Short range serial data link.

What is the cheapest way to set up a short range (200m) serial data link? Also, what are the best options for secured and unsecured links?

whatsisface8 years ago
I think an XBee is your best bet. What is it being used for?

There's an instructable on serial data between two picaxe's here:

https://www.instructables.com/id/Build-a-500-metre-radio-data-link-for-under-40./