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Plessey Code is a
one-dimensional linear barcode symbology system based on pulse
width modulation. It was developed by the British Plessey
Company plc in 1971 and was officially used in May 1971. It is
mainly used in library management. J.Sainsbury's first
used the system in the early 1970s to identify all products on
supermarket shelves for its product replenishment system.
The main advantages
are that it is relatively easy to print on the dot matrix
printers that were popular when this code was introduced, and
that it is slightly denser than the more common 2 of 5 and 3 of
9 codes.
It was one of the
earliest barcode symbologies and is now still rarely used in
shelf labels in some libraries and retail stores, partly as a
solution to internal requirements for inventory control.
It is a barcode
symbol represented by numbers 0-9, with a start character and an
end character.
It uses a special
encoding method in which each character consists of four bars
and four spaces.
Its check digit is
obtained by summing the odd digits of all characters,
multiplying by 2, adding the even digits of all characters, and
finally taking the single digit.
It is a barcode
symbol represented by numbers 0-9, with a start character and an
end character. Plessey Corporation is an electronics, defense
and telecommunications company founded in 1917 and later spun
off and acquired. It was also the first company to design an
industrial-grade secure computer. Now, Plessey Company is mainly
engaged in the research and development of micro-LED display
technology.
It later had several
variants called Anker Code (also known as Plessey modifications)
led by ADS Corporation, Telxon, and MSI. |