Fluke Process Instruments

This quick guide is intended to assist installers with wiring connections to the Vector 4D Time of Flight people counter when used in conjunction with an access control system for the purposes of Tailgating detection.

Pre-Requisites

Only PoE enabled, Vector 4D ‘Analytic’ variants can be used for Tailgate detection. Non-PoE variants, or the Vector ‘Count’ variant, cannot be used for Tailgate applications.

The Irisys USB-IO module (IWC6203) is also required for the vast majority of Tailgate detection functionality. This transmits the various signals from the access control system to the Vector, and vice versa, via relay pulses. Unless the alternative method of MQTT is used.

Working knowledge of the interfacing requirements of your particular access control system is also necessary.

Access Controller Requirements

In 99% of Tailgate detection applications, the access control system must be capable of providing a relay pulse output for each valid swipe card. I.e. for every person allowed through the secure door, a relay pulse must be output. This output is then provided to the Vector input so that it knows a valid person is walking through, and so will not generate an alarm. 

Additionally the access control system must be able to accept the Vectors alarm output pulse as in input to drive other systems - i.e. an alarm or whatever you need it to do on detecting a Tailgate event.

Vector Connections

The Vector is a modern IoT device and requires a PoE network connection for both power and the initial (and any subsequent) configuration:

The optional connection to a local Wi-Fi router will provide ongoing wireless configuration capabilities without the requirement for access to the customers’ network.

Alternatively, if a connection to the customers network is accessible, an internet connection will provide the same configuration options, remotely.

If connection to the customers network is not possible, but remote setup and validation is still required, a locally connected 3G/4G/LTE router can be used to provide a separate internet connection instead.

USB-IO Module (IWC6203) Connections

This module provides the interface between the Vector device and the Access Control system.

The access control system must send a signal to the Vector, via this module, to indicate how many people are allowed to pass through the secure door – effectively this is a relay pulse for each person.

The Vector will then send a relay pulse back, again via this module, if that number has been exceeded. On receiving that pulse, the access control system should use it to trigger other events – sound a buzzer, lock a subsequent door, trigger a period of CCTV recording, etc.

The relay pulse from the access control system to indicate the number of people allowed is usually taken from the ‘valid card signal’ already present in most systems. In this way, once the door is unlocked and open, and as long as each person presents a valid card, they can continue walking though the secure door and entry will not be impeded. Only when a person enters without presenting a valid card will they trigger the tailgate alarm output.

The IO module connects to the Vector 4D Analytic via a short USB cable and is intended to be secured inside the end of the Vector case or in the ceiling cavity. A longer USB cable can be used (max 5m), if required.

Connections to the module are made by inserting the bare signal wires from the access control system into the screwless terminals while holding down the securing tabs (with a small screwdriver, or similar). Upon release, the wire will then be clamped in place.

Only three connections are required - a common ground connection, a signal from the access control system and a corresponding output signal back to the access control system. Whilst two inputs and two outputs are available, Input 1 and Output 1 are shown in this example. (Note also, the wiring label on the reverse of each IO module):

The outputs are referenced to ground and are ‘open drain’ type. The voltage applied must be in the range 0V to 28V and each output can sink 300mA max. See the USB-IO module documentation for more details.

It is the installers responsibility to ensure correctly connectivity between the IO module and the access control system. Always consult your access control systems installation manual for input and output specifications and requirements.

Alternative Signaling Methods

Instead of using the USB IO modules input and output signaling lines, it may be possible on very modern access control systems to use a real-time IP enabled signaling method called MQTT. If your access control system is MQTT compatible and you want to use this instead, contact Irisys support for alternative instructions.