The only thing you have to watch with a solid state device is the polarity.
The + mark on the Powerflash case is the polarity for a DC input.
When in the dry contact input. The internally generated sensing voltage - is on the terminal marked + and sensing voltage + on the terminal marked -.
My ELK930 Doorbell Sensor didn't work until I found the polarity reversed. As it uses a opto output and steals the power to run it from the sensing voltage of the Powerflash Module.