Renesas FLASH Development Toolkit 3.07 Instruction Manual download pdf (Page 26)

Designing and Planning an M2150 System

Access Control Design Guide

Planning Antipassback

Note: You need to read this section only if the site requires antipassback rules. Installation and planning is

made easier if antipassback is not required.

If antipassback is required, consider the type of antipassback required: zonal or timed. Timed is easier to

set up, but is not quite as secure as zonal. Timed antipassback is normally used to control antipassback

around the periphery of a single area, whereas zonal antipassback can have nested antipassback areas.

Each antipassback reader must be nominated as either a hard antipassback reader or a soft antipassback

reader. The only difference is that a hard antipassback reader logs an antipassback violation as an alarm

or event and does not grant access, whereas a soft antipassback reader logs an alarm or event, but does

grant access.

In order for antipassback to be totally effective, it should be used in conjunction with a turnstile (rather than

an ordinary door) to ensure that only one person at a time can enter.

Timed Antipassback

The principle of timed antipassback is simple: once a card has been used at a timed antipassback reader,

the card causes an antipassback violation if it is used again at the same or another timed antipassback

reader within a predefined period of time. The exception to this rule is when the antipassback reader has

been defined to be for an exit route. In this case, the card can be used at any time without causing an

alarm or event. This allows for situations where a person enters an antipassback-protected area, then

wishes to exit and re-enter the area quickly.

If timed antipassback is required, specify the required passback timeout period in the range 0 to 63

minutes (zero for an exit reader).

A timed antipassback scheme cannot include readers controlled by different database units; readers

controlled by separate database units are in separate schemes.

Zonal Antipassback

In the case of zonal antipassback, the building needs to be partitioned into zones (Figure 2-2). For

example, zone 1 may be the main lobby, zone 2 the computer room, etc.

Figure 2-2: A Possible Zone Arrangement for Zonal Antipassback

For each reader that is defined as a zonal antipassback reader, you can specify which zone of the building

the card is going from and which zone it is going to. For example, the reader may allow a card to go from

zone 1 (e.g. main lobby) to zone 2 (e.g. computer room).

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Renesas FLASH Development Toolkit 3.07 Instruction Manual Page 26