Printronix ANSI Printer Programmer's Reference Manual page 93

N/A
NACK
NAK
NL
nibble
NLQ
Not Ready mode
nS
NVFU
NVRAM
OCR
off-line
Ohm
on-line
N
Not available or not applicable.
Negative-Acknowledge reply. A reply from the printer
to the host indicating that an exception has occurred.
Contrast with acknowledge character.
Negative-Acknowledge character. A transmission
control character transmitted by the printer as a
negative response to an enquiry from the host.
New Line (3287 only).
A unit of storage containing half of a byte, usually
four bits.
Near Letter Quality.
Offline. The printer is not ready to receive and
process commands and data.
Nanosecond (one billionth of a second)
Direct Access Vertical Format Unit. See also
DAVFU.
NonVolatile Random-Access Memory. A type of
RAM in which stored data are not lost when the
power is interrupted or turned off. A battery supplies
power to NVRAM when the system does not. Unlike
ROM (another type of nonvolatile memory), NVRAM
is accessible and its contents can be altered.
O
Optical Character Recognition. A process by which a
machine can "read" characters printed in a special
standardized font. Data are read by a photoelectric
optical scanner and recorded on magnetic tape or
disk. OCR-A and OCR-B are two widely used OCR
fonts.
An operational state in which the printer cannot
accept commands or data from the host computer,
but can perform self-tests, form settings, and record
configuration changes.
A unit of measurement for electrical resistance.
An operational state in which the printer is under
direct control of the host computer. In this state, the
printer accepts commands and data sent from the
host computer, and acts on them immediately.
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