Access Control System

What is Access Control System

An Access Control System is a security system that controls who can enter or exit a building, room, or restricted area.

It allows only authorized users to gain access using methods like RFID cards, fingerprints, PIN codes, or face recognition, and it blocks unauthorized people.

How it works

When a person tries to enter, they must verify their identity using a card reader, biometric device, or keypad. The system checks the data in its database. If the information is correct, it sends a signal to unlock the door (usually an EM lock or electric lock). If not, access is denied.

Real example

In an office, employees use RFID cards or fingerprints to enter the main door. When they scan their card or fingerprint, the system verifies their identity and automatically unlocks the EM lock door. Visitors without permission cannot enter.

Where it is used

Access control systems are used in offices, banks, hospitals, apartments, server rooms, and secure buildings.

Key idea

It is a system that replaces traditional keys with electronic authentication methods for better security, monitoring, and control.

Types of Access Control Systems

Discretionary Access Control (DAC)

Discretionary Access Control (DAC) is a type of access control system where the owner or administrator decides who can access a resource. It is flexible and commonly used in basic computer and file sharing systems, but it can be less secure because permissions can be changed easily.

Mandatory Access Control (MAC)

Mandatory Access Control (MAC) is a strict security system where access decisions are controlled by a central authority or system policy. Users cannot change permissions on their own. It is mainly used in military, government, and highly secure environments.

Role-Based Access Control (RBAC)

Role-Based Access Control (RBAC) is a system where access is given based on the user’s role in an organization. For example, managers may have full access while normal employees have limited access. This makes it easy to manage large organizations.

Rule-Based Access Control

Rule-Based Access Control works by applying specific rules such as time, location, or conditions. For example, a door may only open during office hours or only when a valid condition is met.

Physical Access Control System

Physical Access Control System is used to control entry to buildings or rooms using hardware devices like RFID cards, biometric scanners, PIN keypads, and EM locks. It is commonly used in offices, apartments, and secure buildings.

Logical Access Control System

Logical Access Control System is used to control access to computer systems, networks, and digital data. It includes login passwords, user permissions, and network security controls.

Multi-Factor Access Control (MFA)

Multi-Factor Access Control (MFA) uses more than one method of verification for higher security. For example, a system may require both an RFID card and a fingerprint scan, or a password and OTP.

Biometric Access Control

Biometric Access Control uses unique human features such as fingerprints, face recognition, or iris scans to verify identity. It provides high security because biometric data is difficult to copy.

Card-Based Access Control

Card-Based Access Control uses RFID or smart cards to allow entry. Users simply tap or show their card to a reader to unlock doors or systems.

Mobile-Based Access Control

Mobile-Based Access Control uses smartphones for authentication. It works with NFC, Bluetooth, or mobile apps to open doors or grant access without physical cards.

DAC (Discretionary Access Control) – Owner decides who can access resources
MAC (Mandatory Access Control) – Central authority controls all permissions
RBAC (Role-Based Access Control) – Access based on user roles
Rule-Based Access Control – Access based on rules like time or condition
Physical Access Control – Controls entry using cards, biometrics, or devices
Logical Access Control – Controls access to systems and data
MFA (Multi-Factor Access Control) – Uses multiple verification methods
Biometric Access Control – Uses fingerprint, face, or iris recognition
Card-Based Access Control – Uses RFID or smart cards for entry
Mobile-Based Access Control – Uses smartphone-based authentication

What is the Difference Between a Standalone Access Control System
and a Multi-door Access Control System

Standalone Access Control System:

A standalone access control system works as a single door independent unit where the reader, controller, and memory are built into the same device or simple setup, and it does not depend on a central server.

Multi-Door Access Control System:

A multi-door access control system controls multiple doors from one central controller/software, allowing centralized management, monitoring, and user control for an entire building or network.

Differences

Standalone system controls only one door, while multi-door system controls many doors
Standalone works independently, multi-door works with a central controller/server
Standalone has limited user storage, multi-door supports large user databases
Standalone is simple and low cost, multi-door is advanced and expensive
Standalone is used for small offices, homes, multi-door is used for corporates, banks, hospitals
Standalone has no real-time central monitoring, multi-door allows live monitoring of all doors
Standalone setup is easy to install, multi-door requires network configuration and wiring

Multidoor Access Controller | 4-Door |Size:218x15x45mm|TCP/IP & RS485 -Communication

Essl9500 Usb Fingerprint Scanner

The Controller has AUX IN and AUX OUT Terminals What are they used for

AUX IN (Auxiliary Input)

AUX IN stands for Auxiliary Input. It is an input terminal on the access control controller used to receive signals from external devices, sensors, or switches. These input signals help the controller understand different events or conditions and perform specific actions automatically.
Different devices can be connected to AUX IN terminals such as exit buttons, door magnetic sensors, fire alarm systems, emergency switches, radar sensors, and motion detectors. When one of these devices sends a signal to the controller, the controller processes that signal according to its programming.
For example, in a building access control system, a fire alarm panel may be connected to the AUX IN terminal. During a fire emergency, the fire alarm sends a signal to the controller through AUX IN. The controller then automatically releases all EM locks so people can exit the building safely.
Another real example is a door sensor connected to AUX IN. The sensor monitors whether the door is open or closed. If someone keeps the door open for too long, the controller detects this condition and can trigger an alarm or warning message.
AUX IN terminals are important because they allow the access control system to interact with other security and automation devices. This improves safety, monitoring, and automation within the building.

