FIGURE 4-11 Wiring diagram showing how S 1 and S 2 changes can bypass the entry detector switch in Visual Studio .NET

Encoding Data Matrix in Visual Studio .NET FIGURE 4-11 Wiring diagram showing how S 1 and S 2 changes can bypass the entry detector switch

FIGURE 4-11 Wiring diagram showing how S 1 and S 2 changes can bypass the entry detector switch
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FIGURE 4-12 Typical alarm bell
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Auxiliary Power/Battery Charger A complete alarm system should have an auxiliary power source or battery charger so that the system can operate in situations where the normal 120-volt power supply is cut off See Figure 4-2
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A TYPICAL ELECTRONIC SECURITY SYSTEM
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A number of electronic security systems are available Most have standard parts that can be programmed to operate in a number of different con gurations The installation instructions that come with the system indicate how the system is to be wired
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ALARM SYSTEMS
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PARTS OF THE SYSTEM
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A typical microcomputer-based system has about eight fully programmable zones, plus keypad and re, police, and medical emergency functions Each installation may be custom-designed to meet speci c requirements These systems are nonvolatile electrically erasable read-only memory (EEROM) chips to store all data This memory is retained even during complete power failures All programming is accomplished by entering data through remote digital keypads These keypads are available in different styles, providing exibility in system design Some include a speaker that may be used as an indoor siren and/or an intercom station See Figure 4-13 The control panel houses the electronics for controlling the burglary or re system and the digital communicator The communicator itself is also keypad-programmable and may be programmed for most transmission formats The control panel also contains a 12-volt DC, 15-ampere power supply that will provide 900 milliamperes of power for auxiliary devices Entry Delay Lines Each zone in the system may be programmed for two entry times (from 000 to 225 seconds duration) After a time is programmed into each delay time s memory location, each separate zone may then be programmed for entry delay time #1 or #2 For example, a long delay time (#1) might be used for a garage door to allow suf cient time for car entry or exit, whereas a shorter delay time (#2) would be programmed for front door entry Loop Response Time The system may also be programmed for fast or slow loop response times, or how long it takes for the switch on or off condition to be acted upon by the control unit These range from 40 milliseconds to 10 seconds in 40-millisecond increments After the fast and slow loop response times are programmed, each separate zone may then be programmed for slow or fast loop response time Keyswitch Zones If the application calls for arm/disarm control from a keyswitch, the system may be programmed for a key-switch zone (a zone operated by using a key to turn a switch) Through keypad programming, the installer assigns one zone as a key-switch zone This then can be controlled by a momentary normally open or a momentary normally closed key-switch In some cases, a keyoperated switch is desired for the garage door or a gate
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SPECIAL
CHME
EXTERIOR NIGHT SENSOR
AWAY INSIANT
AWAY PHONE
NIGHT
TEST CANCEL
TEST
DISARM
BYPASS
STATUS TEST WEEKLY
FIGURE 4-13 Remote digital keypad
Bypassing Zones Zones may be individually bypassed (shunted) with a two-keystroke operation at the remote control keypad All manually bypassed zones are cleared when the system is disarmed They must then be bypassed again before the system is armed Zones cannot be bypassed once the system is armed For special applications, re zones may be programmed to be shuntable The digital communicator can also be programmed to send a bypassedzone-arming report to the central station
ALARM SYSTEMS
Fire Zones and Day Zones Both re zones and day zones sound an audible pre-alarm for a trouble condition The user can easily silence a re pre-alarm at the keypad by pressing the CLEAR key, while an LED will remain blinking to remind the user that a trouble condition exists Alarm Outputs A number of alarm outputs may be wired to operate two on-board auxiliary relays The burglar alarm output can be programmed to be steady or pulsing The auxiliary relay outputs can be connected to a self-contained siren, a two-tone siren driver, or an eight-tone siren driver Alarm outputs can be programmed to provide a 1-second siren or bell test upon arming the system To extend the system s capability, the alarm outputs can be wired directly to a siren driver with trigger inputs (such as the eight-tone driver), freeing the onboard auxiliary relays for other tasks A typical electronic system can also be programmed for silent or audible alarms There are separate outputs for burglary, re, police, and medical Each can be individually programmed for a cut-off time of 0001 to 255 minutes or for continuous operation A lamp output terminal is activated for 2 minutes each time a key is pressed during entry and exit delay and during any alarm condition It can be used as light control for a hall light or other applications Arm/Disarm Codes Most systems have arm/disarm codes and a master programming code that can be changed by the user The codes can be one to ve digits long and digits may be repeated Each of the arm/disarm codes in the system illustrated can be programmed to be 1 An arm/disarm code only 2 An access code only(The system includes an access control feature that can be used for an electric door release or oilier device The access control output is timed It is programmable for 1 to 254 seconds in duration) 3 An arm/disarm code if 1 is entered rst; an access code if 0 is entered rst 4 Arm/disarm and access simultaneously 5 Same as (4), plus just 0 and code allows access 6 A duress code
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