Code 93 is a barcode symbology that was designed in 1982 by Intermec to enhance data density and security over its predecessor, Code 39. It is an alphanumeric, variable length symbology, which means it can represent letters and numbers and adjust its length based on the amount of data it encodes. The design of Code 93 is such that each character is nine modules wide, consisting of three bars and three spaces, which contributes to its name. This structure allows it to encode 26 upper case letters, 10 digits, and 7 special characters, along with an additional 5 special characters for full ASCII representation.
The barcode itself begins and ends with a start/stop character, ensuring scanners recognize where the code begins and ends. Between these markers lies the encoded message, followed by two check characters for verification purposes. These check characters are calculated using a modulo-47 algorithm, which adds a level of error detection and correction to the symbology.
In terms of usage, Code 93 is notably employed by Canada Post for encoding supplementary delivery information. Its ability to encode full ASCII characters makes it versatile for various industries, including inventory management, shipping and receiving, and asset tracking. The high-density encoding of Code 93 also means it can store more information in a smaller space, making it ideal for applications where space is at a premium.
Scanning Code 93 barcodes is straightforward and can be done with various devices, including barcode scanners, mobile devices with cameras, POS systems, and industrial scanners. The process typically involves aiming the scanner at the barcode, ensuring it's within the field of view, and waiting for the device to read the code, often indicated by a beep or a visual cue.
Overall, Code 93's design provides a compact and secure way to encode information, and its widespread adoption across different sectors underscores its effectiveness and reliability. Its continued use in postal services and beyond attests to its practicality and the importance of barcode technology in efficient data management and logistics.
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