AT-4
FAAC S.p.A. Via Calari, 10
– 40069 – Zola Predosa (BO) - Italy
Page 23 of 25
8 READING RANGE (SENSITIVITY)
8.1 PRINCIPLE
The reading range of AT-4 can be controlled by the built-in sensitivity
function. When the power of the received signal is below the sensitivity level,
no identification is possible. The power of the received signal becomes
higher when the transponder comes close to the reader. When the power of
the received signal exceeds the sensitivity level, the transponders are
detected.
Distance
Po
wer of th
e rec
ei
v
ed s
igna
l
ric
ev
uto
0 m
5 m
Max reading range for
this level
Sensitivity level setting
Transponder signal < sensitivity level :
no reading
Transponder signal > sensitivity level :
reading
Sensitivity level
Transponder signal
Fig. 21: Sensitivity
8.2 ADJUSTING THE READING RANGE
SQ-LVL Turn the potentiometer clockwise:
Max. reading range (sensitivity function disabled).
SQ-LVL Turn the potentiometer anti-clockwise:
Min. reading range.
SQ-LVL
SQ-ACT
SQ-ENA
Fig. 22: Sensitivity level setting
Two LEDs indicate the sensitivity status. When the sensitivity function is
active, the LED SQ-ENA is ON. LED SQ-ACT is ON when the signal of the
transponder is below the sensitivity level (red area in Fig. 21).
