Datalogic Heron D140 빠른 참조 - 페이지 9

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BEEPER/LED

VIDEO

ILLUMINATOR

+VCC

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.

This "open collector" scanner output is

electrically

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).

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.

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

identical

to the barcode.

Video and scan signals