I’m want to couple my ventilation unit to my MKR1000. Before I hook them up I wanted to be sure the RS485 levels are at 3.3V, as I read the MKR1000 does nto cope with 5V.
The ventilation unit uses a 75176B chip. From the specs I think to understand it operates at 5V. So I think I can build a voltage divider with 2 resistors to get 3.3V.
But my main concern now is when I read out the input voltage on the 75176B chip, it is 14V. Is this possible? Does this mean the signals are also of a highr voltage? When I read the tension between A and B I read around 2.7V but I guess this is not representative since the voltage might peek during signals?
So, to help me not to fry my new MKR1000 :
-Is this 14V an issue?
-Do I need the voltage divider?
-Is it safe to assume it is 5V now?