Parker Hannifin
Drive Function
This section describes the drive function of the Axis interface, as well as an
AcroBASIC command reference, signal assignments, electrical/timing
characteristics, and internal circuit schematics.
Modes of Operation
The Drive Step and Drive Direction output feature of the drive interface has
two modes of operation:
• Step and Direction
• CW and CCW Mode
Step and Direction Mode
In Step and Direction mode, two differential output signals are driven to an
external drive: STEP and DIR. A high DIR signal and a positive edge of the
STEP signal indicates a request for positive motion while a low DIR signal
and a positive edge of the STEP signal indicates a request for negative
direction. On the connector, Drive Step and STEP use the same pins and
Drive Direction and DIR use the same pins.
CW and CCW Mode
In CW and CCW mode, two differential output signals are driven to an
external drive: CW and CCW. A low CCW signal and a positive edge of the
CW signal indicates a request for positive motion, while a low CW signal and
a positive edge of the CCW signal indicates a request for negative direction.
Only one output will transition at a time. On the connector, Drive Step and
CW use the same pins and Drive Direction and CCW use the same pins.
Drive Signal Assignments
Table 13 summarizes the drive signal assignments.
Axis Connector Mode
Drive Step Drive Direction
Step and Direction STEP DIR
CW and CCW CW CCW
Note: The drive signals will support either a servo drive or stepper drive on the same
connector.
Table 13 Drive Signal Assignments
38 ACR9000 Series Hardware Installation Guide
www.comoso.com
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