Usually, there aren’t any. At the DLC32, it uses one of the I2C pins, if I remember correctly. But you could choose any pin that is available to control a relay. Otherwise, don’t define those pins.
I use
stepping:
engine: RMT
idle_ms: 25
pulse_us: 4
dir_delay_us: 0
disable_delay_us: 0
segments: 12
successfully with my Sculpfun S30 boards.