215568 - ALARM SYSTEM
The alarm sytem is one of the devices that contributes in protecting the vehicle.AIM
The alarm system has the function of protecting the vehicle from unauthorized access, detecting and signalling attempts at intrusion with visual/acoustic warnings.GENERAL DESCRIPTION
The alarm system carries out perimeter and volumetric surveillance, surveillance against the vehicle being tilted and surveillance of the supply leads and ignition.The switching on of the alarm system is shown by the direction indicators coming on constantly and a beep from the siren in conjunction with the direction indicators coming on.At this point a deterrent warning light/LED located in each door panel flashes intermittently to indicate the surveillance state.The alarm system is homologated in accordance with directive 95/56/CE and conforms with the requirements of European insurance companies and their associated technical centres.DESCRIPTION OF THE SYSTEM COMPONENTS
The basic alarm system components are:- Body Computer Node (NBC)
- Alarm siren
- Volumetric sensors
- Tilt sensor
- Perimeter sensors (door, boot lid and bonnet switches)
- Transmitter in key-remote control or in CID
Body Computer Node (NBC)
The NBC is also dedicated to the management of the alarm system.Several functions are also implemented that make it possible to co-ordinate and manage the alarm system sending and receiving commands from the external modules on the A-BUS serial line.Alarm siren
The alarm system is equipped with a self-supplied siren.The siren carries out two functions:- 1. Acoustically signalling an attempt to break in and damage the vehicle.
- 2. Emitting the system beep signalling noises.
Specifcations
The main specifications of the siren are:- sealed casing (IP66)
- NiMH green batteries for independent supply if the main vehicle battery supply leads are interrupted
- dialogue with the NBC and other alarm system components on the serial line
- autodiagnostic function
- maximum permitted current consumption:
- Sound power (when supplied): 107 - 118 dBA/2 metres
| SIREN OPERATING STATE | ABSORPTION MAXIMUM CURRENT (at 12.5 V) |
|---|---|
| REST | 2.5 mA |
| battery recharging | 15 mA |
| SURVEILLANCE | 5 mA |
| ALARM | 2 A |
| PIN | I/O | Imax | FUNCTION |
|---|---|---|---|
| 1 | IN | 2 | SUPPLY POSITIVE (+30) (PROTECTED BY NON DEDICATED FUSE) |
| 2 | IN - OUT | 10 mA | SERIAL COMMUNICATION LINE WITH BODY COMPUTER |
| 3 | IN | 2 | GND |
| 4 | N.C. | --- | N.C. |
- Voltage range: 9 - 16 V. Below the minimum voltage the siren receives a supply from its own internal battery.
- Temperature range: - 40° / + 85°C (if connected to the main supply); -20° / + 85°C (if receiving its own supply)
Serial connection
The siren is connected to the A-BUS serial line, therefore it is connected with the NBC and all the sensors/actuators for the vehicle protection sub-systems.This connection allow the exchange of commands between the two units (siren and NBC). If this connection fails, the possibility of communication is lost.In addition, if the serial line is overloaded, the siren functions take priority over other communication on the line.If the main supply leads are cut and the internal batteries are charged, the siren can:- with the +30 cut, communicate in two directions
- with the earth cut, receive, but not reply (this produces alarm signals)
Device operating states
There are 5 different operating states for the siren:- WAREHOUSE
- REST
- SURVEILLANCE
- ALARM
- DIAGNOSIS
- from the REST state (if the outside supply fails)
- from the ALARM state (at the end of the signals for cutting the supply leads)
- there is no + 15 signal
- the siren receives a command to switch on
- 5 secs after the key-on
- SURVEILLANCE: using the control for switching the siren on
- ALARM: if the acoustic warning siren cycle is activated
- WAREHOUSE: following a decrease in the supply
- DIAGNOSIS: following a specific command
- a fall in the main supply voltage: if the battery voltage goes below 3 V, the siren sets of the alarm cycles.
