User Guide

Part 8
OPERATION GUIDE
E-M TYPE FINGER PRINT SENSOR
The Posiflex E-M type finger print sensor has been tested to operate well
on reading finger prints of various skin conditions, it is still advisable to keep
the scanning area clean. To have a successful scanning, the finger must be
placed in a way that the core of the finger print is within the scanning area
(and best be in the center of the area), the finger should align with the sensing
pad within a tolerance of +/- 15º and the finger must get in touch with the
drive ring around the scanning area. Place the finger down flat, lightly but
firmly on the sensor. Do not roll the finger as you might in a traditional ink-
and-paper finger print taking. Keep the finger flat and motionless against the
sensor detection surface for a couple of seconds during the imaging process.
It is most advisable in real practice to register (enroll) for each ID more
than 1 finger and even better to register fingers from both hands into the
system. In this way, the identification procedure can less likely be obstructed
even in case of accidental injury. Please note that the finger print sensor is not
suitable for taking the finger print image of an infant.
Please refer to the readme files in the software installation for further
detail or consult our web site http://www.posiflex.com.tw
OPTICAL TYPE FINGER PRINT SENSOR
a. Cautions
1. Never pour the glass cleaner directly on the sensor window
2. Never use alcohol-based cleaners
3. Never submerge the sensor in liquid
4. Never rub the window with an abrasive material, including paper
5. Do not poke the window coating with your fingernail or any hard item,
such as a pen.
b. Principle
The finger print sensor software never stores fingerprint images. The
finger print sensor software creates a fingerprint template, which is a highly
compressed and digitally encoded mathematical representation of fingerprint
features. This template is created when a user registers a finger and is stored in
an encrypted file. When the user later touches the fingerprint reader to
authenticate, a new template is created and compared to the “registered”
template. If there is a match, the authentication is successful.
c. Finger Print Recognition
In order for the sensor to acquire a good image of your finger, you must
place the pad of your finger but not the tip in the center of the sensor window,