Tailgate Detection - Basic Tailgate Detection System

Basic Tailgate Detection System
Model TG-L Series

CARD-IN / FREE-EXIT OPERATION
This application uses one Local Door Alarm (TG-LDA) circuit board with the internal Tailgate monitoring program, and one or two sets of Doorway Mounted
Sensors to monitor a card reader controlled door and to determine and
annunciate unauthorized passage through the door. Standard card reader system inputs and outputs are utilized by the TG-LDA.

STANDARD SYSTEM INTERFACE
The lock output is monitored by the TG-L to determine when a valid card has been presented. The lock may be fail-safe or fail secure. The lock output must be configured for automatic re-lock when the door is opened. The normally closed-door contact is monitored directly by the TG-L. The normally closed-door mimic relay (DMR) is monitored by the card reader system. The normally closed alarm relay is monitored by the card reader system.

OPERATION

NORMAL ENTRY USING CARD READER
The DMR opens when the door is unlocked and opened, and closes when a person passes through the doorway. This relay cycle is expected by the card reader system and an authorized passage is registered in the card reader database.

TAILGATE ALARM
If a person walks through the doorway in the entry direction without presenting a valid card, the DMR opens again and the card reader system interprets that action as a forced door and an alarm is registered in the card reader database. The TG-L circuit activates the local sounder so that the alarm is annunciated at the door. The normally closed alarm relay opens. The alarm is reset after about 4 seconds.

FREE EXIT
When a person walks through the doorway in the exit direction no alarm is generated.

TECHNICAL SPECIFICATIONS

Power 12 VDC @ 250 ma max.

Inputs 1 lock control relay from card reader system.
Lock may be fail-safe or fail secure.
Doorway mounted sensor pair(s)

Outputs	1 normally closed Door Mimic Relay (DMR) 1 normally closed Alarm Relay Alarm sounder @ 85dB Green LED indicates entry access enabled Red LED indicates secured mode - entry will generate an alarm
Field Adjustments	Tailgate Sensitivity Adjustment - sets the sensitivity of the tailgate detection software.
Mounting	Doorway Mounted Sensors are attached to the doorframe with self-tapping screws. Contact Kouba Systems for other mounting options. LDA circuit board is mounted next to the card reader interface module, either in a make-up box or in the equipment room where the card reader system is located. Sounder and LED Trim Plate may be mounted at the door mullion, 1 gang box near the door, or in the ceiling above the door. A free-standing post is available where a doorway mounted unit is not desirable.
Dimensions	LDA circuit board module - 1.65” W x 2.5” L x 1.75” D Doorway Mounted Sensor Housing, Single Beam - 12” L x 2.25” W x 1.375” D Doorway Mounted Sensor Housing, Dual Beam - 24” L x 2.25” W x 1.375” D Free-Standing Post - 2 x 3 x 30 in. (post) - 12 x 12 x 3 in. (footing)

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