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INTAB Interface-Teknik AB
3.2.1
Opto Isolated
The opto-isolated digital inputs can be used in two ways. Which method you
use depends on your particular application.
See figure!
The transducer marked "PULSE" has to be able to drive the input:
see 4.2.1 for levels and frequencies.
Remember that mechanical contacts always bounce when brought together.
This bouncing will, unless filtered, result in a burst rather than one pulse.
VO
GND
OR
DI b
DI a
PULSE
MAX 24V
OPTO ISOLATION
ANY POLARITY
DI a
DI b
3.2.2
TTL Compatible
The TTL-compatible inputs (P = Pulse in) are connected as in the figure.
Note that signal ground (GND) of the digital card has to be connected to signal
ground of the system or transducer that is used with these inputs.
GND
GND
1
2
TTL/CMOS
P1
P2
Vp
Vp
AND/OR