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bbqkees / Nefit-Buderus-EMS-bus-Arduino-Domoticz

Readout of EMS protocol datagrams and transfer of data to Domoticz via Arduino
MIT License
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Rx Tx label #12

Closed nsine-zz closed 5 years ago

nsine-zz commented 5 years ago

Is it possible that the rx & tx label on the v0.9 board is switched? I have to connect the rx pin from the ems module to the rx pin on the arduino mega to get the whole thing working.

bbqkees commented 5 years ago

It is not switched. Indeed connect RX of the board to RX of the Mega. It's also noted like that in the instruction sheet included with the board. If you connect two devices via a serial port directly you would indeed normally connect the RX from one device to TX from the other. However, the board is basically only a logic level shifter. So you need to see it as an extension of the controller, not as the other side. At least, that was my idea behind it.

nsine-zz commented 5 years ago

Ok, thank you for sorting it out.