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Description of control unit MEL64/65 Service manual M695
03/93 3077-HWE Doc code 636 718
ControI LEDs
Motorized focusing
The function display tells you whether the signals from the footswitch or
handswitch are being correctly received and interpreted:
for FOCUS UP
for FOCUS DOWN
for CENTER POSITION
The handswitch or footswitch transmits on RD_2 or RD_3 the codes which
correspond to the functions:
Data format:
ASCII 8-bit with start bit
repeating at 2.3-millisecond intervals
+5V/-8V
The logics on the receiver board (processor) assign the received codes to their
appropriate functions:
FOCUS UP
FOCUS DOWN
CENTER POSITION
The control signals (0V/5V) for FOCUS UP and FOCUS DOWN reach the
logics board in the microscope via the swingarm cable.
Presetting the focusing
displacement speed
The voltage level of FOCUS SPEED depends on the setting of the potentio-
meter on the panel board.
min. FOCUS SPEED
max. FOCUS SPEED
Zoom position 25
0.5V-0.7V
2.1V +-5%
Zoom position <8
1.25V-1.7V
5V +-5%
5-18