I have read a few forums/documentations about that topic, but I thought I still double check with you juts to confirm that I understand everything right.
So I basically would like to connect an RS485 device to my arduino UNO while I still would like to communicate(send data) with my computer. My RS485 device would be a modbus RTU slave. I tried two different classes to pull data out from it:
I have read that I can not use the rx tx (digital 0,1) channels if I use the USB as well. Before I known that I already tried and I do get signal on my RS485 device and on my PC as well, but I do not get any proper reply.
So the question is, do I need to use anything like that: mini RS485, would that be even something that I need to use? Or is it possible to do it without any extra components?
Would it be better if I go for an Arduino Mega?
For the final idea I will not need to communicate via USB as the data would be saved on an SD card which I would just remove when ever I want the data. Right now the USB connection is mainly for testing.
I guess it would be easier to just save the data which I receiver on an SD card without the USB connection and check if the data is right on the SD card or not for debugging. It would be slower, but then I would not need to change the board or ad any extra RS485 stuff.
Any comments/ideas will be appreciated, Regards Daniel