User's Manual

5 - 24 Symbol DS6878 Product Reference Guide
Multicode Expression
Parameter # F1h, 95h
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]
Multicode Expression