NI SMD-7613/7614/7615/7616 User Manual
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© National Instruments
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17
STEP and DIR Inputs
The drive includes two high speed inputs called STEP and DIR. They accept 5 volt single-ended
or differential signals, up to 2 MHz. Normally these inputs connect to an external controller that
provides step & direction command signals. You can also connect a master encoder to the inputs
for following applications. The following section demonstrates example signal connections.
Refer to
Motor Wiring Recommendations
for cable instructions.
Figure 14.
Connecting to Indexer with Sourcing Outputs
Figure 15.
Connecting to Indexer with Sinking Outputs
Figure 16.
Connecting to Indexer with Differential Outputs
Indexer
with
S
o
u
rcing
O
u
tp
u
t
s
S
TEP
DIR
+5V OUT
IN/OUT 1
X2/DIR–
X2/DIR+
X1/
S
TEP–
X1/
S
TEP+
Indexer
with
S
inking
O
u
tp
u
t
s
S
TEP
DIR
+5V OUT
IN/OUT 1
X2/DIR+
X2/DIR–
X1/
S
TEP+
X1/
S
TEP–
Indexer
with
Differenti
a
l
O
u
tp
u
t
s
S
TEP-
S
TEP+
DIR–
DIR+
IN/OUT 1
X2/DIR+
X2/DIR–
X1/
S
TEP+
X1/
S
TEP–
