Texas Barcoding and Data Collection Links |
Austin, Texas based .. Barcoding .. Wireless Data Collection...Links and other items I'm now offering barcode consulting services and Visual Fox Pro development servicesEmail Red spud At Red_spud@hotmail.com 
Bar Coding LinksHardwareIntroductory Information about BarcodesHandHeld Symbol PSC Welch-Allyn PrintersDataMaxZebra Intermec SoftwareStrandwareStrandWare Bar Code Label Printing & Tracking Software - Label Matrix for Windows Intellitrack WMS Intellitrack Batch Software Wavelink Active Bridge Wavelink Studio Wavelink Soft Network Controller WLANA: Wireless LAN Association Not yet ClassifiedAccession, Inc: Mountlake Terrace, WA USABarCode 1 Shareware and Demoware Page BarFonts |
Saturday, February 08, 2003
Some new Resourses and Links For Developing Applications using Barcodes and Fox ProWell my interests have changed a bit and now I'm busy developing an Fox Pro Barcode based Data base project. So I'm going slowly change this page. Making it less hardware oriented and more developer oriented. Since I'm just learning Fox Pro for this application I'll most likely throw some of the most usefull links that I.ve fpound and used over the past several month up here as well. Que -- Special Edition Using Visual FoxPro 6 A good place to start. A n online book with a reasonable introduction to Foxpro. When I still evaluating what development tools I was going to use for this project I found this free resource quite useful to start learning the language. Saturday, February 09, 2002
Welcome to Texas BarcodingWell this is the first new entry on this page in quite a while. Barcode GeneratorsPrinting BarcodesActiveX Controls for Bar Code PrintingHow to get a FREE bar Code Scanner...sorry too late!!! and LinksTuesday, August 07, 2001
Free Online Barcode GeneratorThis site will generate bar codes of your choice of symbology, density and height -- but limited to 50 charaacters Free Bar Codes! Saturday, June 23, 2001
Printing Barcodes From Any PrinterPrinting 100% compliant barcodes from any printer to any label or document will ensure perfect readability. With good quality label printers with built-in barcode support this is usually possible as long as you carefully follow the manufacturer's quality control directions. But good thermal printers can cost several thousand dollars and are only designed for label printing. What about printing from general purpose printers, such as laser printers? In this case the software used is critical to guarantee perfect barcodes. The guidelines below are based on the industry standard recommendations of the Uniform Code Council for EAN/UPC symbols but the concepts apply equally well to all barcode symbologies. As a user it is important to understand these concepts in selecting the best hardware and software for barcode printing. Thermal Transfer Bar Code Label PrintersThese are commonly used printers for barcode labeling. It is most important with this type of printer to make sure that you follow the manufacturer’s recommendations for setting up the printer and testing the bar codes. Direct thermal and thermal transfer printers require specific settings for best results depending on the combination of label and ribbon materials. The manufacturer will supply the directions for the correct adjustment for your printer type. It is also very important to verify bar codes using an ANSI based verifier. This should be done after any change in the label material or any change in the printer or it settings. It should also be done or a regular basis to ensure quality is maintained and when printing a long run. To maintain the quality of printed bar codes the manufacturer’s directions for cleaning the print head and guide surfaces should be followed. It will also be necessary to replace the thermal printhead eventually as these wear out. When this happens the bar codes will no longer be readable as one or more of the dot elements will not heat properly. It is so important to verify printed symbols on a regular basis that some thermal printers can be equipped with on-line verifiers. With thermal printers the quality of the label design software you use will not effect the quality of the printed bar codes.This is because the software is just sending a command to print a bar code - a command that triggers the printer’s internal software to actually generate and print the correct bar code. General Purpose PrintersGeneral purpose printers, especially laser printers, are excellent for producing bar code labels on sheets of pre-cut labels (such as "Avery" labels) or on continuous feed labels. Obviously, for anyone needing extremely high quantities of bar codes on a daily basis thermal transfer printers with their high speed would be better, but for many users general purpose printers, especially laser printers, are preferably. Laser printers are also perfect for creating bar codes on documents, such as medical and legal records, coded "mail-merge" letters, etc. Imagesetters, such as Linotronic printers, are used to create high quality, 2540+ dpi, film positives and negatives for commercial printing. With general purpose printers, including laser, desk top, ink jet, ion deposition, dot matrix and imagesetter, the software used is critical to ensuring readable symbols. "There is a wide variety of software packages for creating symbols using general purpose printers. Unfortunately, many of these packages are capable of producing symbols with totally unacceptable quality." UCC Guidelines for Producing Quality Symbols, April 1998 