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Ndrive HP 10/20/30 User’s Manual
Accessories
www.aerotech.com 5-5
5.2. Joystick
Interface
The user may connect an Aerotech JI (not JBV, or JP4) joystick or their own joystick and
switches to the Ndrive (Refer to Figure 5-1). The joystick interlock input must be set to
the logic low state to indicate the joystick is connected. The zero velocity null-point for
each joystick is approximately 2.5 volts. Be sure to set the JoyStickMinVoltage and
JoyStickMaxVoltage task parameters. Also, the two potentiometers may be connected to
analog inputs on two different Ndrives since each Ndrive standardly has one analog
input.
Subsequent drawings illustrate how to connect a single axis and a two-axis joystick (both
single- and two-axis) to the Ndrive in various ways, and the cables required to so do. A
two-axis joystick requires 2 analog inputs (provided by the –IOPSO option).
When using an external potentiometer (such as a joystick) to drive the Ndrive analog
inputs, it must be manually calibrated.
1)
Set the joystick potentiometer at mid point (detent position) and record the
voltage from the Nstat window.
2)
Record the voltage at the maximum and minimum deflections of the
potentiometer. Subtract the two voltages.
3)
Set the
JoyStickMaxVoltage
task parameter to the mid point voltage from
step 1 plus 1/2 the voltage difference from step 2.
4)
Set the
JoyStickMinVoltage
task parameter to the mid point voltage from
step 1 minus 1/2 the voltage difference from step 2.
If two different Ndrives are being used to read the joystick, only one Ndrive should be
used to provide 5V power to the potentiometers. The second Ndrive should connect
differentially to the second joystick potentiometer by connecting the Analog Input- to
common and the Analog Input+ to the potentiometers wiper.
Figure 5-1.
Joystick Interface
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