I have a project coming up that requires serial data comms across a large vehicle with two trailers connected in train. The total length of the vehicle is 100ft, and I need to install several nodes along the length of the vehicle that all need to communicate with the master node at the front.
I plan to use RS485, and have no problem using proper twisted pair cable throughout the body of the trailers.
My concern is connecting across the drawbars of the trailers. Ideally I want to use a standard 7 PIN trailer lights connector because of its robustness, and the availability of a curly/stretchy cable that expands and contracts as the vehicle travels around corners, but this is not twisted pair!
I can use a low baud rate as I’m only transmitting commands, not huge amounts of data.
Will it still be reliable if a section of the data line is not twisted pair?