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

You could use a transistor, but not the circuit you posted.  I'd recommend instead using an optocoupler with the LED triggered by the 12V circuit and the output phototransistor connected between the I/O pin and ground with a 10K resistor connected from the I/O pin to +5V.  The input is low if the LED is on and high if the LED is off.

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