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

If you need to communicate with standard rs485 devices you will need
a rs485 driver chip because of the 120 ohm termination resistor.
This means a current of 5V/120ohm = 42mA. The sx I/O pins
cannot deliver this current.

regards peter

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