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Encoding of the Plessey barcode involves a unique method of representing data through variable-width bars and spaces, primarily used in retail and industrial applications. This barcode type, also known as Plessey Code, was developed by Plessey Company in the 1970s. It encodes numeric data and supports a limited set of characters. Let's delve into the encoding process of the Plessey barcode in detail.

Structure of Plessey Barcode

The Plessey barcode consists of:

1.Start Code: Marks the beginning of the barcode.

2.Data Characters: Encodes the numeric data.

3.Check Character: Provides error detection.

4.Stop Code: Indicates the end of the barcode.

Encoding Scheme

The encoding scheme for the Plessey barcode is based on varying widths of bars and spaces. Each character is represented by a sequence of bars and spaces of different widths. Here's how the encoding typically works:

1.Character Representation: Each character (digit) is represented by a unique pattern of bars and spaces.

2.Encoding Table: There is a predefined encoding table that maps each digit (0-9) to its corresponding pattern of bars and spaces.

Example of Plessey Barcode Encoding

Let's encode the number '12345' into a Plessey barcode:

1.Start Code: The barcode starts with a specific pattern that indicates the beginning of the barcode.

Example: 101

2.Data Characters: Each digit is encoded using bars and spaces according to the encoding table.

Digit 1: Example encoding: 1001001

Digit 2: Example encoding: 1001100

Digit 3: Example encoding: 1010001

Digit 4: Example encoding: 1001000

Digit 5: Example encoding: 1000101

These patterns are derived from the encoding table specific to Plessey barcodes.

3.Check Character: The check character is calculated based on a specific algorithm (such as modulo 10) applied to the encoded data characters to provide error detection.

4.Stop Code: The barcode ends with a predefined pattern that signals the end of the barcode.

Detailed Steps in Encoding

1.Start Code: Encode the start pattern 101.

Example:

Bars: 1 0 1

Spaces: - - -

2.Data Encoding:

Convert each digit into its respective pattern using the encoding table.

For instance, the digit 1 might be encoded as 1001001.

Example:

Digit 1: 1001001

Bars: 1 0 0 1 0 0 1

Spaces: - - - - - - -

3.Check Character:

Calculate the check character based on the encoded data characters.

Add it to the end of the encoded data.

4.Stop Code: Encode the stop pattern to indicate the end of the barcode.

Example:

Bars: 1 0 1

Spaces: - - -

Example of a Complete Plessey Barcode

Combining the encoded elements:

Start Code: 101

Data Encoding (for digits 12345):

Digit 1: 1001001

Digit 2: 1001100

Digit 3: 1010001

Digit 4: 1001000

Digit 5: 1000101

Check Character: Calculated based on encoded data.

Stop Code: 101

Putting it all together:

Start Code: 101

Data Encoding:

Digit 1: 1001001

Digit 2: 1001100

Digit 3: 1010001

Digit 4: 1001000

Digit 5: 1000101

Check Character: Calculated

Stop Code: 101

Conclusion

The Plessey barcode encoding process involves translating numeric data into a sequence of variable-width bars and spaces. Each digit is mapped to a specific pattern defined by an encoding table. The barcode begins with a start code, followed by encoded data, a calculated check character for error detection, and ends with a stop code. This method ensures efficient and accurate data representation suitable for retail and industrial applications.

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