Hello comrades, I recently received two MKR 485 shields for modbus RS485 serial communication (RTU) between my Raspberry Pi (Model 3 B +) and an arduino (NANO). What I would like to know is where the pins are located for communication on these shields (those where I send data as well as those which manage transmission and reception). On several forums and projects I saw that the main ports used are RE / DE anisi that RO / DI ... problem is that I would not be located these pins on the shield although RE would be on A5 and DE on A6 but RO and DI I do not see them unless it is the pins stamped Rx / Tx but to confirm to me: o ...
for additional info:
I use minimalmodbus to send data from the 7th pin (GPIO4) of the Rpi. The shield is not recognized by the Rpi when I try my program which only sends 1 or 0 to light up led 13 of the arduino.
For the nano I use the library: Modbus-Master-Slave-for-Arduino-master
There you go, I hope I was clear, if you want more details or any suggestion, don't hesitate :).
Thank you and stay safe.