AUX OUT (Auxiliary Output)

AUX OUT stands for Auxiliary Output. It is an output terminal on the controller used to send signals from the access control system to external devices. The controller uses AUX OUT to activate or control connected equipment when certain events occur.
Various devices can be connected to AUX OUT terminals including alarm sirens, buzzers, indicator lights, relays, door bells, automatic door systems, and warning systems. When the controller detects a programmed event, it sends an electrical signal through AUX OUT to operate the connected device.
For example, if an unauthorized person tries to open a secure door, the controller can send a signal through AUX OUT to activate a siren alarm or flashing light. This immediately alerts security staff about the unauthorized access attempt.
Another real example is a door-open-too-long warning system. If a door remains open beyond the allowed time, the controller sends a signal from AUX OUT to a buzzer. The buzzer then produces an audible warning until the door is properly closed.
AUX OUT is also commonly used for integration with automation systems. In some offices, the controller can send a signal to automatic sliding doors, elevators, or lighting systems based on access events.

Simple Difference Between AUX IN and AUX OUT

AUX IN is used when the controller needs to receive information or signals from external devices. AUX OUT is used when the controller needs to send signals or commands to external devices.

In simple terms:

AUX IN = Input signal comes into the controller
AUX OUT = Output signal goes out from the controller

AUX OUT – NC, COM, and NO Terminals

In an access control controller, AUX OUT terminals are commonly provided with three relay connection points called NC (Normally Closed), COM (Common), and NO (Normally Open). These terminals work like an electronic switch that allows the controller to operate external devices such as alarms, buzzers, sirens, lights, automatic doors, or relays.
The COM terminal stands for Common. It is the main connection point of the relay. Depending on whether the relay is active or inactive, the COM terminal connects either to NC or NO. It acts as the center point for switching operations.
The NC terminal means Normally Closed. In normal condition, when the relay is not activated, NC remains connected to COM. This means current can flow between COM and NC during the default state. When the relay activates, the connection between COM and NC breaks automatically.
For example, if a buzzer is connected using COM and NC, the buzzer may remain powered during normal operation. When the controller activates the relay, the COM-NC connection disconnects and the buzzer turns OFF.
The NO terminal means Normally Open. In normal condition, NO remains disconnected from COM. No current flows between them until the relay activates. Once the relay becomes active, COM and NO connect together and complete the circuit.
For example, if a warning siren or alarm light is connected using COM and NO, it will normally remain OFF. When an alarm event occurs, the controller activates the relay, COM connects with NO, and the siren or light turns ON automatically.
In real access control systems, AUX OUT relay terminals are often used for alarm systems, emergency lights, automatic doors, fire alarm integration, or external security devices. The controller changes the relay condition based on events such as unauthorized access, door forced open, or door open too long warnings.

In simple terms:

COM = Common terminal
NC = Connected during normal condition
NO = Connected only when relay activates

If I short the two AUX1 Terminals, will the AUX OUT relay Willbe Triggered

Yes, if your controller is configured properly, then shorting the two AUX1 input terminals can trigger the AUX OUT relay.

If you short the two AUX1 terminals, the controller may detect it as an input trigger event. AUX1 is usually an auxiliary input terminal that receives signals from external devices such as switches, sensors, or alarm systems.
When the AUX1 terminals are shorted together, the controller recognizes this change in the input condition. Depending on the controller programming and software configuration, it can then perform different actions such as activating AUX OUT, unlocking doors, or triggering alarms.
If the controller is configured so that AUX1 controls AUX OUT, then shorting AUX1 will activate the AUX OUT relay. Once AUX OUT activates, the relay terminals such as COM and NO or COM and NC will change their connection state.
For example, suppose a siren is connected to AUX OUT using COM and NO terminals. When AUX1 is shorted, the controller activates AUX OUT, COM connects with NO, and the siren turns ON automatically.
However, this behavior is not automatic in every controller. The event action must usually be configured in the access control software or controller settings. If no action is assigned to AUX1, then shorting the terminals may not trigger AUX OUT at all.
Therefore, whether AUX OUT relay activates or not depends on the controller configuration and programming.

After shorting it, will all the doors open?

Whether all doors will open after shorting AUX1 depends entirely on how the access control controller is programmed and configured. AUX1 is usually an auxiliary input terminal, and the controller decides what action should happen when that input is triggered.
If AUX1 is configured as a global emergency input, such as a fire alarm input, then shorting the AUX1 terminals can cause all connected doors to unlock at the same time. This is commonly done in commercial buildings for emergency evacuation purposes.
For example, in a multi-floor office building, the fire alarm system may be connected to the AUX1 input of the access control controller. During a fire emergency, the fire panel triggers AUX1 by shorting the input. The controller then releases power to all EM locks, causing every secured door to unlock automatically so people can exit safely.
However, AUX1 can also be configured to control only a specific door or selected doors. In that case, triggering AUX1 will not affect the entire system.
For example, in a server room access system, AUX1 may be connected to a local emergency exit switch. When someone presses the switch and AUX1 is triggered, only the server room door unlocks while all other doors remain secure.
In some systems, AUX1 may not directly open doors at all. Instead, it may trigger AUX OUT relays, alarms, buzzers, or other automation functions depending on the controller settings.
Therefore, shorting AUX1 does not automatically mean all doors will open. The actual behavior depends on the controller programming, software configuration, and system design.

