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Glossary, continued
transmission rate
The speed at which information is transferred. With a portable reader, the
transmission rate is in inches per second and is used when a scanner replaces
a wand.
transmitted symbology
The bar code symbology that is transmitted from the scanner to the terminal or
portable reader.
TTL
Transistor-transistor logic. A widely used family of integrated circuits whose
principle switching components are bipolar transistors
UPC
Universal Product Code, used in the supermarket industry since 1973. A
fixed-length, numeric, continuous symbology employing four element widths.
Version A encodes 12 digits and Version E encodes 6 digits.
XON/XOF
A protocol in which the terminal sends a character to the scanner to indicate
when it can receive data and when it cannot.
1551C Decoding Laser Scanner User's Guide
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