Modbus RTU not working with transceiver and nanopi neo core


I can use the modbus RTU binding when I’m using a USB dongle but my problem is that it doesn’t work when I’m using a transceiver with my nanopi. I think it could be because this transceiver needs a RTS control line. I couldn’t find a solution in the forum so I wrote my own post. Can you help me please?

Thank you.