I hate using RJ45 connectors for DMX. They just don’t have sufficient mechanical strength. 3 pin ( I know soap and water in some quarters) and 5 pin Cannons are great but a bit pricing.
DMX wasn’t really planned for exterior use, I base this comment on the fact that no weather proof connectors are recommended.
So what to do?
Last season I cut a heap of weatherproof 3 pin male and female connectors off my LED light strings – they look ideal for the solution.
I figured if I keep the same pin out as a Cannon 3 pin connector as in the table below, everything should be sweet.
DMX Connections used by most Christmas Lights