What is RS485

RS485 Terminal:

RS485 is a communication terminal used for transmitting data between multiple electronic devices. It is widely used in access control systems, industrial automation, attendance systems, CCTV control, and building management systems because it provides stable and reliable long-distance communication.
In access control systems, RS485 terminals are commonly used to connect devices such as fingerprint readers, RFID card readers, biometric machines, controllers, elevators, and attendance terminals. Through RS485 communication, all connected devices can exchange information with the main controller or management software.
An RS485 connection usually uses two communication lines called A(+) and B(-). Some systems may also use an additional GND (ground) connection. Data is transmitted through the voltage difference between the A and B wires, which helps reduce electrical noise and communication errors.
One of the biggest advantages of RS485 is that it supports long cable distances. Communication can work reliably up to approximately 1200 meters under proper conditions. It also allows multiple devices to share the same communication line, making it very useful in large buildings and industrial environments.
For example, in a multi-door access control system, several fingerprint readers may be connected to one controller using RS485 terminals. When a user scans a fingerprint, the reader sends the data through the RS485 communication line to the controller. The controller then verifies the user information and decides whether to unlock the EM lock door.
RS485 is very popular because it works reliably even in electrically noisy environments such as factories, server rooms, or large commercial buildings. Compared to normal communication methods, RS485 provides better signal stability and lower communication errors.
Proper wiring is very important in RS485 systems. The A(+) terminal of one device must connect to the A(+) terminal of the next device, and the B(-) terminal must connect to B(-). If the polarity is reversed, communication may fail completely. Twisted pair cables are commonly recommended for better communication quality and noise protection.
Overall, RS485 is mainly used for stable long-distance communication and networking between multiple security, automation, and control devices.

Adding Extra Controllers to a 4-Door Access Control System

Adding Extra Controllers :

If you already have a 4-door access control controller and you want to add two more controllers, you can expand the system by connecting them through RS485 communication or TCP/IP network depending on the device type.

RS485 Method:

In RS485 communication, all controllers are connected using a two-wire communication line (A+ and B−). The connection is made in a daisy-chain manner, meaning Controller 1 connects to Controller 2, and Controller 2 connects to Controller 3.
Each controller must be assigned a unique address or ID so that the system can identify them separately. For example, Controller 1 can be ID 1, Controller 2 can be ID 2, and Controller 3 can be ID 3.
Once connected, all controllers communicate through the same RS485 line and can be managed from a single software platform.

TCP/IP Method:

If the controllers support network communication, they can be added using a LAN network. Each controller is connected to a network switch using Ethernet cables.
After connection, each controller must be assigned a unique IP address. For example, 192.168.1.101 for Controller 1, 192.168.1.102 for Controller 2, and 192.168.1.103 for Controller 3.
All controllers are then added to the access control software through their IP addresses and managed centrally.

Configuration Requirements:

Each controller must have a unique ID or IP address to avoid conflict in the system. A proper power supply, usually 12V DC SMPS, should be used for stable operation. RS485 wiring must follow correct polarity (A to A and B to B) and should be properly terminated for long-distance communication.

Real Example:

In a building, one 4-door controller is already installed. Later, two more controllers are added for additional floors. All controllers are connected through RS485 or LAN and managed from a single computer software. This allows the security team to control all doors from one system.

Simple Idea:

Adding extra controllers does not merge them into one device. Instead, they are connected in a network so that all controllers work together under one centralized access control system.

Controller LOCK Terminal How it Works

Controller LOCK Terminal :

The LOCK terminal in an access control controller is a relay output used to control an EM lock or electric door lock. It works like an automatic electronic switch that turns the door lock ON or OFF based on user permission.
When the system is in normal state and no valid user is detected, the LOCK relay remains in its default position. Depending on the wiring (NC or NO), the EM lock stays powered or unpowered, keeping the door in a locked condition.
When a user presents a valid credential such as an RFID card, fingerprint, PIN, or face recognition, the controller verifies the data. If the user is authorized, the LOCK relay is activated for a short time.
During relay activation, the internal switching between COM, NC, and NO changes. This change either cuts power to the EM lock or supplies power, depending on the installation method. As a result, the door unlocks temporarily.
After the preset delay time (for example 5–10 seconds), the controller automatically deactivates the relay. The LOCK terminal returns to its normal state, and the EM lock becomes active again, locking the door.
For example, in an office entrance system, an employee scans a proximity card. The controller checks the ID and activates the LOCK relay. The EM lock releases for a few seconds so the employee can enter, and then it locks again automatically.
In simple terms, the LOCK terminal is the main output point of the controller that manages door locking and unlocking automatically based on user authentication.

What is Access Controller How Works

An access control controller is the main control unit of a door access system. It works like the brain of the system and manages all access decisions. The controller receives signals from devices such as RFID readers, fingerprint scanners, keypads, and exit buttons. After receiving the signal, it checks whether the user has permission to enter.
When a user swipes a card or scans a fingerprint, the reader sends the information to the controller. The controller compares the received data with the stored database or access rules. If the information is valid, the controller sends an output signal to unlock the door. If the information is not valid, the controller keeps the door locked.
The controller is responsible for controlling different devices connected to the access control system. It can manage EM locks, electric strike locks, card readers, biometric devices, exit switches, door sensors, and alarm systems. It also controls the door opening time and automatically locks the door again after a few seconds.
A controller contains several important terminals and communication ports. The power input terminal supplies power to the controller. Reader terminals are used for connecting RFID readers or biometric devices. Lock terminals such as COM, NO, and NC are used for connecting the locking system. Exit button terminals allow users to open the door from inside, while door sensor terminals monitor whether the door is open or closed.
Many controllers also support communication methods such as RS485 or TCP/IP. These communication ports allow the controller to connect with computers, software, or additional controllers. In large systems, multiple controllers can work together and be managed from a single software platform.
There are different types of controllers used in access control systems. A standalone controller works independently without requiring a computer or network connection. A network controller works with management software and allows centralized monitoring and control of multiple doors and users.
Controllers are also available in different door capacities. A 2-door controller can manage two doors, while a 4-door controller can manage four doors. If additional doors need to be added, another controller can be connected through RS485 or a network connection and managed from the same system.
In a complete access control system, the controller plays the most important role because it processes all access requests, controls the locks, and manages communication between all connected devices.