The software used should beable to satisfy the following requirements: Dots Per Bar WidthWhen specifying the narrow bar (module) width the user should be able to specify an integer multiple of the printer dot width. This is best explained with an example. For a 600dpi printer the actual dot width is 1/609.6* = 0.00164". The module width should be specified as an integer multiple of printer dots, i.e. 8 dots per module gives a width of 13.12 Mils and a Magnification Factor of 100.95% 7 dots per module gives a width of 11.48 Mils and a Magnification Factor of 88.33%. (*A 600 dpi printer with an actual 609.6 dpi) Module (bar) width defined as 8 printer dots or 13.12 Mils or a Magnification Factor of 100.95% Module (bar) width defined as 13 Mils or a Magnification Factor of 100%. This is not an Integer number of printer dots. Rounding errors could occur when printing. The easiest way to achieve the correct module width for your printer is to have software that: i. Allows you to specify the target printer resolution or finds the resolution for you for the printer you have selected. ii. Then allows you to specify the module width in "printer dots" (it would already know the "dots per inch"). You would select the number of printer dots that most closely matches the Magnification Factor, or module width in Mils, that you desire. If you wanted 100% magnification an "8 printer dot" width for a 600 dpi printer would be the closest. Bar Width ReductionThe software you select also needs to have an option for "Bar Width Reduction." This is important when printing to any printer that has "dot spread". This includes ink jet printers and "wet ink" printers (but not laser printers). For these printers one dot of bar width reduction is recommended per bar width. For instance for a 300 dpi ink jet printer with a module width of 13.12 Mils (4 printer dots per module width) Bar Width Reduction of one dot would be 3.28 Mils or 25%. Bar Width Reduction is also required when bar codes are going to be printed on a commercial (wet ink) press. In this case the artwork containing the bar code is usually output on film from an Imagesetter. Imagesetters have resolutions of 2400+ dpi so the required bar width reduction can be specified exactly. The actual amount of reduction required is determined by the paper and ink used and this should be specified by the printer. If printing to a smooth hard surface, such as a glass bottle, Bar Width Gain may be required. Again, you should consult your commercial printer for his recommendations before generating the bar codes. Bar Code Graphic TypeThere are 3 main types of bar code software products: 1.Bar Code Fonts 2.Bit-map (Raster) Bar Code Generators 3.Vector Bar Code Generators Each is discussed below: 1 Bar Code Fonts "Bar code fonts have been known to create EAN/UPC symbols with serious design defects. The problems may be caused by the design of the font, an operator input, or a combination of both." UCC Guidelines for Providers of EAN/UPC Symbol Design Software, July 1997. "Extreme caution should be used when producing EAN/UPC symbols with bar code fonts." The Uniform Code Council does not recommend the use of fonts. As problems it cites in particular the ability to manipulate the size of individual characters (distortion), spacing between the characters (kerning) and the possibility of font or resolution substitution at the output stage. However there are many other problems with bar code fonts. The user cannot specify the module (bar) width exactly in printer dots. Fonts do not support Bar Width Reduction. Nor do they support many of the features specific to bar code symbols such as Bearer Bars, Quiet Zones, independent symbol height and module (bar) width specification, symbol rotation and support for binary data (including ACSII nulls in Code 128, Code 39, Code 93 and PDF 417). In addition, most fonts do not automatically calculate and add check digits and other security features to bar codes. 2 Bit-map Bar Code Generators A bit map image is device dependent. This means a bitmap of a one inch square to be printed at 300 dpi would be 300 pixels across by 300 pixels down. If a bar code designed to print one inch square on a 300 dpi printer were printed instead on a 600 dpi printer the resulting bar code would be ½ inch x ½ inch. This is because there would only be 300x300 pixels in the image instead of 600x600. The other problem with bit-maps images is their size. If you are printing to a 200 dpi printer a one inch square would contain 200 x 200 =40,000 bits of data. This is bad enough but to a higher resolution printer, such as a common 600 dpi printer it would be 360,000 bits of data (and 6.5 million bits of data for a 2540 dpi Imagesetter!!). These huge files not only use large amounts of computer memory they also print extremely slowly. 