Metrologic Instruments IS4220 Manuel D’Utilisation

 

 

11

I

NFRARED

 

(IR)

 

O

BJECT 

S

ENSOR

 

 
An infrared (IR) device located behind the window initiates the scanning process. 
The IR sensor is active as long as power is applied to the unit.  When the IR 
sensor detects an object, the green LED will flash.  When the laser decodes a 
bar code, the scanner transmits the data to the host system and emits a beep to 
show that decoding is complete.  The IR sensor range can be programmed for 
two ranges.  
 
 
 
Short Range Activation 
 
The IR signal initiates the scan process if it senses an object anywhere from the 
face of the window out to approximately 4" to 7". 
 
 
 
Long Range Activation 
 
The IR signal initiates the scan process if it senses an object anywhere from the 
face of the window out to approximately 9" to 13".  
 
If the object is removed from the field during the scanning process, the laser 
turns off and the scanner re-enters "standby" mode.  However, if the object stays 
in the field, the laser remains on for up to 2.5 seconds trying to detect another 
bar code.  If the scanner does not detect a bar code, the scanner re-enters 
"standby" mode.  To reactivate the scanning sequence, remove the object and 
present another. 
 
If the same symbol stays in the field after a successful scan, the laser stays on 
for approximately 7.5 seconds and then turns off.  This prevents unintentional 
reads of the same bar code.  To read the same symbol more than once, remove 
the object from the scan field for approximately 1 second and then present the 
symbol again.