Technical Manual

Technical Manual AM Systems

Connections v4.4 Page 34 of 72

6.12 The visitor counter

The AM models can be equipped with a visitor counter. This counter allows counting of

visitors as well as determining the movement direction of a person who generated an

alarm.

Both TRX and RX antennas can therefore be equipped with a visitor counter PCB. The

TRX antenna holds the RX visitor counter PCB (IR-RX) and the RX antenna holds the TX

visitor counter PCB (IR-TX).

Figure 18 shows the visitor counter principle.

Figure 18: Top view of the visitor counter principle

The IR LED on side B of the RX antenna transmits an infra-red signal, which is received

by both IR receivers on side A of the TRX. When the infra-red signal is interrupted by a

person walking in (incoming), first IR-RX1 will receive no signal and then IR-RX2 will

receive no signal. In this way the visitor counter registers the movement direction. The

same principle is used for outgoing persons.

As shown in the above figure, each visitor counter PCB has an A and B side. The

transmitter IR-LED’s and the IR receivers can be switched on or off per side. This is

necessary for each first and last antenna in a row. For example, if the system in the

above figure consists just of two antennas, then the visitor counter side B of the

transceiver antenna and side A of the receiver antenna must be switched off. The Device

Explorer software will automatically activate the visitor counters dependent of the antenna

lay-out.

It is possible to increase the intensity of the IR-LED’s. This can be useful in bright and

sunny environments, to ensure proper functioning of the visitor counter.

For the visitor counter to operate properly the minimum distance between the transceiver

and receiver is 0.5m. The maximum distance is 3m (per aisle).

visitor counter PCB (IR-TX)

visitor counter PCB (IR-RX)

IR LED’s

IR Receivers

Side B

Side A

Incoming

IR-RX1

IR-RX2

Outgoing