Oki Microline 3390 User Manual page 341

Appendix F: Index / Glossary
Protocol, Handshake
A protocol secures the data transmission.
Depending on the interface the printer out-
puts a message by control characters or sepa-
rate signal lines that the receiving memory is
full and is able to ensure a correct data recep-
tion and transmission.
Random Access Memory (RAM)
See »Main Internal Storage«.
Reset
Systems (computer, printer) are returned to
their initial state.
Resident
A term used in data processing with respect
to contents of the RAM.
Resolution
The resolution of the print depends on the
pin diameter of the print head. The resoluti-
on is mostly measured in dots per inch (dpi).
For graphics the resolution varies from 72
dpi (9-pin printer) up to 300 dpi (24-pin prin-
ter).
ROM (Read-Only Memory)
In this read-only memory which cannot be
changed the firmware - the control program
of the printer - is stored (emulation and con-
trol of the printing mechanism).
RS-232C Interface
A serial interface according to an American
standard. It corresponds to the international
ITU standard V.24 in conjunction with V.28
and German standard DIN 66020.
F-10
Serial Interface
A connection for data transmission (succes-
sively bit-by-bit) between printer and com-
puter. Serial interfaces are suited for longer
distances. See also »RS-232C«.
Set Character Spacing
Similar to typewriter fonts every character
occupies the same space regardless of its ac-
tual width. See also proportional fonts. The
character spacing is given in characters per
inch (cpi).
Shift-Key
By pressing this key a second key function is
activated.
Transportation Unit
It transports continuous paper safely and ex-
actly. The spikes of the transport rollers grip
the punched holes of the paper to push it or
pull it.
For pushing, the transportation unit feeds
the continuous paper from the reverse or
bottom side through the printing mecha-
nism.
For pulling, the transportation unit pulls the
paper from the top side from the printing
mechanism.
Unidirectional Print
The printer prints only in one direction (from
the left to the right). Especially suited for the
precise print of graphics.