MSI

MSI (Modified Plessey) is a continuous, variable-length barcode symbology that encodes numeric digits (0-9) using a unique four-bit binary pattern for each digit. Developed as an enhancement to the original Plessey code, MSI is designed for internal inventory management where simple, cost-effective labeling is required without built-in error checking.

Implementation Benefits: MSI's simplicity makes it ideal for closed-loop systems where data integrity is managed through external databases rather than barcode self-checking. The continuous format provides high printing tolerance and reliable scanning performance, while the numeric-only encoding keeps implementation costs low for large-scale internal labeling projects.

Operational Efficiency: Perfect for warehouse and library environments where large volumes of simple numeric codes need reliable, cost-effective printing and scanning. While not self-checking, MSI's proven reliability and ease of implementation make it valuable for internal inventory systems that prioritize simplicity and scanning speed over complex data validation.