A controller is the main brain of an access control system.
It controls who can enter or exit a door.
It receives signals from card readers and fingerprint devices.
It checks user permission from the database.
It unlocks the door if access is allowed.
It keeps the door locked if access is denied.
It controls EM locks and electric strike locks.
It manages exit buttons and door sensors.
It supports communication through RS485 or TCP/IP.
It can work with access control software.
A controller can manage multiple doors.
Standalone controllers work without a computer.
Network controllers work with centralized software.
It automatically locks the door after a set time.
It is the core device of the access control system.

What is Access Controller Components

An access control controller contains several important components that work together to manage door access and security operations. Each component has a specific function in controlling devices, processing user data, and operating the locking system.
The power input terminal is used to supply electrical power to the controller board. It provides the required voltage for operating the controller and connected devices. Some controllers also support backup battery connections to continue working during power failures.
The processor or CPU is the main processing unit of the controller. It receives data from readers and sensors, processes access requests, checks permissions, and controls outputs such as door locks and alarms. It performs all logical operations inside the access control system.
Memory storage is used to store user information, card numbers, fingerprints, passwords, access schedules, and event logs. The controller uses this memory to verify users and maintain access records.
Reader terminals are used for connecting RFID card readers, fingerprint scanners, or keypad devices. These terminals receive data from input devices and transfer it to the controller for verification.
Lock output terminals are responsible for controlling door locks such as EM locks and electric strike locks. These outputs work through relay circuits that switch power to the locking device.
The COM, NO, and NC terminals are relay connection points used for different lock wiring methods. COM stands for Common, NO stands for Normally Open, and NC stands for Normally Closed. These terminals determine how the lock behaves during normal and activated conditions.
The relay module is an important internal component that acts like an electronic switch. It allows the controller to safely control higher-voltage locking devices by switching power on or off.
Exit button terminals are used for connecting push buttons installed inside the building. When the button is pressed, the controller unlocks the door to allow people to exit.
Door sensor terminals connect magnetic door sensors that monitor whether the door is open or closed. These sensors help detect forced entry, door left open conditions, or abnormal activity.
Alarm output terminals are used to connect sirens, buzzers, or alarm systems. The controller can activate alarms during unauthorized access attempts or system faults.
RS485 communication ports allow multiple controllers and devices to communicate over long distances. This communication method is commonly used in large access control systems.
TCP/IP network ports allow the controller to connect to a computer network. Through the network connection, administrators can manage users, monitor events, and control doors using software.
LED status indicators are used to display system conditions such as power status, communication activity, relay operation, and fault conditions. These indicators help technicians during installation and troubleshooting.
Input and output ports are used for connecting additional external devices such as sensors, alarms, intercom systems, or automation equipment.
The firmware or embedded software inside the controller controls all hardware operations and system functions. It manages authentication, communication, event recording, timing operations, and security rules.
All these components work together to make the access control controller the central management device of the entire access control system.

Short Quick Explain:

Power input terminal supplies power to the controller.
Processor (CPU) controls all controller operations.
Memory storage saves user data and access records.
Reader terminals connect RFID or biometric devices.
Lock output terminals control door locks.
COM terminal is the common relay connection point.
NO terminal remains open in normal condition.
NC terminal remains closed in normal condition.
Relay module switches lock power ON or OFF.
Exit button terminal connects the inside exit switch.
Door sensor terminal monitors door open or close status.
Alarm output terminal activates alarms or buzzers.
RS485 port enables communication between controllers.
TCP/IP port connects the controller to a network.
LED indicators show power and system status.
Input/output ports connect external security devices.
Backup battery terminal supports power failure operation.
Firmware controls system logic and access management.

Why Need Controler Connect To Management Software

An access control controller is required to connect access control hardware with management software because it acts as the central communication and processing device of the entire system. Without a controller, the software cannot directly communicate with door locks, readers, or sensors.
The controller works as a bridge between physical hardware devices and the access control software. Devices such as RFID readers, fingerprint scanners, exit buttons, and door sensors send signals to the controller first. The controller then processes the information and communicates with the software system.
When a user scans a card or fingerprint, the reader only captures the data. The reader itself usually cannot make access decisions. The captured information is sent to the controller, where the user data and access permissions are verified. After verification, the controller decides whether the door should unlock or remain locked.
The software is used for system management, while the controller performs real-time operations. The software can create users, assign access permissions, define schedules, monitor events, and generate reports. The controller receives these configurations from the software and applies them during operation.
Controllers also allow centralized management of multiple doors and multiple buildings. Through communication methods such as RS485 or TCP/IP, many controllers can connect to one software platform. This allows administrators to control all doors from a single computer.
Another important reason for using a controller is reliability. Even if the computer or software becomes disconnected, the controller can continue operating independently because it stores user information and access rules in its internal memory. This ensures that doors continue functioning during network or software failures.

The controller also records access events such as:

successful entry,
denied access,
door open alarms,
forced entry attempts,
and exit button usage.

These records are sent to the software for monitoring and reporting purposes.

In addition, the controller provides security and automation functions. It controls lock timing, alarm activation, anti-passback rules, door interlocking, and emergency operations. These functions cannot normally be handled directly by a reader or basic software alone.
In modern access control systems, the controller is therefore an essential device because it manages communication, decision-making, device control, security operations, and software integration in one centralized system.

