Microscan MS-860 User Manual page 102

Automatic Gain Control (AGC)
AGC Sampling Mode
Usage: AGC Sampling allows you to specify how automatic gain control sam-
pling will be done.
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 symbol.
Serial Cmd: <K504,gain
Default: Continuous
Options: 0 = Disabled
Disabled
Usage: Disabled is not recommended, but can be useful in certain applications
in which symbols do not require a large depth of field.
Definition: When AGC Sampling is set to Disabled, gain levels can only be manually
controlled by the Gain command.
Leading Edge
Usage: Leading Edge is rarely used, but in some cases can improve scan rates
when symbols are skewed and the leading edge of a symbol is difficult to
locate.
Definition: Finds the leading edge of a symbol by looking for a 40µS quiet zone fol-
lowed by the number of transitions set in
7-21, stores the highest value of the samples, and adjusts the AGC
accordingly at the end of the scan.
Continuous
Usage: Continuous is the default and the preferred mode for sampling analog
signal amplitude.
Definition:
Samples AGC throughout the scan at the rate set in
Counter"
AGC value at the end of the scan.
MS-860 Industrial Raster Reader User's Manual
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level,AGC sampling mode,AGC min,AGC max>
1 = Leading Edge
on page 7-21, averages the sample values, and adjusts the
Read Cycle
2 = Continuous
"Transition Counter" on page
"Transition
7-19