How-To: Modify Marlin to control a laser with an SKR Pro - SKR

The touchscreen is in serial mode, I have all three cables hooked up. I will try disconnecting one set tomorrow and see if that helps, thanks for the suggestion.

Wiring Endurance lasers to TOP popular boards (3D Printers) - EnduranceLasers

BIGTREETECH® SKR Pico V1.0 Motherboard

BigTreeTech SKR Mini E3 V3.0 - NotEnoughTech

SKR MINI E3 V3: Analysis and complete guide of this new electronic board revision - 3DWork

BIGTREETECH SKR Pro v1.2

BIGTREETECH SKR PRO V1.2 Control Board Marlin 32 Bit Motherboard For TFT35 V3.0 TMC2209 Driver VS SKR V1.4 Turbo MKS GEN L Board - AliExpress

New SKR mini E3 V3 board : r/ender3

Ender 3 Pro - Should I stay with my BTT SKR Mini E3 V2.0 board or change to stock for running Klipper? : r/klippers

BTT SKR Pro V1.2 Setup Guide - UART, BLTOUCH - Make 'N' Print

How to set up the SKR 1.3/1.4 Board with the K40 Laser - LightBurn Hardware Compatibility - LightBurn Software Forum

Dual axis for X and Y and auto squaring on SKR PRO 1.2 · Issue #46 · grblHAL/STM32F4xx · GitHub

BIGTREETECH SKR V1.4 Control Board 32bit Upgrade SKR V1.3 Motherboard, Compatible TFT35/TFT35 E3/TFT70 Touch Screen Mini12864 LCD Support TMC2209/EZ2209/TMC2208/TMC5160 for Most FDM 3D Printer : Industrial & Scientific