RS485 doesn't work for receive data

Ayrat

I have an AIO-3568JQ mainboard. I try it to connect to a sensor over RS485 interface. I can send data, but I can't receive. I checked it with a logic analyzer on CA-IS3082 chip (3, 4-5, 6 pins). TX changes, RX and RE-DE doesn't change level at all. Also I connected an USB-RS485 converter to check from another PC. I couldn't find any schematic how does it turn the RX on. And I couldn't find any GPIO which can flow control on UART5 in iCore-3562JQ_Specification document. I think there is a GPIO which I can control the flow with.