Dear visitor, welcome to SPRINKLER TALK FORUM - You Got Questions, We've Got Answers. If this is your first visit here, please read the Help. It explains how this page works. You must be registered before you can use all the page's features. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.
]. I think what you are refering to is the plug in for the optional RMX-1 module, which operates a remote control. You can turn on the system by remote from the field for diagnostics and whatnot. I am not too familiar with Rainbird, but that is what I assume the port is for. This is a link for information about it.