Oki 182 Handbook page 169

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_ _ _ _ _ _ _ _ _ GLOSSARY
Protocol
RAM
ROM
RS232-C
Serial Interface
Software
A set of rules controlling serial communication
between the computer and the printer. Using
signals defined by a protocol, the printer can
acknowledge that it has received data or tell the
computer to stop sending data until more storage
space in the printer is available. Protocols also set
the format for data transmission.
Random Access Memory: a temporary memory
device (integrated-circuit chip). In MICROLINE
printers, RAM is used for temporary storage of
data before printing (this type of RAM is called a
buffer) and for storage of commands to change
printing features, VFU formats, and DLCG
characters.
NOTE: This type of memory is volatile; that is, it is erased
when the printer is turned off.
Read-Only Memory: a permanent storage device
(integrated-circuit chip). Information stored in ROM
or firmware, can be read but cannot be added to or
changed. In MICROLINE printers, ROM is used to
store the dot patterns for the character sets, instruc­
tions for interpreting control codes, etc.
A uniform standard for serial interfaces set by the
Electronic Industries Association (EIA). It establishes
standards for signals and cabling. Most personal
computers follow this standard for serial interfaces
with some variations.
An interface in which the eight bits in each byte of
data are transmitted one after the other over one
wire.
A program or set of instructions that tells your com­
puter or printer what to do. It is called soft because,
like words, it does not really have a physical form
the way something like a rock does. A software
package is a commercially prepared program or set
of programs, usually sold on a disk or cassette tape.
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