3 Vector Bar Code Generators Vector graphics are perfect for defining bar code images. A vector image is a set of drawing commands that precisely defines the edges of each bar and specifies how to fill in the area created within the defined edges. Vector images are completely device independent as they are a set of precise commands instead of a collection of dots. A 1" x 1" box will print 1" by 1" on a 100, 600 or 2540 dpi printer! When a vector image is sent to a general printer the printer’s software converts it to a raster image so that it can print it. The Raster Image Processor in the Printer converts the precise path commands in the vector graphic into a series of pixels. Hence the exact measurements of the image are influenced by the resolution of the printer. A higher resolution printer will be able to more precisely match the exact measurements of the vector graphic. A lower resolution printer will need to round the dimensions to the nearest integer number of printer dots. This is why it is so important, especially in printers of 600 dpi or less, to specify the module (bar) width in integers of printer dots (see part 1 above). Vector bar code graphics are also much smaller than other bar code graphics so they print many, many times faster. For instance, a typical 1" high UPC code at 100% magnification would create a 149 KB bitmap for a 600 dpi printer. A Windows Metafile (WMF) vector graphic of this bar code would be 2 KB and an Encapsulated Postscript (EPS) vector graphic with a TIFF preview would be 48 KB and 29 KB without the TIFF preview. Windows Metafiles (WMF) are the best graphic format for bar codes in Windows and EPS in the Mac (Macs do not support WMF graphics). Once the bar code is created by any bar code software it should not be resized, scaled or stretched. If the bar code is to be transferred to a second party, information, such as the minimum printer resolution for that bar width, should be communicated. Bar Code VerificationAs with Thermal Transfer printers, it is important to test the output from General Purpose printers using a bar code verifier. The UCC recommends using the test symbols: 0 12345 01234 1 6 78912 56789 0 If they fall below a grade B check that you have specified a Magnification Factor (or module width) that corresponds to an integer number of printer dots per module (bar) width. Bar Width Reduction may also be required as discussed above. If the user does not have a bar code verifier he can submit the bar codes to a qualified testing organization. If nothing else, at least they should be tested with a bar code reader ActiveX Control for Bar Code PrintingThe TAL Bar Code ActiveX Control is an excellent tool for printing bar codes from an Access database report as well as from other programs that support ActiveX controls. The printing of the bar codes is the easy part. You also need to interface a bar code scanner to your PC to input the bar code data into your database. There is a good article on how how a bar code reader works and ow they interface to a PC at: www.taltech.com/TALtech_web/resources/intro_to_bc/bcpwork.htm Keyboard Wedge vs. Software WedgeMost bar code readers are available with one of two output options. The first option is called "Keyboard Wedge" output where you unplug your keyboard, plug the bar code reader into the keyboard port on your PC and then plug your keyboard into the bar code reader. This arrangement makes the bar code reader appear as it it were simply a second keyboard. Your original keyboard continues to work as normal however when you read a bar code, the data encoded in the bar code appears to any aplication running on your PC as if it were typed in. The keyboard wedge interface is extremely simple however it has a few drawbacks. If you swipe a bar code, the cursor has to be in the correct input field in the correct application otherwise you end up reading bar code data into whatever application has the focus. This can cause all sorts of potential problems as you can imagine. The keyboard output also is limited in that you cannot modify the data in any way before sending it into the program that is to receive the data. For example, if you needed to parse a bar code message up into pieces or remove some of a bar code message or add in a date or time stamp you would not be able to with a normal keyboard wedge reader. The other possible output option is to get a bar code reader with an RS232 or "Serial" interface. With these types of bar code readers, you connect the reader to an available serial port on the back of your PC.You would then need a program called a "Software Wedge" to take the data from the bar code reader and feed it to the application where you want the data to go. The disadvantage to this approach is that it is a little more complex however you gain much more control over how and where your data ends up when you read a bar code. With a Software Wedge, you can control exactly where the data goes in the target application and you can also perform all sorts of modifications on the data before it is sent to the application. Wednesday, May 02, 2001
Google Search: insubject:bar insubject:code
How to get a free Bar Code ScannerGo to Radio Shack. Ask for CueCat scanner. They'll gladly give you one for free, if you give them your address (give 'em a fake one if you like) Follow directions to plug into your computer, but DON'T load their software. Download software on web (http://www.logorrhea.com/cuecat/catnip.zip) that will turn your CueCat into input device (like your keyboard). Tab to the field (on form or in table) you have in Access to store barcode numbers. Scan the barcode and viola! Barcode entry complete!!! Sunday, March 18, 2001
Bar Coding LinksBarcode and Portable Data Collection HardwareIntroductory Information about Barcodes Data Collection Specialists HandHeld Symbol PSC Welch-Allyn Barcode PrintersDataMax Zebra Intermec Barcode SoftwareStrandware StrandWare Bar Code Label Printing & Tracking Software - Label Matrix for Windows Intellitrack WMS Intellitrack Batch Software Wavelink Active Bridge Wavelink Studio Wavelink Soft Network Controller WLANA: Wireless LAN Association Not yet ClassifiedAccession, Inc: Mountlake Terrace, WA USA BarCode 1 Shareware and Demoware Page BarFonts |