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MDriveAC Plus Microstepping Hardware - Revision R031808
Relevant to Firmware Version 3.0.02
Optocoupler Reference
The MDriveAC Plus Microstepping Logic Inputs are optically isolated to prevent electrical noise being coupled into
the inputs and causing erratic operation.
There are two ways that the Optocoupler Reference will be connected depending whether the Inputs are to be
configured as sinking or sourcing.
Optocoupler Reference
Input Type
Optocoupler Reference Connection
Sinking
+5 to +24 VDC
Sourcing
Controller Ground
Table 2.1.2: Optocoupler Reference Connection
NOTE: When
connecting the
Optocoupler Supply,
it is recommended
that you do not use MDriveAC
Plus Power Ground as
Ground as this will defeat the
optical isolation.
Constant
Current
Source
Optocoupler
+5 VDC
To Drive Logic
Optocoupler
Reference
Input
(Step Clock,
Direction, Enable)
MDriveACPlus
Microstepping
Figure 2.1.4: Optocoupler Input Circuit Diagram
