Intab PC-Logger 3100i How To Use Manual page 34

3.2.1 Opto Isolated
The opto-isolated 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.
PULSE
MAX 24V
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.
TTL/CMOS
1
AND/OR
34
DI b
DI a
OPTO ISOLATION
ANY POLARITY
2
INTAB Interface-Teknik AB
OR
GND
GND
P2
P1
Vp
Vp
VO
GND
DI a
DI b