) buck regulator on board which converts a high voltage at low current to the low voltage and high current required by the GSM transmitter chipset.  The GSM system requires up to 2 Amps at 3.6v.  However, due to the SMPS at 28v the current requirements during transmission are as low as 60mA average.  This can also be explained due to the 12.5% duty cycle used during GSM TDMA transmissions.  GSM transmits only in short powerful bursts with a 1/8th duty cycle.

The system’s electrical energy requirement every second (by definition this is know as Power) is the same whether the PCB is supplied by 12v, 18v or 28v.  Power consumption can be calculated for DC loads using the following formula:

Power  = Voltage x Current  normally written  P = VI

The inverse current plot is expected when we re-arrange the formula as follows:

I = P/V

As the power requirement, P, is constant no matter what voltage we supply we see as the voltage, V, is increased I, the current, must be reduced.

GSM Dialer power requirement

GSM Dialer Power Consumption

The above graph showing power consumption at various voltages shows the most efficient supply voltage is approximately 12v particularly when idling.

Please note these figures were obtained on the 1800MHz band (EE network) with a low RSSI of 10.  They were obtained during the higher power ringing phase and would drop during talk-time.  Transmission at 900MHz (O2 network) may give higher current consumption due to the higher power output of the transmitter but may also be lower if the signal strength is superior.
Here is the measured current consumption at various DC voltages:

20mA idle
60mA during call (peak 70mA with relay on)
26mA idle
95mA call (115ma Relay)
30mA Idle
110mA (145mA Relay)
127mA (160mA Relay)



The GSM Alarm Dialer and SMS sender is available from the Advent Controls website using the following link:


Alpha GSM Gate Opener and Alarm Dialer Schematic

GSM Gate Opener Circuit Diagram

Advent Controls Alpha Relay Board Schematic Diagram

The above figure shows an early Advent Controls Alpha GSM Gate Opener and Alarm Auto-dialer circuit schematic diagram.  There have been a few updates to the design over time but the basic elements of the design remain.

The top left hand section shows the DC to DC converter (based on the AP5004 300kHz switching regulator) which takes the 12-24VDC supply and converts it to a lower voltage suitable for running the GSM chipset and base-band output drivers.  The relay is also powered directly from this supply.  For further details see this article here.

We then move on to the opto-isolated input circuit (based on the KB817 part) which connects the outside world to the low voltage digital section on the microcontroller.  Please see this article for further details.

In the centre of the diagram we have the relay output section which is how the board outputs to the real world.  For further information please view this article.

On the right hand side of the diagram we have a very interesting circuit.  This section converts the audio output from the GSM chipset – the voices and tones heard through the phone – into a form which the simple microcontroller can understand.  For further details on how this section works please see this post.

The bottom left of the schematic shows the heart of the system – the GSM engine built around the MediaTek MT6252DA built into a seperate module by our commercial partners Quectel.  There is more information of this subsection here.

If the GSM engine is the heart of the system the PIC16F1825 microcontroller which runs our firmware is the brain of the unit.  This component is an entire computer in one chip featuring RAM, a CPU and flash EEPROM program memory (effectively the internal  hard drive).  It handles all of the GSM commands, connects the input and output to the real world, performs Digital Signal Processing (DSP) on the all the of the audio received by the board and stores all of the user telephone numbers and setting.  This device is what allows our board to be so compact.

PCB fiducial markers for accurate placment of the GSM module on the alpha relay board

GSM Module Fiducial Markers

We were asked what the two circles with dots in the centre were.  These are fiducial markers which appear on the PCB.  They help the pick and place machine which assembles the board accurately position the module in to place.  The placement of this component is critical to ensure the antenna matches the GSM output.