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Topic: Schneider IHC IO modules - Modbus (Read 412 times) previous topic - next topic

bartmarchand

I've connected the output of the arduino directly to the datainput of the IHC outputmodule.

Same for the input, I connected the dataoutput of the IHC intputmodule directly to the input of the arduino.
Do I need to place a pull up resistor on the input of the arduino?

mikb55

Do I need to place a pull up resistor on the input of the arduino?
If you see TTL voltage levels on the oscilloscope trace then, you don't need a pull up resistor.

bartmarchand

So strange:

IHC inputmodule connected to IHC outputmodule: OK

Arduino BasicOutput connected to IHC outputmodule: OK

Arduino BasicOutput connected to Arduino BasicInput: OK

IHC inputmodule connected to Arduino Basicinput: NOK

I'm lost...

bartmarchand

I did some scope measurements, signal is exactly the same.

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