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LTPH245 Fiches technique(PDF) 43 Page - Seiko Instruments Inc

No de pièce LTPH245
Description  LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE
PDF  64 Pages
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Fabricant  SII [Seiko Instruments Inc]
Site Internet  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

LTPH245 Fiches technique(HTML) 43 Page - Seiko Instruments Inc

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3.8
PLATEN POSITION SENSOR
The printer has a platen position sensor to detect whether or not the platen block is set.
The platen position sensor is a switch type sensor shown in Figure 3-13. The platen position sensor
switch is closed when the platen block is set and is open when the platen block is released.
Design the control circuit so that the motor is not driven and the thermal head is not activated when the
platen block is open by detecting output of the platen position sensor.
3.8.1
General Specification
Maximum rating: DC30V, 0.5A
Connection resistance: 200 m
Ω or less
3.8.2
Sample External Circuit
Figure 3-13 Sample External Circuit of the Platen Position Sensor
•
Note that there is a time lag between operation of the platen position sensor and
completion of pressurization to thermal head.
•
To prevent a malfunction due to chattering of the switch, be sure to use the capacitor
shown in Figure 3-13.
Switch
GND
CPU Port
Vdd (5v)
R=100k
Ω
HS
GND
C=0.1
µF
* When the platen block is open
LTPH245



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