18
|
ni.com
|
NI 9512 Operating Instructions and Specifications
Many stepper drive manufacturers offer opto-isolated inputs for
Step (CW)/Direction (CCW) signals. When connecting to
opto-isolated inputs, configure the Step output type to
single-ended, connect the NI 9512 Step+ output to the negative
(cathode) side of the optocoupler input, and leave the Step- output
on the NI 9512 disconnected. Connect the positive (anode) side of
the drive input to a supply as specified by the drive manufacturer.
Figure 6 shows a single-ended connection example.
Figure 6.
Opto-Isolated Step and Direction Output Connection
Encoder Signals
The encoder channel consists of a Phase A, a Phase B, and an Index
input. The NI 9512 supports RS-422 differential and single-ended
inputs for Phase A, Phase B, and Index signals, and provides a
+5 V output for encoder power. National Instruments strongly
recommends you use encoders with differential line driver outputs
NI 9512
S
tep+/Dir+
Drive
S
tep+/Dir+
S
tep–/Dir–
+5 V
No Connection
S
tep–/Dir–
