1. Where is the TTL port? I can only see the PWM?   
TTL and PWM is compatible and you can only choose one of them. It means that you can connect this module’s PWM port to the PWM (or TTL) port on the control board of your engraver. But make sure the voltage supply of that port is DC 5V.

2. How can I connect this module to the my engraver?    

If you don’t need the PWM function, you can directly connect the power port to Motor Port (12V, GND) on your control board and leave the PWM port unconnected.

3. Is the focus of this module adjustable?
This is a fixed focus module with fixed focus. We will send a focus adjustment aluminum column to help you determine the focus.

Note(Please pay attention):

1. Please wear laser goggles during usage and avoid touching the laser directly with your eyes and skin!

2. The warranty period of laser module is one month. If you have any quality problem(Except individual situation like using the laser module more than 30 minutes per time and casue the damage ), please feel free to ask our customer service for a help.

3. If your laser module has any problem, please DO NOT dismantle it without our permission. It will destroy the laser module.

4.  If you have any quality problem about the machine, please feel free to contact us. Many operative problem can be solved according to your video and problem description. Thank you in advance.

5. If you want to use on GKTOOLS machine, please connect the PWM plug . The PWM/TTL switch with light indicated is used for switching PWM or TTL mode.

Package Included:

7.5W Blue Laser Module * 1

Laser Protect Glasses * 1

2P Wire Line *1

3P Wire Line *1