Datalogic Heron D140 LASEROUT Manual de Instruções descarregar pdf (Página 9)

BEEPER/LED This scanner input drives the decoding LED,

the Good Read Spot and the beeper in the

scanner. The LED and Good Read Spot turn

on when a positive current is applied to the

pin. The beeper sound is obtained pulsating

this current at a frequency of about 2 kHz.

The maximum voltage that can be applied to

this input is 5 Vdc.

VIDEO This “open collector” scanner output is

electrically identical to the barcode. It supplies

a series of pulses the length of which are

proportional to the width of the elements

within the barcode read. Video polarity is

programmable. By default a low output level

corresponds to a bar. The frequency of the

pulses depends on the density of the code,

the distance from code and the programmed

output scan frequency (see the following

figure Video and Scan signals).

ILLUMINATOR A positive voltage (5 Vdc) is applied to this

input by the decoder when the decoding logic

senses the trigger is pressed; this causes the

activation of the illuminator and CCD.

+VCC This input must be connected to the positive

pin of the supply voltage (5 Vdc ± 5%). When

the ILLUMINATOR pin is positive, all the

current necessary to power the scanner flows

through +VCC.

CODE

VIDEO

SCAN

Video and scan signals

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

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Datalogic Heron D140 LASEROUT Manual de Instruções Página 9