Description of control unit MEL64/65

Service

manual M695

09/93 3077-HWE

Doc

code 636 718

 

 

 

 

Control LEDsUsing the motor to set the zoom position

The function display tells you whether the signals from the footswitch or handswitch are being correctly received and interpreted:

for ZOOM UP

for ZOOM DOWN

The handswitch or the 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

+5W/-8V

The logics on the receiver board (processor) assign the codes received to their appropriate functions:

ZOOM UP

ZOOM DOWN

Presetting the zoom displacement speed

The control signals (0V/5V) for ZOOM UP and ZOOM DOWN reach the logics board in the microscope via the swingarm cable.

The voltage level of ZOOM SPEED depends on the position of the potentiometer on the panel board.

 

Level of ZOOM SPEED

min. ZOOM SPEED

2.10V +- 0.25V

 

 

max. ZOOM SPEED

5V +- 5%

 

 

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