Read Serial (RS485) Data

[v1rtus]

Hello,

I have no success to read data from RS485 port (orange one). I use NODE-RED for building flows.

To make sure that it is not issue in any configuration I used USB->RS485 adapter and I had success to read data.

There are two serial available when execute

Code:

dmesg | grep tty

1. /dev/ttyS0
   
2. /dev/ttyAMA0
   

I assume that /dev/ttyAMA0 is the right one to use but when I try to read data the response is "Modbus Failure On State sending Get More About It By Logging"

Could someone help me with that? I can read data if I use USB->RS485 adapter but not trought the built-in RS-485 port (orange one).