© ElectroCraft 2022
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High Power Universal Drive User Manual
9.3
Digital Inputs and Outputs
9.3.1
Digital Input Circuit
Capture Input
The capture input provides a snapshot of the encoder counts accumulated to that point. It is triggered on
a falling edge of the input signal. If a digital interface is used, the capture circuit is compatible with either
push-pull or open collector (internal pull-up is present in the drive). It is recommended that for higher
frequency capture triggering, a push-pull interface should be used. See section 4.3.7 for more information
regarding electrical specifications.
+3.3V
+3.3V
Digital
Input
R
C
100
K
Figure 21a: Digital input circuit for Capture, Enable, Brake and Limit Switch Inputs
For Enable, Brake, Limit Switch Pos, & Limit Switch Neg:
R= 20KΩ and C = 4700pF.
For Capture:
R=10KΩ and C=5pF.
Step & Direction Inputs
See section 9.1 for functional application regarding step & direction inputs. The states of these pins can
be monitored in CompleteArchitect
. There is the option to set the steps per revolution in
CompleteArchitect
. The software will divide the Desired Steps per Rev. into the Encoder resolution.
For high frequency stepping a push-pull interface is required. The drive includes a pull-up on the internal
circuit and can be interfaced to an open collector for low frequency stepping. See section 4.3.7 for more
information regarding electrical specifications.
Digital
Input
+3.3V
+3.3V
BAS16
100K
1K
Figure 22b: Digital input circuit for Step & Direction Inputs
9.3.2
Digital Output Circuit
+5V
Digital
Output
590
47V
Figure 23: Digital output circuit
