
M3000 Portable Bar Code Reader User's Guide
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APPENDIX F - INTERLEAVED 2 of 5 SPECIFICATIONS
The Interleaved 2 of 5 bar code symbology is a numeric code (0 - 9) which has different start and
stop characters. The name Interleaved 2 of 5 is derived from the fact that two characters are paired
together using the bars to represent the first character and spaces to represent the second. Each
character has two wide elements and three narrow elements.
CHARACTERISTICS:
Character Set: Numeric only (0 - 9)
Symbol Length: Variable (must be an even number of digits)
Check Digit: Optional
Bi-directional Decoding: Yes
Maximum Density: 18 char./inch (using .0075 inch narrow element)
CHARACTER SET:
The following table illustrates the data patterns. A "1" represents a wide bar or space and a "0"
represents a narrow bar or space.
0123456789
OPTIONAL CHECK DIGIT:
Interleaved 2 of 5 may contain an optional check digit. The reader supports two types of check
digits:
1. Uniform Symbology Specification (USS) - calculated as modulo 10 check digit based on 3-1-3
weightings.
2. Optical Product Code Council (OPCC) - calculated as modulo 10 check digit based on 2-1-2
weightings.
USS CHECK DIGIT CALCULATION:
1. From right to left, sum the digits in the odd positions.
2. Multiply this sum by 3.
3. From right to left, sum the digits in the even positions.
4. Add this sum to the product of step 2.
5. The modulo-10 check digit is the smallest number which when added to the sum of Step 4
produces a multiple of 10.
CHARACTER PATTERN
0 00110
1 10001
2 01001
3 11000
4 00101
5 10100
6 01100
7 00011
8 10010
9 01010
start 0000
stop 100
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