Automatic Gain Control - Microscan MS-3 Manual Book

Automatic Gain Control

Automatic Gain Control

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.
Gain Adjustment
(factory setting)
Definition: Sets a voltage amplitude value for the analog circuitry.
Usage: Can be useful for fine-tuning gain or when portions of analog signals
spike, as in the case of specular reflection or extraneous noise.
Caution: Changes to Gain are best done by the Calibration routine.
Serial Cmd: <K504, gain adjustment,AGC sampling,AGC min,AGC max>
Default: 90 (nominal).
Note: Gain is optimized at the factory before shipment; the default
value may not be 90.
Options: 40 to 255
AGC Sampling
Definition: AGC Sampling allows you to specify how automatic gain control sam-
pling will be done.
Serial Cmd: <K504, gain adjustment,AGC
Default: Continuous
Options: 0 = Disabled
1 = Leading Edge
2 = Continuous
Disabled
Definition: When AGC Sampling is set to Disabled, gain levels can only be man-
ually controlled by the Gain command
6).
Usage: Disabled is not recommended, but can be useful in certain applications
in which labels do not require a large depth of field.
MS-3 Laser Scanner User's Manual
7-10
sampling,AGC min,AGC max>
("Gain Adjustment" on page 6-