Laser cutter PWM power adjust

Hi;

Hope this is the right section for the question.

I've recently got this laser to upgrade my 500mw laser cutter:
445nm 2.5W 2500mW Blue Laser Module With Heatsink For DIY Laser Cutter Engraver Sale - Banggood.com

The platform i'm using is a makeblock xy plotter which is controlled by an arduino variant called orion board.

The board has an output pin which spits out 12v PWM at 1khz.

Connecting the laser to the output didnt yield any results in terms of adjusting the laser power. The laser either on at 100% duty cycle or off completely anything below 100.

Searching about the product i found this image:



Where you can see the T+ and T- pins. I was wondering if it would be possible to adjust the power using 5v TTL?

Thanks.