Modbus RTU stop working in SL

[jose_dli]

Yes, I rewire from SL to the nearest meter, and tried with the tool "read test" but it doesn't work. I can't check if the device damage is SL or meter. 

Is there any way to check if the port RS485 is broken in the SL?. And SL works with any chip RS485 usb external?

Thanks for your help,