SiPy UART read with RS485 communication

[huynhvak]

Hello, I'm trying to communicate with an Arduino through a RS485 module.
Writing from the SiPy to the Arduino works, however the opposite doesn't.
When I try to read the UART, it either returns the TX buffer or nothing.

Here's my configuration :
RS485 RO <=> SiPy expansion board G24
RS485 DI <=> SiPy expansion board G11
RS485 Enable transmission/ Enable reception jumped together <=> SiPy expansion board G16

My code to set the uart and pin :

from machine import UART
from machine import Pin

uart = UART(1, 9600)
uart.init(9600, bits = 8, parity = None, stop = 1, pins = ('P3', 'P4') )#TX/RX

p_out = Pin('P9', mode = Pin.OUT)

I already checked if the signal is going through the RS485 and it does.
I don't know where the problem could be.

[bnjroos]

To enable reception you need to put your p_out to FALSE.