- Cutting of +30 lead: in this case the siren starts the acoustic alarm cycle until normal supply conditions are restored or the alarm is switched off. The maximum number of alarm cycles implemented by the siren corresponds to the figure transmitted by the NBC at the time it is switched on.
- Cutting the earth lead: the siren does not immediately set off the alarm cycle, but waits for the NBC to make itself available. In effect, in normal operating conditions, to check the condition of the connection, the NBC sends the siren a signal known as a heart-beat approximately every 500 ms. If the siren does not receive this signal for a maximum time of 0.5 secs, the alarm cycles commence. When the alarm cycles are over, the siren goes into the WAREHOUSE state. Given that the NBC is not capable of transmitting the heart-beat signal below certain battery voltage values, if the emission of the signal is interrupted, the siren checks that the battery voltage is above 7.5 V and, if it is below this, the alarm acoustic signals are inhibited.
- Cutting the serial communication line cable: the reaction logic is the same following the cutting of the earth lead. The only difference is that, at the end of the alarm cycles, the siren moves to the REST state.
- ALARM
- REST: if the command to switch off is received.
- DIAGNOSIS: following a specific command.
| Country | EEC | G.B. | BELGIUM | HOLLAND | WORLD |
|---|---|---|---|---|---|
| MODE | 1 | 2 | 3 | 4 | 5 |
| NUMBER OF DOOR/BONNET/BOOT/KEY ON ALARM CYCLES | 3 | 8 | 3 | 3 | 3 |
| NUMBER OF VOLUMETRIC AND TILT ALARM CYCLES | 3 | 8 | 3 | 3 | 3 |
| NUMBER OF CABLE CUTTING ALARM CYCLES | 3 | 12 | 3 | 3 | 3 |
| TOTAL NUMBER OF ALARM CYCLES | 10 | 24 | 12 | 12 | 10 |
| PAUSE BETWEEN ALARM CYCLES (S) | 6 | 6 | 4 | 6 | 6 |
| SIREN ALARM TIME (S) | 26 | 26 | 26 | 26 | 26 |
| SIREN POWER (DBA) | 110 | 110 | 110 | 114 | 110 |
| TYPE OF ACOUSTIC SIGNAL | CONTINUOUS | CONTINUOUS | CONTINUOUS | CONTINUOUS | CONTINUOUS |
| TYPE OF SIREN SOUND | MODULATED | MODULATED | MODULATED | MODULATED | MODULATED |
| SIREN FREQUENCY MODULATION (HZ) | 2±1 | 2±1 | 2±1 | 2±1 | 2±1 |
| SIREN SOUND FREQUENCY (HZ) | 1800÷3500 | 1800÷3500 | 1800÷3500 | 1800÷3500 | 1800÷3500 |
- SURVEILLANCE: at the end of an alarm cycle requested by the NBC
- REST: if the command to switch off is received or at the end of alarm cycles resulting from cable cutting.
- DIAGNOSIS: at the end of alarm cycles resulting from supply cable cutting.
Volumetric sensors
The main purpose of the volumetric sensors is to detect an attempt to intrude into the passenger compartment using ultrasound.A variation in the volume inside the passenger compartment, identified by the waves, produces a signal which is sent to the NBC which implements the appropriate alarm procedure.The volumetric sensors are integrated in the Roof Node (NIM). It manages the software functions, houses the on/off button and operates the LED which is incorporated in the button and which warns about the implementation of the control.The switching on/off of the sensor is controlled by the A-BUS serial line.Specifcations
The volumetric sensor has a 4-way connector with the following pin out:- 1 = Supply positive (+30)
- 2 = Negative (earth)
- 3 = +15
- 4 = Serial line (A-BUS)
- Voltage range: 8 - 16 V.
- Temperature range: - 40° / + 85°C
- Wave emission frequency: 40 Khz
- Maximum permitted current consumption:
| SIREN OPERATING STATE | ABSORPTION MAXIMUM CURRENT (at 12.5 V) |
|---|---|
| REST | 2.5 mA |
| SURVEILLANCE |
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