question

@Gamma1966, please thoroughly read the user manuals for both your BMV-702 as well as your MultiPlus. Using the relay-out of your BMV to control various functions of the MultiPlus is possible, but how to do it depends entirely on what you're trying to accomplish, and will require the use of Assistants and very careful programming through VEConfig.

Here, for instance, is a way to use SOC readings from the BMV, along with three Assistants, to tell the MultiPlus when to ignore and re-accept AC input:

https://www.victronenergy.com/live/dc_coupling:using_bmv_soc_in_a_vebus_assistant_setup

Here is a more complex and creative use of Assistants in general: https://community.victronenergy.com/questions/8933/example-of-using-assistants-partial-off-grid-boat.html

Overall, step one is to fully read and understand the user manuals for your devices, then step two is to identify what exactly you're trying to accomplish and then, once you have a firm grasp of how the two devices operate and what you want to do with them, come back to us and ask a specific question and we can almost certainly get you pointed in the right direction.

Thanks for the guidance and references.. I do not yet have the MP installed, just planning on how to manage the resources in my RV with this new system. I will have to spend time reading up on "The Assistants". I have not seen any mention of them in the Multipass Mannual, but I have downloaded the VE.Config software, so I assume when I start to use that I can learn more about the Assistants and general programming of the Victron equipment.