DAEnetIP2
User Manual
12 Sep 2013
16.
Appendix 9. Digital I/O ports (P3/P5)
This section describes how to use DAEnetIP2 P3/P5 - 8 bit TTL IO port lines.
They are not buffered and you should very carefully otherwise the MCU could
be damaged.
They are digital inputs/outputs. The output level voltage is “1”
(3.3VDC) or “0” (0.25VDC) with consumption < 1.5mA. All inputs/outputs have
protection diodes to GND and +3.3VDC.
Below are given sample examples of I/O ports connections to external devices.
The first figure shows how to connect digital output to 12V relay. The second shows
example for 5V TTL signal input. R2 is recommend because sometimes the input
signals are ‘tri-state”.
Figure 38. Connecting relay to digital output
Figure 39. Using digital I/O pin as input
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