A controller is needed to connect to management software because it acts as the communication bridge between the software and access control hardware devices. The software cannot directly control door locks, card readers, or sensors without a controller.
The controller receives data from RFID readers, fingerprint devices, exit buttons, and door sensors, then transfers this information to the management software. It also receives commands from the software and executes them in the physical access control system.
Management software is used to create users, assign access permissions, configure schedules, monitor doors, and generate reports. The controller stores these settings and applies them during real-time operation.
The controller allows centralized management of multiple doors and multiple controllers from a single software platform. Through RS485 or TCP/IP communication, administrators can remotely monitor and control the entire access control system.
Another important reason is system reliability. Even if the software or computer becomes offline, the controller can continue operating independently because it stores user data and access rules in its internal memory.
The controller also records access events such as successful entry, denied access, alarms, and door status changes, then sends these records to the management software for monitoring and reporting.
Without a controller, the management software cannot communicate with hardware devices, process access decisions, or control the locking system effectively.

A controller is needed to connect management software with access control devices.
It acts as a bridge between software and hardware.
It sends data between readers, locks, and software.
It executes software commands in real-time at the door.
It allows centralized control of multiple doors.
It stores and applies access rules from software.
It sends access logs and events to the software.
It enables remote monitoring and management.
It keeps the system working even if software is offline.
It makes communication between software and devices possible.

Management Software Example

In a real office access control system, a controller is used to connect management software with door devices like locks and readers.
First, the system admin uses access control software to create employee profiles, register RFID cards, and set access permissions for different doors and time schedules.
Then, all this information is sent from the software to the controller through a network or RS485 connection. The controller stores this data in its internal memory.
When an employee swipes a card at the door, the reader sends the card data to the controller. The controller checks the stored permission to verify whether the user is allowed to enter.
If the access is valid, the controller activates the relay output and unlocks the EM lock for a few seconds, allowing the door to open.
If the access is not valid, the controller denies the request and keeps the door locked.
After every attempt, the controller sends the access logs back to the management software, including entry time, user ID, and door information.
In this way, the controller continuously communicates between the physical door system and the software, making the whole access control system work properly.

Example: In an office, software stores employee cards and the controller unlocks the door when a valid card is swiped.
Example: In a company, controller opens the main door when authorized fingerprint is used and sends entry data to software.
Example: In a server room, software sets access rules and controller controls the lock during real-time entry.
Example: In a building, employee swipes card and controller checks permission then opens the door.
Example: Controller connects software and door so only approved users can enter.

Software Tasks in an Access Control System What can be done in access control software

In a real access control system, the management software is responsible for handling all user data and system configuration, while the controller executes those instructions at the door level. The software does not directly control locks or readers; instead, it manages everything through the controller.
One important task of the software is user creation and registration. The administrator creates employee profiles in the software, including name, ID number, department, and RFID card or fingerprint data. This information is then sent to the controller so that it can recognize authorized users.
Another key task is access permission management. The software allows the admin to decide which user can access which door and at what time. For example, an HR employee may have access only to HR and main entrance doors, while a security officer may have access to all doors. These rules are configured in the software and then synced with the controller.
The software also handles scheduling and time-based access control. It can set working hours, restrict entry during holidays, or allow 24/7 access for specific users. The controller follows these rules in real time when a card or fingerprint is scanned.
Event monitoring and logging is another major software task. Every time a door is accessed, the controller sends data back to the software, including user ID, time of entry, door number, and whether access was granted or denied. The software stores and displays this information for monitoring and reporting purposes.
The software is also used for attendance tracking. It collects entry and exit logs from the controller and generates attendance reports for employees. This helps HR departments manage working hours and punctuality.
In addition, the software performs remote management and system updates. Administrators can add or remove users, change permissions, or modify settings from a central computer without physically visiting each door. These changes are then sent to the controller.
The software can also perform security actions such as blocking users, activating alarms, or locking all doors in emergency situations. These commands are sent to the controller, which immediately applies them in the physical system.
In summary, the software acts as the central management platform that defines rules, manages users, monitors activity, and generates reports, while the controller executes these instructions in real time at the door level.

Short Description:

Access control software is used to manage users and their access rights in a security system. It allows administrators to add or remove users, register cards or fingerprints, and assign which doors they can access. The software also monitors all entry and exit activities in real time and stores logs for reports. It can set time schedules, control multiple doors from one place, and send commands to controllers for locking or unlocking doors

Example: Software adds an employee card and sends access permission to the controller.
Example: Software assigns door access rights to a user in a building system.
Example: Software blocks a user and updates the controller immediately.
Example: Software shows real-time entry and exit logs from doors.
Example: Software sets time schedule for door access control.

Key Features of Access Control Software

User management and access control
Door permission assignment
Real-time monitoring of entry and exit
Access schedule and time control
Event logging and reporting
Remote door locking and unlocking
Controller device management
Alarm and security alerts
Attendance tracking system
Multi-door system control
Multi-factor authentication (MFA): Supports RFID, PIN, biometric, QR, or mobile-based identity verification for secure entry.
Role-based access control (RBAC): Assigns access permissions based on user roles like admin, employee, or visitor.
Door access scheduling: Allows setting specific time slots when users can enter or exit secured areas.
Real-time monitoring: Tracks live entry/exit activity and shows who accessed which door and when.
Access logs & audit trail: Maintains a complete history of all access attempts for security and compliance.
Remote management: Enables administrators to control doors and permissions from web or mobile apps.
Visitor management: Registers and controls temporary access for guests with time-limited permissions.
Alarm & intrusion alerts: Triggers alerts for unauthorized access or forced entry attempts.
Anti-passback control: Prevents users from sharing access cards or reusing entry without proper exit.
System integration: Connects with CCTV, fire alarms, HR systems, and building management systems.
Multi-door & multi-site control: Manages multiple doors and locations from a single centralized platform.
Offline access mode: Ensures doors continue working even if the network is down.

