![]() ![]() Each is important by itself but they work together as a hand to complete tasks. It is like five fingers fitting perfectly in the five fingers of a glove. The data collection software and hardware can be the best but if the bar codes either cannot be read or are difficult to read, the system will not achieve it’s anticipated benefits and savings.Ī description of each of these four elements and how they relate to each other is given below. The coordination of these four elements determines the success or failure of all scanning systems. Many times the system requirements for scanning a bar code are discussed after the scanning equipment has been chosen and the bar code configuration has been determined because of constraints on the size of the label. It is imperative that the system development and implementation teams match the actual scanning requirements with the proper bar code configuration and scanning devices. Testing is always recommended because of the other elements than contribute to successful bar code scanning. Each scanning device manufacturer has it’s own specifications for each of their distance options. The long range distance scanner has a greater depth of field which can be extended even more when using retro reflective material extending the scanning distance to over 28′ using a 100 mil “X” dimension. This would be with standard white material with or without a laminate. A 50 mil “X” dimension can be scanned from about 3 inches to 36 inches. For a standard range distance scanner a 20 mil “X” dimension can be scanned from about 2 inches to 18 inches. The compatibility of the “X” dimension of the bar code to the light source of the scanner determines the system requirements for scanning distance.Įach scanning device has a depth-of-field for each increment in the size of the “X” dimension. The density of the bar code is determined by the size of the “X” dimension (the width of the narrow bar or element) and the ratio of wide to narrow elements within the symbol. The most critical relationship in these elements is the density of the bar code, which determines the scanning depth-of-field. ![]() The following four (4) elements and their compatibility contribute to the successful, high (99.99%) first read rate and high (99.5%) read rate, use of bar codes in any data collection application. Once the these steps are completed, you can move on to adding fields to the label/tag format and determining data sources for the identified fields. Conversely, if you start with the label/tag size, you must design the bar code within it. ![]() If you start with the bar code size required, you can then design the label/tag size around it. Remember, in both instances, to include the quiet zone requirements of the bar code chosen. Depending upon the constraints identified, you can start by defining the label size or the bar code size. Once the constraints have been identified, the rest of the process can be designed. These may include the scanning distance required, the number of characters to be encoded, the type of characters to be encoded (alpha and/or numeric), the size and orientation of the area to which the label or tag will be affixed, and (if printed on site) the width of the print head. These would be the components that cannot be changed. Start by listing the constraints within the project. ![]()
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