Read Serial (RS485) Data

[v1rtus]

I tried with another KC868-Server and unfortunately the behavior is the same

Steps that I did:

1. Installed Raspbian Lite
   
2. Installed Docker
   
3. Installed Portainer
   
4. Permissions for /dev/ttyS0 - sudo chmod 666 /dev/ttyS0
   
5. Deployed Node-RED container
   
6. Installed modbus module
   
7. Did configure modbus Read node and deployed it
   

The node is connected to the serial but when I try to read data from it it returns error - Modbus Failure On State sending Get More About It By Logging

   

I connect CM4 RS485 port to relay port as it is shown in video and try to read relay statuses.

Update:

After I switch to USB-RS485 adapter everything works fine.