Type of Access Control System software

Standalone Software

Standalone software works on a single computer without a network connection. It is used in small systems where only a few doors are controlled and all data is stored locally.

Client-Server Software

Client-server software uses a central server to store data and multiple client computers to manage the system. It is suitable for medium to large organizations.

Web-Based Software

Web-based software runs in a browser and can be accessed from any device with internet access. It is commonly used for remote and multi-branch management.

Cloud-Based Software

Cloud-based software is hosted on online servers and allows access from anywhere. It provides automatic updates, backup, and easy scalability for large systems.

Desktop Application Software

This software is installed on a computer and used for local monitoring and management of access control systems through a graphical interface.

Mobile Application Software

Mobile apps allow users to monitor and control the system using smartphones. It helps security staff receive alerts and manage access remotely.

On-Premise Software

On-premise software is installed within the organization’s own server infrastructure. It provides high security and full control over data but needs internal IT maintenance.

Network-Based Software

Network-based software connects multiple controllers over LAN or WAN. It is used in large buildings, factories, and campuses for centralized control.

Hybrid Software

Hybrid software combines local system control with cloud access. It allows the system to work offline while also supporting remote management.

Standalone software works on a single computer without network.
Client-server software uses central server with multiple clients.
Web-based software runs in a browser over internet.
Cloud-based software is hosted online for remote access.
Desktop software is installed on a local PC.
Mobile software works on smartphones for remote control.
On-premise software is hosted in organization’s own server.
Network-based software connects multiple devices over LAN/WAN.
Hybrid software combines local and cloud features.
Embedded software runs directly inside the controller device.

Access Control System Brands

1. Matrix Comsec (India)

Matrix is one of the top Indian security companies based in Gujarat.
It provides biometric access control, door controllers, attendance systems, and enterprise security software. It is widely used in corporate offices, factories, and government buildings.

2. eSSL Security (India)

eSSL is a very popular biometric brand in India.
It offers fingerprint machines, face recognition systems, RFID readers, and access control devices. It has a strong dealer network across India and is widely used in small and medium businesses.

3. ZKTeco (Strong India presence)

ZKTeco is a global brand but extremely popular in India.
It provides face recognition, fingerprint systems, RFID access control, and smart door controllers. It is widely used in offices, industries, and schools due to its affordability and wide range.

4. Suprema (Available in India)

Suprema is a premium global biometric brand used in India.
It is known for advanced face recognition and high-security access control systems used in enterprise environments.

5. Honeywell Security (India)

Honeywell offers integrated building security systems including access control, alarms, and surveillance systems.
It is used in large commercial buildings and industrial projects.

What is Interlocking System – Features (Access Control)

Two-door control logic: Ensures Door A and Door B cannot open at the same time
Single-person entry control: Only one authorized person can enter at a time
Automatic door sequencing: One door opens only after the other is fully closed
Anti-tailgating protection: Prevents unauthorized people from following inside
Secure chamber system (mantrap): Creates a controlled buffer zone between two doors
Authentication support: Works with RFID card, fingerprint, PIN, or face recognition
Door status monitoring: Shows real-time open/close/lock status of both doors
Controller-based control: Managed through access control panel or software
Alarm system integration: Triggers alarm for forced entry or invalid access attempts
Emergency override: Allows authorized emergency unlock in critical situations
Access log recording: Stores entry/exit events for security tracking
Fail-safe / fail-secure option: Doors can be configured for power failure conditions
Integration with security systems: Can connect with CCTV, fire alarm, and building security

What is Anti-Passback – Features (Access Control)

1. Definition:
Anti-passback is a security feature in access control systems that prevents a user from entering a secured area again without first exiting properly. It is designed to stop misuse of access cards and improve security accuracy.

2. Working Principle:
When a user enters a door using RFID card, fingerprint, or face recognition, the system marks that user as “inside.” The same user cannot use the same credential again for entry until the system records a valid exit from an exit reader.

3. Purpose:
The main purpose of anti-passback is to prevent card sharing, duplicate entry attempts, and unauthorized access. It ensures that each entry has a corresponding exit, maintaining correct movement tracking.

4. Security Benefit:
This feature increases security by stopping users from giving their card to another person or trying to re-enter without permission. It also helps security teams detect suspicious access behavior.

5. Types:
Anti-passback can be hard (strict blocking of access), soft (allows access but logs violation), or timed (resets after a specific time period).

6. Application Areas:
It is commonly used in corporate offices, factories, data centers, government buildings, and any place where strict entry and exit control is required.

7. Summary:
In simple terms, anti-passback ensures that a user must exit before they can enter again, making the access control system more secure and reliable.

Anti-Passback – Real Example:

1. Office Entry Example:
In a company office, an employee enters the building at 9:00 AM using an RFID card or fingerprint. The access control system records the user as “INSIDE” in the database.

2. Misuse Attempt:
After entering, the employee gives his access card to another person. When the second person tries to enter using the same card, the system detects that the user is already inside.

3. System Response:
The access control system immediately blocks the entry request. This happens because anti-passback rules do not allow the same credential to be used for entry again without a proper exit.

4. Exit Scenario:
Later, when the original employee exits the office using the exit reader, the system updates the status from “INSIDE” to “OUTSIDE.” After this update, the user is allowed to enter again normally.

