Appendix 5. I/O Ports (Daenetip2 P3) - Denkovi DAEnetIP2 User Manual

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Appendix 5. I/O Ports (DAEnetIP2 P3)

This section describes how to used DAEnetIP2 P3 - 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 connection with 12V relay. The second shows example for 5V
TTL signal input. R2 is recommend because sometimes the input signals are 'tri-
state".
DAEnetIP2 Eight Relay Module LM35DZ User Manual
Figure 20. Connecting relay to I/O pin
Figure 21. Using digital I/O pin as input
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