When the user goes out, he must have a record of the entrance, otherwise, he cannot open the door.
Anti PassBack Access Control – Sometimes, some illegal person follows the employee into the gate, which will bring security problems. To prevent such risk, this function is enabled. In record must match our record, or the gate won’t be open.
This function needs two machines to work together. One is installed inside the door (master machine hereinafter), and the other is installed outside the door (slave machine hereinafter). Wiegand signal communication is adopted between the two machines.
The main purpose of an anti–passback system is to prevent a cardholder from passing their card back to a second person to gain entry into the same controlled area; for example a Car Park. It also improves the accuracy of roll calls, and ‘Last known position’ reports and deters tailgating.
Anti PassBack Access Control
WORKING PRINCIPLE
The master machine has Wiegand In and the slave machine has Wiegand Out. Connect Wiegand Out of slave machine to Wiegand In of master machine. Wiegand output from slave machine must not own machine ID. The number sent to the master machine from the slave machine must be found in the master machine.
FUNCTION
Judge whether it is anti-pass back according to the user’s recent in-out record. In-record and out-record must be matched. This machine supports out, in, or out-in anti-pass back (enter machine menu—setting—system setting—advanced setting—anti-passback).
When a master machine is set as “out anti-passback”, if a user wants to come in and go out normally, his recent record must be “in”, or he cannot go out. Any “out” record will be “anti-passback refused”. For example, if a user’s recent record is “in”, and his second record can be “out” or “in”. His third record is based on his second record. The out record and in the record must match. （Notice: if the customer has no record before, then he can come in but cannot go out.
When the master machine is set as “in anti-passback”, if the user wants to come in and go out normally, his recent record must be “out”, or he cannot go out. Any out record will be “anti-passback refused” by the system. (Notice: if the customer has no former record, then he can go out, but cannot come in.）
When the master machine is set as “out-in anti-passback”, if the user wants to come in and go out normally, if his recent record is “out” and “in”, then his next record must be “in” and “out”.
OPERATION
1) Select Model
Master machine: Machine with Wiegand in function, except for F10 Reader. Slave machine: Machine with Wiegand Out function.
2) Menu Setting
Anti-Passback Access Control
Out anti-passback: If the device does not store the record of a person, the person can check out after the first comparison.
In case a person’s record has been stored in the device, an alarm will be raised when the person checks out without the corresponding entry record in the device. If only our anti-passback is enabled, entry is allowed at any time.
In anti-passback: If the device does not store the record of a person, the person can check in after the first comparison. In case a person’s record has been stored in the device, an alarm will be raised when the person checks in without the corresponding exit record in the device. If only anti-passback is enabled, exit is allowed at any time.
In/out anti-passback: If the device does not store the record of a person, the person can check in and out after the first comparison. In case a person’s record has been stored in the device, an alarm will be raised when the person checks in or out without a corresponding exit or entry record in the device.
No anti-passback: The door will be opened only when a person is authenticated by the master host.
DEVICE STATUS
Entry Control: When a device is used to control entry, the device saves only the entry records.
Exit Control: When a device is used to control exit, the device saves only the exit records.
None: When the status of a device is set to None, the anti-passback function is disabled on the device.
3) Modify Device’s Wiegand Output Format
When the two devices are communicating, only Wiegand signals without device ID are received. Enter device menu－>communication option－>Wiegand option or enter software-〉basic setting-〉device management-〉Wiegand, to modify “defined format” as “wiegand26 without device ID”.
4) Enroll the User
The user must be on the master machine and slave machine at the same time, and the user PIN must be the same. Therefore, it is necessary to enroll the user on the master machine and slave machine at the same time.
5) Connection Instruction
Wiegand communication is adopted for the master machines and slave machines. Refer to the following for connection::
Master Slave
IND0 <—–> WD0
IND1 <—–> WD1
GND <—–> GND
R.Nandakumar-ATSS
Detecting Unauthorized Entry by Tailgating in Real Time