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4.0 Control input and output
The following sections describe ACU2 (v2) control input and output specifications.
4.1 Control input
The control inputs are contact sensing; no voltage is required. Connect the control input and
control input ground lines together using a switch or other suitable device, such as a press-to-
talk (PTT) device. The control input can function as a digital input or an analog input. In both
cases, the ACU2 (v2) component in the model will be able to read the control input value and
use this value as required for the application.
Figure 14: Control input timing diagram
The control input can be used as an analog input by inserting a resistance between the control
input and control input ground pins. With this configuration, the ACU2 (v2) component in
the model maps the voltage to a uint8 value that you can use to model your application. For
example, the four-channel selector knob contains a switch that changes the resistance between
the control input and control input ground pins. The uint8 number read in the ACU2 (v2) soft-
ware component varies by a given percentage based on the tolerances of all the components
involved.
Figure 15: Four-channel selector knob
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ACU2 (v2) Technical User Guide (Rev. A, Ver. 0)