Can the alarm output signal on a stepper driver be directly connected to an MCU

[Colotte]

Help!

The DM542 driver[OYOSTEPPER]. I want to connect it to the STM32's interrupt pin to immediately stop the device upon fault.

However, the driver power supply (36V) and the MCU power supply (5V) are not grounded. Should I add a secondary optocoupler for isolation between the optocoupler output and the MCU?

Or is the ALM output itself isolated and can be directly connected to the MCU via a pull-up resistor? The datasheet only states a maximum withstand voltage of 30V, without mentioning the isolation withstand voltage.

I'm worried about damaging the MCU. Could you please provide specific wiring instructions?