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AGC Sampling

6-8 MS-820 Industrial Bar Code Scanner User’s Manual

6–Scanner Setup

AGC Sampling

Disabled

Leading Edge

Continuous

Definition: AGC is the acronym for Automatic Gain Control. AGC increases the

depth of field by attempting to maintain signal strength at a constant

level regardless of the range of the bar code label.

AGC Sampling allows you to specify how automatic gain control sam-

pling will be done.

Serial Cmd: <KD gain,AGC sampling,AGC min,AGC max>

Default: Continuous

Options: 0 = Disabled 1 = Leading Edge 2 = Continuous

Definition: When AGC Sampling is set to Disabled, gain levels can only be man-

ually controlled by the Gain command.

Usage: Disabled is not recommended, but can be useful in certain applications

in which labels do not require a large depth of field.

Definition: Finds the leading edge of a symbol by looking for a 40 µs quiet zone fol-

lowed by the number of transitions, stores the highest value of the

samples, and adjusts the AGC accordingly at the end of the scan.

Usage: Leading Edge is rarely used, but in some cases can improve scan rates

when labels are skewed and the leading edge of a label is difficult to

locate.

Definition: Samples AGC throughout the scan at the rate averages the sample val-

ues, and adjusts the AGC value at the end of the scan.

Usage: Continuous is the default and the preferred mode for sampling analog

signal amplitude.

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Microscan MS-820 Manual de usuario Pagina 104