I have a pool controller that talks RS485 that I want to monitor and hack into so I can control it from an Arduino. I've prowled all over the net and haven't found a description of someone that has done this. I'll need to monitor the communication for a while to build up data on the comm protocol and then start injecting commands until I'm comfortable that I can control it.
Suggestions on RS485 adapters, shields and such would be appreciated. I plan on interfacing this to an Xbee and going wireless so I don't want to tie up pins 0 and 1 on the arduino. Heck, I might get lucky and be able to do it directly off the Xbee if there is something out there that can do the serial TTL to RS485 conversion for me. Isn't that what the Xbee transparent mode was designed to do?