5. Factory Example:
In a factory, workers must scan their fingerprint when entering and exiting. If a worker tries to enter twice without exiting, the system denies access, ensuring correct attendance and preventing card sharing.

6. Summary:
In real life, anti-passback ensures that a person must properly exit before entering again, preventing misuse of access cards and improving security accuracy.

What is DFO (Door Forced Open)

1. Definition:
DFO stands for Door Forced Open in an access control system. It is an alarm condition that occurs when a secured door is opened without receiving a valid authorization signal from the controller.

2. How it Happens:
DFO occurs when a door is opened by force or without proper authentication, such as RFID card, fingerprint, PIN, or face recognition. It usually happens when someone breaks, pushes, or bypasses the lock system.

3. System Detection:
The access control system continuously monitors the door sensor. If the door status changes from closed to open without a valid access command, the system immediately identifies it as a forced entry.

4. Alarm Response:
When a DFO event is detected, the system triggers an alarm such as a buzzer, siren, or software alert. It may also send notifications to security staff through monitoring software, SMS, or email in advanced systems.

5. Purpose of DFO Feature:
The main purpose of DFO is to protect secure areas by detecting unauthorized entry attempts. It helps prevent theft, intrusion, and security breaches by giving instant alerts.

6. Real-Life Example:
In an office building, if someone opens a locked door without scanning their access card or fingerprint, the system detects it as a forced opening and immediately triggers a DFO alarm.

7. Summary:
In simple terms, DFO means a door has been opened without permission, and the system treats it as a security violation and generates an alert.

DFO (Door Forced Open) – Real Example

1. Office Main Door Example:
In an office building, the main door is controlled by an access control system with a magnetic door sensor and electric lock. An employee must scan an RFID card or fingerprint to unlock the door.

2. Normal Entry Case:
When an employee scans the card, the controller unlocks the door and the magnetic sensor confirms the door is opened with permission. No alarm is generated.

3. Forced Entry Case:
At night, someone tries to enter the office by forcing the door open without scanning any card or fingerprint. The magnetic door sensor detects that the door has opened without authorization.

4. DFO Alarm Trigger:
Since the controller did not send any unlock signal, the system recognizes this as a Door Forced Open (DFO) event. Immediately, a loud alarm or buzzer is activated, and the event is logged in the system.

5. Security Response:
Security staff receives an alert on the monitoring software or mobile app. CCTV recording may also be triggered automatically for investigation.

6. Summary:
In real life, DFO happens when a secured door is opened without permission, and the magnetic door sensor detects it and triggers a security alarm.

What is Door Open Too Long

1. Definition:
Door Open Too Long is a condition in an access control system where a door remains open longer than the allowed time configured in the controller or software. It is also known as Door Held Open (DHO/DHF).

2. How it Works:
When a user opens the door using authorized access such as RFID card, fingerprint, or PIN, the controller unlocks the door for a limited time. The system expects the door to close within that preset duration.

3. Detection Process:
A magnetic door contact sensor continuously monitors the door status. If the sensor detects that the door is still open after the allowed time expires, the controller identifies it as a Door Open Too Long event.

4. System Response:
Once the condition is detected, the access control system may trigger a buzzer, alarm, or software notification. The event is also stored in the system logs for monitoring and security review.

5. Purpose of Feature:
This feature helps improve security by ensuring that secured doors are not accidentally left open. It prevents unauthorized access and protects restricted areas from security risks.

6. Real-Life Example:
In an office, an employee enters using an RFID card but forgets to close the door properly. After the configured delay time, such as 10 seconds, the controller detects the open door and generates a Door Open Too Long alarm.

7. Summary:
In simple terms, Door Open Too Long means a door was opened normally but stayed open beyond the permitted time, causing the system to generate a security alert.

What is Door Contact Sensor (Magnetic Sensor)

1. Introduction

A Door Contact Sensor, also known as a Magnetic Door Sensor or Reed Switch Sensor, is a basic but very important device used in access control and security systems. Its main function is to detect whether a door is open or closed and send this information to the controller system.

2. Structure of Sensor

This sensor consists of two main parts: a magnet and a sensor unit. The magnet is installed on the moving part of the door, while the sensor unit is fixed on the door frame. Both parts are aligned so they can work together when the door is closed.

3. Working Principle

The sensor works using a magnetic field. When the door is closed, the magnet stays close to the sensor and maintains the magnetic connection. When the door opens, the magnet moves away, breaking the magnetic field and changing the sensor’s state.

4. Signal Transmission

When the magnetic state changes, the sensor sends an electrical signal to the access control controller. The controller continuously monitors this signal to understand whether the door is in an open or closed condition.

5. Role in Security System

The sensor plays a very important role in security monitoring. It helps detect normal door access, unauthorized entry attempts, door forced open (DFO), and door held open (DHF) conditions. It ensures proper monitoring of all door activities.

6. Real-Life Application

In an office access control system, when a user opens the door using a valid RFID card or fingerprint, the system considers it a normal event. But if the door is opened without authorization, the sensor detects it and triggers a security alarm.

7. Importance in Access Control

Without a door contact sensor, the system cannot properly track door status. It is essential for ensuring security, generating alarms, and maintaining accurate access logs in modern security systems.

8. Conclusion

A Door Contact (Magnetic) Sensor is a simple but powerful device that detects door open and close status using magnetic interaction and sends signals to the controller for security monitoring and control.

How to Integrate Access Control with Fire Alarms

1. Introduction:
Access control and fire alarm integration is an important safety feature used in modern buildings. It connects the access control system with the fire alarm system so that doors can automatically unlock during emergencies such as fire or smoke detection.

