Documentation for Vex Link can be found Here
Instructions on how to make a wireless connection are supper clear and easy to follow
To make a wired connection:
You must modify the smart cable by cutting the power wire (for me it was the yellow, most likely yours will be the same).
I didn’t cut the ground and it hasn’t given me problems so far
Also remember there is a forth parameter that defines if the connection is wired or wireless this defaults to false which means the connection is wireless. For a wired connection you must specify true.
Example for wired connection:
vex::serial_link LinkB(PORT20, “vex_robotics_team_1234_B”, linkType::manager, true);