Descriptions 10-9
Centrifuge 5804/5804 R and 5810/5810 R
10 Descriptions
Assembly group operation / display
Keypad
The keypad request is done by a resistor matrix that contains tactile switches. By pressing a key a
certain voltage divider is generated. The voltage value is either higher than TZ1 or TZ2 at the analogue
inputs PORT 8.0, 8.1. To each key a certain voltage value is assigned.
Display
The display is an LCD module with a driver/decoder and background illumination. The intensity of the
illumination is fixed. The brightness of the display can be set at the potentiometer POT1.
The control of the display is done by 3 control lines and 8 data lines.
– control lines EN from PORT 4.5 enable signal for the driver
RW from PORT 4.6 read / write command
RS from PORT 4.7 selection whether the incoming byte (DB0...DB7)
is a control command or a data byte
– data lines DB0...DB7 PORT 5.0...5.7
The standstill of the device and the readiness to open the lid of the centrifuge is indicated by the "OPEN"
LED LED1 (PORT 4.2).
The buzzer SUM1 signals the completion of the centrifuge run or a fault during the centrifuging process
(PORT 1.1).
MSTM/KW/0408
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