Hello.
I try to connect my paspbery pi to ATMega8 with RS485.
I double checked port settings. Settings -ok(all the same).
Please let me know what this code mean?
May be it help.

]]>https://forum.mango-os.com/topic/2238/illealfunctionexeption-code-0x7fRSS for NodeThu, 18 Jun 2026 14:56:20 GMTWed, 04 May 2016 23:14:38 GMT60Illegal Function generally means you are trying to read a slave device with a function code that is not supported by the device or in the modbus spec. You might try reversing your RS-485 wires or checking your code because I'd be surprised if 7F was a valid function code. The more common function codes are 03 and 04.

]]>https://forum.mango-os.com/post/11604https://forum.mango-os.com/post/11604Thu, 12 May 2016 14:26:23 GMT