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CLEARjet GmbH
CX-one
7 DIRECTION
DETECTOR
7.1 Functionality
The module 'direction detector' serves to determine the card position in the printing unit.
Cards that are inserted the wrong way around are recognised and printing on the wrong
side of the card can be avoided.
The direction detector works with a reflective light sensor. The position and distance of
black marks on the card are measured. The application program interprets this
measurement and decides whether or not the card is in the correct position.
Reading Position
The light sensor for direction detector is built-in at the right bottom side of the printer.
Thus the card must be inserted into the printer with the direction marking ahead (on the
right, bottom side of the card).
(The TRW print is always carried out on the top side of the card)
7.2 Processing
A maximum of 4 markers are measured. Each measurement value is the distance
between the card edge and the centre of the current marker.
If fewer than 4 markers are present, the measurement value of the absent markers is
set to 0. The resolution is approx. 0.2 mm. (1 mm
≅
unit value 5.)
Due to variation, the measurement values of a card can deviate from the standard by
+/- 3 units. In addition, cards are usually subject to further manufacturing variations.
When analysing the measurements in the application program, care should be taken to
allow an adequate tolerance range for each value.
7.3 Card Design
The function of the direction detector is based on the comparison of the position of
optical markings with the debit value in the software. In order for this activity to work
reliably the following must be assured when the card is designed:
The markings in the diagonally opposite edges of the card must be designed in such a
manner that printing in this area cannot result in an incorrect interpretation of the card
position.
7.4 Command Sequence
Reading of marking measurement values:
<ESC> #
Response of the printer e.g.:
25405500<CR>
2 digits build one measurement-value:
1. mark = 25
≅
5mm
2. mark = 40
≅
8mm
3. mark = 55
≅
11mm
4. mark = 00 not present
User Manual
page 36 / 40