2. Basic Working Process:
Under normal conditions, access control systems keep doors locked using magnetic locks or electric strikes. When the fire alarm system detects smoke, heat, or fire, it sends an emergency signal to the access control controller.

3. Signal Communication:
The fire alarm panel usually communicates with the access control system through relay outputs or dry contact connections. When the alarm activates, the relay changes state and sends an unlock command to the controller.

4. Door Unlock Operation:
After receiving the fire alarm signal, the access control controller immediately cuts power to fail-safe magnetic locks or activates emergency unlock logic. As a result, secured doors automatically unlock for evacuation.

5. Summary:
In simple terms, access control and fire alarm integration allows secured doors to unlock automatically during a fire emergency by connecting the fire alarm panel with the access control controller.

Access Control & Fire Alarm Integration – Real Example

1. Office Building Setup:
A corporate office uses an access control system with RFID card readers and magnetic locks on the main entrance and server room doors. Employees need authorized access cards to enter these secured areas.

2. Normal Working Condition:
During regular operation, the magnetic locks remain powered and locked. Employees scan their RFID cards to unlock the doors and enter the office or server room.

3. Fire Emergency Situation:
One day, smoke is detected in the electrical room by the fire alarm smoke detector. The fire alarm panel immediately activates the emergency alarm system.

4. Fire Alarm Signal to Access Control:
The fire alarm panel sends a relay signal to the access control controller. The controller recognizes the emergency condition and activates the fire integration function.

5. Door Unlock Process:
The controller cuts power to all fail-safe magnetic locks connected to emergency exit doors. As a result, the doors automatically unlock without requiring RFID cards or fingerprints.

6. Employee Evacuation:
Employees can quickly open the doors and safely evacuate the building. Security staff also receive alarm notifications through monitoring software.

7. After Emergency Reset:
Once the fire alarm is cleared and reset by authorized personnel, the access control system returns to normal operation and the doors become secured again.

8. Summary:
In real life, fire alarm integration allows access control doors to unlock automatically during emergencies, ensuring fast evacuation and improving building safety.

Fire Alarm NC / NO / COM Connection with Access Controller (Paragraph-wise)

1. Introduction:
A fire alarm panel has relay terminals called NC (Normally Closed), NO (Normally Open), and COM (Common). These terminals are used to send a fire signal to an access control controller for emergency door control.

2. Connection Method:
To integrate with an access control system, the fire panel relay is connected to the controller input terminals. The most common connection is:

COM → Controller GND / COM
NC → Controller FIRE IN / AUX IN / ALARM IN

This is called a dry contact input connection.

3. Normal Condition (No Fire):
In normal condition, the relay keeps COM and NC connected. In this state, no fire signal is sent to the access controller, and all doors remain locked as usual using RFID, fingerprint, or PIN authentication.

4. Fire Alarm Condition:
When a fire is detected, the fire panel activates its relay. The relay changes state and COM disconnects from NC (and connects to NO). This change sends a signal to the access control controller input.

5. Controller Response:
The access control controller detects the signal on the FIRE IN / AUX IN terminal and understands that a fire emergency has occurred. Based on its programming, it immediately activates emergency logic.

AUX Input in Access Control (Fire Integration)

1. Introduction:
AUX INPUT (Auxiliary Input) in an access control controller is an extra input terminal used to receive external signals from devices like fire alarm panels, smoke detectors, or emergency buttons. It helps the system react to emergency conditions.

2. Purpose of AUX Input:
The main purpose of AUX INPUT is to detect external alarm signals. In fire integration systems, it is used to receive the fire alarm signal from the fire panel so that the controller can take emergency actions.

3. Connection with Fire Alarm Panel:
The fire alarm panel relay (COM and NC/NO) is connected to the access control controller AUX INPUT terminal. When the fire alarm activates, the relay changes state and sends a signal to the controller.

4. Signal Function:
In normal condition, the AUX INPUT remains inactive. When the fire alarm triggers, the input becomes active (ON state), and the controller detects this as an emergency fire condition.

5. Rule Creation in Controller:
Yes, a rule must be created in the controller software. The rule defines what action should happen when AUX INPUT becomes active. For example, the rule may be set as “If AUX INPUT = Fire Alarm, then unlock all doors.”

6. Controller Action:
Once the AUX INPUT is triggered, the controller executes the programmed action. It can unlock doors, cut power to magnetic locks, or activate alarm outputs depending on configuration.

7. Real-Life Example:
In an office building, the fire alarm panel is connected to the controller AUX INPUT using COM and NC terminals. When a fire occurs, the signal activates the AUX INPUT, and the controller automatically unlocks all emergency exit doors for safe evacuation.

8. Summary:
In simple terms, AUX INPUT is a signal input terminal in the access control controller that receives fire alarm signals. A rule must be configured so that when fire is detected, the system automatically unlocks doors for safety.

DS-K2621X

Supports IPv4, IPv6 and DHCP
Supports AES256, RSA2048, and TLS 1.2 encryption protocols
Web configuration management. All configurations can be realized via web without software application
Supports professional access control applications such as multi-door interlocking and anti-passback
Supports backup battery access
Supports OSDP, and a variety of wiegend formats to connect to third-party card readers
It has status indicators such as power supply, communication and operation, which is convenient for equipment health detection
Supports 1-door control

Data-Sheet

User Manual

DS-K2604-G

100,000 cards and 300,000 events storage
Communication via TCP/TP, ISUP5.0 and RS-485
ISAPI, OSDP supported
4 doors access control
Alarm input/output and alarm event upload
RS-485 interface and Wiegand interface for accessing card reader
UL294 Standard Qualified
Supports battery access

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