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Appendix C
TD Transmit Data. Serial data stream from the printer for
transmitting status and control information to the
host.
TOF Top Of Form
TTL Transistor-Transistor Logic.
true On or 1. “High true” refers to a positive relative
voltage representing the ON state; “low true” refers to
a zero or negative relative voltage representing the
ON state.
twinax Twinaxial cable. An electrical signal conductor
consisting of two wires surrounded by insulation and
a braided shield. Used to connect computers to input
or output devices.
type family See typeface.
type size See point.
type style Refers to either the upright or italic character style in
a specific font family. Roman is upright like this, italic
is slanted like this.
typeface A descriptive name or brand name that identifies a
particular design of type. Also called type family.
typographic font See font, proportional.
U
UPC Universal Product Code.
USET User-defined Set: An IGP command that creates
custom character sets (except OCR fonts) from
existing characters stored in memory.
V
VFU Vertical Format Unit
VGL Code V Graphics Language. An emulation of the
QMS Code V Magnum firmware. The software
version of the old hardware based IGP that is used in
the Printronix PSA line of printers. It provides the
same forms and barcode generation capabilities as
the IGP.
VT Vertical Tab