User's Manual

Chapter 2: Architectural overview

2 – 5

Notes

The diagram uses the following issue code look ahead values:

Also instructive is to see what happens when the issue code

has reached its limit. Let’s look at another diagram to see

what happens in this case. The issue code look ahead values

remain the same.

Figure 2.2 Guest functionality diagrammed

Look ahead

function

Value

Offset 1

Range 3

Number of issue

code digits

Lost card Newly

encoded

card

Issue codes

Auto

update

offset

of 1

range

of 3

valid

issue

codes

new offset

new

range

lost card

does not work

B.A.S.I.S. G Lock Same B.A.S.I.S. G Lock

after use of the 1001

issue code 01 card

Issue codes

1001 issue code: 00

1001 issue code: 01