Advantech PCI-1240, User Manual

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27 Chapter 3
3.9 External Pulse Control Input (nEXOP+, nEXOP-)
The pulses output function of MCX314/MCX314AS chip is controlled by
register setting or by external pulse command input (nEXOP+, nEXOP-).
There are two output pulse mode for the external control pin. One is fixed
pulse output mode, and the other is continuous output mode. In PCI-
1240/PCI-1240U, it provides Jog and Hand wheel functions that allow
you driving motors through external Hand wheel or Jog equipment. In
Jog mode, it is corresponding to the “Continuous Output Mode,” and in
Hand wheel mode, it is corresponding to the “Fixed Pulse Output Mode.”
These functions are progressed without CPU involved on host PC. When
the input signal is enabled during fixed pulse drive, the pulse specified
will be output. When continuous output drive is enabled, the drive pulse
will be continually output at the period of signal Low. This signal should
be used in combination with external power DC12 ~ 24V. The response
time of circuitry should take about 10 msec because of the delay of photo
coupled and RC filter.
Figure 3.14: Circuit Diagram of the External Drive Operation Signals
Figure 3.15: Example of Connecting to Jog
MCX314
3.3K
100K
0.01
μ
VEX(12~24V)
+5V
TLP121 or eq.
10K
+5V
3.3K
100K
0.01
μ
10K
nEXPP
nEXPM
nEXOP+
nEXOP-
74HC14
Control
Logic