Welcome to the Technical Forum. Well there is more to the design than providing part numbers . Here are a couple articles on Reed switched you can review:
Here is another design guide I found for designing with reed switches:
Standex wrote that article and we do distribute for them. Here is a link to the Reed Switches we sell:
You will need to determine what you need. Hopefully the articles help you. A wireless device I found on the website that can tranmit and receive using the
RS232, RS485 would be 2170-DX80SR9M-H-ND. T Though there are many devices you can choose ont he website with your design. Here is the link to some finished products you might use in your design: https://www.digikey.com/short/7qv8j78r
Though you will need to do some research as there are so many considerations you need to review for your design.