Ndrive HL 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 HL (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 Ndrive HLs since each Ndrive HL standardly has one
analog input.
Subsequent drawings illustrate how to connect a single axis and a two-axis joystick to the
Ndrive HL in various ways, and the cables required to so do. A two-axis joystick
requires an Ndrive HL with the –IOPSO option, form two analog inputs or two Ndrive
HLs, each with one analog input.
When using an external potentiometer (such as a joystick) to drive the Ndrive HL 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 minimum and maximum 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 Ndrive HLs are being used to read the joystick, only one Ndrive HL
should be used to provide 5 Volt power to the potentiometers. The second Ndrive HL
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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