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[[File:Plessey_barcode.svg|400px|right||thumb|A Plessey Code Barcode Label]]
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'''Plessey Code''' is a 1D linear [[barcode]] symbology based on [[pulse width modulation]], developed in 1971 by [[Plessey|The Plessey Company plc]], a British-based company. It is one of the first barcode symbology, and is still used in some rare libraries and for shelf tags in retail stores, in part as a solution to their internal requirement for stock control. The system was first used in the early 1970s by J.Sainsbury to identify all of its products on supermarket shelves for its product restocking system.
 
The chief advantages are the relative ease of printing using the dot-matrix printers popular at the time of the code's introduction, and its somewhat higher density than the more common 2 of 5 and 3 of 9 codes. It has latter led several variations as Anker Code by ADS Company, Telxon, and [[MSI_Barcode|MSI]] (also known as Plessey modified). It is difficult to have the specifications for them nowadays and thus hard to tell the differences between them (except for MSI), because is was mainly available as paper document and in discontinued since then.
<!--
there might be errors because lack of sources -->
 
== Encoding ==
 
[[File:Plessey_barcode_composition.svg|400px|right||thumb|Plessey Code barcode composition]]
The barcode encodes [[hexadecimal]] digits (i.e., the hex digits 0-F) as 4 bars (bits). The [[Least_significant_bit|LSB]] is on the first bar on the left, and the [[Most_significant_bit|MSB]] is the last bar on the right. A "0" bit is represented as a narrow bar, followed by a wide space. The "1" is represented by a wide bar, followed by a narrow space.
 
The barcode can be read in either direction (left to right or right to left).
 
The barcode comprises:
* the forward start code
* the label / data digits
* the check code, for error detection
* the termination bar
* the reverse start code
 
=== Forward start code ===
 
The forward start code is "1101". It defines the beginning of the encoded text.
 
=== Label ===
 
[[File:Plessey_barcode_values.svg|300px|right||thumb|Plessey Code values]]
The character of the text to encode are hexadecimal values encoded as reversed BCD
 
{| border="1"
! Value !! Encoding !! Value !! Encoding !! Value !! Encoding !! Value !! Encoding
|-
| 0 || 0000 || 4 || 0010 || 8 || 0001 || C || 0011
|-
| 1 || 1000 || 5 || 1010 || 9 || 1001 || D || 1011
|-
| 2 || 0100 || 6 || 0110 || A || 0101 || E || 0111
|-
| 3 || 1100 || 7 || 1110 || B || 1101 || F|| 1111
|-
|}
 
=== Check code ===
 
The check code for error detection and correction is as [[Cyclic_redundancy_check|CRC]], using [[polynomial]] [[Mathematics_of_CRC|division]]. Is uses 2 characters, or 8 bits. The generator polynomial is <math> g(x) = x^8 + x^7 + x^6 + x^5 + x^3 + 1</math> with n=8, in binary "111101001".
 
=== Termination bar ===
 
The termination bar follows the CRC. It's a full pitch bar.
 
=== Reverse start code ===
 
The reverse start code, with the forward start code, are used to detect the direction of reading : from left to right or right to left. It's encoded as a reversed "0011". Reversed because the "0" is represented by a wide space and simple bar, and "1" as a simple space and wide bar.
 
== Dimensions ==
 
[[File:Plessey_barcode_anker_dimension.svg|100px|right||thumb|bit dimensions]]
The dimensions of the bars and spaces are defined by the following rules :
 
