Motorola DS9208, Руководство по продукции

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User Preferences & Miscellaneous Options 4 - 31
Multicode Expression
Parameter # 661
Use this feature to program a multicode expression for Multicode Mode (grid method). The default is 1, which
indicates any bar code.
To set the multicode expression:
1.
Scan the bar code below.
2.
Scan bar codes from the alphanumeric keyboard in the Advanced Data Formatting Programmer Guide to
define the expression.
3.
Scan the
End of Message
bar code from the Advanced Data Formatting Programmer Guide.
Multicode Expression Syntax: [n] [Element 1]; [Element 2 ]; ... [Element n];
Where n is the number of elements in the overall expression.
The multicode expression describes the bar code(s) that the digital scanner can expect to find in an image.
Each element represents one bar code in the digital scanner's field of view. The order of elements in the
expression is the order in which bar code data from each element transmits to the host. Elements are defined
using one or more of the following methods:
By Region
. This type of element limits decoding to a specific area within the digital scanner's field of view.
Region coordinates are defined as the top left and bottom right corners of the region, expressed in
percentages of the field of view. These can range from 0% to 100%, or 0x00 to 0x64 in hex, for both horizontal
and vertical axes. A region element is constructed as:
[R] [4] [Top, Left] [Bottom, Right]
Where:
•
[R] is the character R
•
[4] is 0x04, indicating there are four bytes thereafter to describe the region
•
[Top, Left] are two values representing the top left corner of the region
•
[Bottom, Right] are two values representing the bottom right corner of the region
By Code Type
. An element can specify a specific bar code symbology to find and decode somewhere in the
field of view. A code type element is constructed as:
[C] [2] [Code Type]
Where:
•
[C] is the character C
•
[2] is 0x02, indicating there are two bytes thereafter to describe the code type
•
[Code Type] is the desired symbology's parameter number (see Chapter 10, Symbologies ). For
single-byte parameter numbers, extend the value to two bytes by adding 00 before the parameter
number.
Multicode Expression