Oce 3050, Руководство пользователя, Страница: 55 / 119

Setting up the Océ 3050 Microfilm Scanner 55
General Hollerith information
The hollerith reader possibilities of the Océ 3050 Microfilm scanner are
experienced to be the most complicated part of the product.
Basic hollerith explanation
Many organisations punch their cards to easy their
identification. Punched hollerith cards have the big advantage that they can be
recognized by hollerith readers. The Océ 3050 Microfilm scanner has an
intelligent built-in hollerith reader.
The hollerith punches in the card represent numbers or characters. These
numbers/characters refer often to the drawing number and the original format
of the drawing. Also other information can be coded via the punches.
To understand the interpretation of the holes in the cards both the punches in
the vertical direction (column) as in horizontal direction (row) must be
explained (see figure 29).
[29] Hollerith card
The punches in the vertical direction (column)
The height of the card and the
size of the punch itself is limited to 12 possible positions of the punch in the
vertical direction.
Numbers are represented by the specific position of ONE punch in the vertical
direction. Characters are represented by the specific position of TWO or
THREE punches in the vertical direction. The position of the punch or punches
in the vertical direction are based on world-wide standards. This means that the
1 is always punched in row 1, the 2 in row 2 etc. The A is always punched in
row -2 and row 1. The B is always punched in row -2 and row 2 etc. (see figure