<math>\frac{a}{b}<1</math> , with b < 0.229&nbsp;mm
 
<math>\frac{c}{d}>0.33</math> , with c > 0.127&nbsp;mm
 
Bit dimension in mm :
{| border="1"
! colspan="2" | !! colspan="4" | "1" !! colspan="4" | "0"
|-
! bit/inch !! pitch 'p' !! width !! min !! nom !! max !! width !! min !! nom !! max
|-
| rowspan="2" | 40 || rowspan="2" | 0.635 || bar 'a' || 0.305 || 0.343 || 0.381 || bar 'c' || 0.114 || 0.127 || 0.152
|-
|  space 'b' || 0.254 || 0.292 || 0.305 || space 'd' || 0.471 || 0.508 || 0.533
|-
| rowspan="2" | 32 || rowspan="2" | 0.787 || bar 'a' || 0.394 || 0.432 || 0.470 || bar 'c' || 0.127 || 0.152 || 0.173
|-
|  space 'b' || 0.318 || 0.356 || 0.394 || space 'd' || 0.584 || 0.635 || 0.685
|-
| rowspan="2" | 25 (std.) || rowspan="2" | 1.020 || bar 'a' || 0.533 || 0.584 || 0.635 || bar 'c' || 0.127 || 0.178 || 0.229
|-
|  space 'b' || 0.381 || 0.432 || 0.483 || space 'd' || 0.787 || 0.838 || 0.889
|}
 
Values are slightly different for [http://www.idhistory.com/miscsymbolprops/AnkerPlessey.pdf Anker Code]
 
Before and after each barcode, there should be margins of 4 bits.
 
==External links==
 
* [http://www.adams1.com/plessy.html Plessey Code description by Barcode 1]
* [http://philippe.corbes.free.fr/codebarre/codebar/codebar.html#Plessey Plessey Code description](fr)
* [http://www.idhistory.com/miscsymbolprops/AnkerPlessey.pdf Anker Code partial specification]
 
{{Barcodes}}
 
[[Category:Barcodes]]

Latest revision as of 00:59, 25 September 2014

by Nas, is very fitting and the film agrees with it. The next step is to visit your Word - Press blog dashboard. These templates are professionally designed and are also Adsense ready. If you are using videos on your site then this is the plugin to use. After activating, you will find their website link and get the activation code from their website.

These websites can be easily customized and can appear in the top rankings of the major search engines. If a newbie missed a certain part of the video then they could always rewind. Which is perfect for building a mobile site for business use. You can up your site's rank with the search engines by simply taking a bit of time with your site. Now a days it has since evolved into a fully capable CMS platform which make it, the best platform in the world for performing online business.

Just ensure that you hire experienced Word - Press CMS developer who is experienced enough to perform the task of Word - Press customization to get optimum benefits of Word - Press CMS. Word - Press has ensured the users of this open source blogging platform do not have to troubleshoot on their own, or seek outside help. You can now search through the thousands of available plugins to add all kinds of functionality to your Word - Press site. If you have any type of inquiries pertaining to where and ways to utilize wordpress dropbox backup, you could call us at our web-page. To turn the Word - Press Plugin on, click Activate on the far right side of the list. Socrates: (link to ) Originally developed for affiliate marketers, I've used this theme again and again to develop full-fledged web sites that include static pages, squeeze pages, and a blog.

Whether your Word - Press themes is premium or not, but nowadays every theme is designed with widget-ready. Cameras with a pentaprism (as in comparison to pentamirror) ensure that little mild is lost before it strikes your eye, however these often increase the cost of the digital camera considerably. Some examples of its additional features include; code inserter (for use with adding Google Analytics, Adsense section targeting etc) Webmaster verification assistant, Link Mask Generator, Robots. It's now become a great place to sell it thanks to Woo - Commerce. OSDI, a Wordpress Development Company based on ahmedabad, India.

As a open source platform Wordpress offers distinctive ready to use themes for free along with custom theme support and easy customization. Sanjeev Chuadhary is an expert writer who shares his knowledge about web development through their published articles and other resource. Just download it from the website and start using the same. It is a fact that Smartphone using online customers do not waste much of their time in struggling with drop down menus. Likewise, professional publishers with a multi author and editor setup often find that Word - Press lack basic user and role management capabilities.

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