Telepen is a linear barcode symbology capable of encoding full range of ASCII characters. Telepen was developed in 1972 in UK and contain a checksum digit.

Telepen is also known with other well-liked names including Telepen Barcode, Telepen Numeric, Telepen Full ASCII, and SB Electronic Systems Barcode.

Character set of Telepen

Telepen contains the following character set:

• Digits (0-9)

• Lowercase letters (a-z) and Uppercase letters (A-Z)

• Punctuation Marks

• Non-printable control characters including carriage-return, line-feed, horizontal tab,etc.
  

Telepen barcode contains two different modes:

• Alphanumeric mode

• Numeric-only mode

Structure of Telepen

The fundamental four bar-space modules are defined by Telepen:

• Narrow bar-narrow space for bit 1

• Wide bar-narrow space for bit sequence 00

• Wide bar-wide space for bit sequence 010

• Narrow bar-wide space for bit sequence 01 or 10 (the sense vary, as a result 01110 is encoded as 01 1 10 where first and third module is identical).

The scheme permits encoding all even parity bytes and able to still be used for uninterrupted bit stream.

Applications of Telepen

• Telepen have been employed in various countries and mainly used in UK.
• Many universities and other academic libraries implement Telepen.
• Telepen is also used in military applications.

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