This would allow automated data collection systems to read the PDF417 while still supporting those in the field with simple linear barcode scanners.
#Iunit label linear serial
It may be advantageous for some data, such as serial numbers, to remain in linear bar code format in addition to the 2D symbol. This leaves room for interpretation and some degree of flexibility on the part of the supply chain.
Paragraph 5.4a states that the container identification must include PDF417 symbols and/or linear bar codes. Have linear bar codes been entirely replaced by the PDF417? Not necessarily. For the DOD, use of the PDF417 allows the depots to use automated data collection systems, which was virtually impossible with linear barcodes. For the contractor, this can reduce the number of labels and their complexity. Revision R went further, suggesting that the 2D symbol entirely replace all linear bar codes on container labels. In Notice 4, the 2D symbol mostly supplemented the linear bar codes.
#Iunit label linear serial numbers
The PDF417 is a very dense data symbology which can accommodate all of the data previously required to be linearly bar coded (NSN, Contract, CLIN, CAGE and Shipment Number), as well as the maximum number of five serial numbers or UIDs per container. The use of two-dimensional PDF417 bar codes for container identification was introduced in Mil-Std-129P (Notice 4) as a method of handling the demands of Unique Identification (UID) markings, which at up to fifty characters in length are practically impossible to represent with traditional Code39 linear bar codes. In cases where the exterior container serves as unit pack, only exterior container marking rules apply. In a broad sense, the unit container may be thought of as the consumer packaging, while the exterior container provides protection for shipping and includes address labeling in the form of the Military Shipment Label(MSL). Most shipments use a combination of unit packs and exterior containers. However, there are special marking rules for their use, as well as Radio-Frequency Identification (RFID) tagging implications. Note that pallets are not containers, rather something that containers sit on. There are rules for marking each container level, and for unpacked items.
The first thing to know is that there are three kinds of containers: unit, intermediate and exterior, as shown below. This guide is intended to simplify compliance with the latest revision of the Mil-Std-129 (Revision R, Change Notice 2) and provide some clarification of its complex rules. Like many technical specifications it can be difficult to comprehend, particularly for those new to defense contracting. Mil-Std-129 prescribes how DOD suppliers are to mark shipments to the military.
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