Motion Coordinator Technical Reference Manual
Daughter Boards 4-13
Servo Encoder Daughter Board
the V- pins should not be referenced to different external voltages. Screened
cable should be used for the voltage output connection and the screen connected
to the metal case or backplate. Do not connect screens to the registration 0V
terminal.
Registration Input
The registration input is a 24v dc input connected through high-speed opto-isola-
tion into the encoder counter circuit. An alternative 5v input pin is available on
the encoder port. The internal circuitry can be used to capture the position at
which the registration input makes a transition from low to high or vice-versa.
This function is accessed in software from the REGIST command. The input is
measured relative to the 0v input on the servo daughter board which must be
connected if the registration input is used. Note that this is the same 0v as the
encoder port.
Software
Considerations:
The servo function can be switched on or off with the SERVO axis parameter:
>>SERVO =ON
When the servo function is OFF the value in the axis parameter DAC is written to
the 12 bit digital to analog converter:
Note:
To maintain compatibility with earlier products, the daughter board hardware
inverts the voltage relative to the DAC parameter.
>>DAC=2047
This will set -10 volts on voltage output when servo is OFF
>>DAC=0
This will set 0 volts on voltage output when servo is OFF
>>DAC=-2048
This will set 10 volts on voltage output when servo is OFF
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