© National Instruments
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3-5
•
CW and CCW modes produce pulses on the CW output for forward-commanded motion
and pulses on the CCW output for reverse-commanded motion. Refer to Figure 3-1 for an
illustration.
Figure 3-1.
Step/Direction and CW/CCW Modes
Step and Direction Output Circuit
You can configure the active state of both outputs in software as low or high. The active state of
the direction output corresponds to a forward direction. The step and direction output circuits
can be configured in software for either single-ended or differential output type. Refer to the
NI SoftMotion Module
book of the
LabVIEW Help
for more information about stepper motor
signal settings.
Caution
Do
not
connect these outputs to anything other than a +5 V circuit. The
output buffers will fail if subjected to voltages in excess of +5.5 V.
Caution
Do
not
connect any unused output lines directly to COM, +5 V OUT, or
V
sup
. Leave all unused output lines unconnected.
When connecting to drives with differential receiver inputs, configure the output type in
software to differential and connect as shown in Figure 3-2.
Figure 3-2.
Differential Step and Direction Output Connection
S
tep
Forward
Reverse
CW
CCW
Direction
NI 9512
S
tep– / Dir– O
u
tp
u
t
S
tep+ / Dir+ O
u
tp
u
t
Receiver
Drive
