Tag
An electronic device (contactless) that can communicate with a reader by means of a radio frequency signal.

Tailgating
Following an authorized and credentialed person through an access control point without having or using a separate valid credential.  

Template
a mathematical representation of biometric data. A template can vary in size from 9 bytes for hand geometry to several thousand bytes for facial recognition.

Threshold
A predefined number, often controlled by a biometric system administrator, which establishes the degree of correlation necessary for a comparison to be deemed a match.

Time & Attendance

The Time Attendance Mode is used to record the Clock In / Clock Out time of the employees, and it is very useful to avoid the buddy-punching problem. The major difference is that in this mode, the device is not used to control the door strike, and there is no time & terminal restriction.

Transaction
"A business or payment event for the exchange of value for goods and services". Any event that occurs on a PAC for Windows system is called a transaction. All transactions which originate from a door controller are reported to the PC, and stored on the hard disk for later analysis. In addition, the PAC for Windows system then decides the fate of each transaction - display on screen, printer, generate an alarm, etc.

Turnstile
A physical barrier device used to manage pedestrian traffic flow and access control at a security checkpoint.

TXD
Transmit Data. An RS-232 output that sends data to a receiving device. This output must be connected to the RXD input of the receiving device.