In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

Hello,

   RS-485 provides the interface specification, but has nothing to do with the communication protocol or speed.  Regardless of interface (RS-232, RS-422/485) you cannot get reliable serial communications from the internal OSC.  You will need an external resonator or crystal for proper timing.  I hope this helps.  Take care.

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