I have an existing 10 SLC 5/04 connected via DH+ protocol. I want to put a wireless radio using prosoft technology as a back up to DH+ system.My client needs a back up communication system due to the failure of DH+, so i recommend them to put a wireless radio as a back up without touching their existing network and replacing their existing SLC processor, my question is that possible to have a different protocol at the same time in a network? IF the DH+ fails the wireless radio will act as a back-up, do i need to modify the existing program? Can you give us a sample ladder logic program on how to address this problem? Your immediate response would be highly appreciated.