AX-12 Woes

Well, I finally got my hands on a CM-5, thanks to the fine folks at CrustCrawler (which, incidentally, is where I got my two AX-12's to start with).

After hooking it up, I found out my AX-12's are perfectly fine. So, next thing I suspected was the UART on the robostix somehow got toasted. My brother made up an echo program that allowed me to test both UARTs, and they are both fine.

However, when I stick my cheapo Radio Shack logic probe on the bus wire, it stays high when I send the AX-12 a command if the AX-12 is plugged into the bus. If there are no servos on the bus, the data clearly gets transmitted on the bus wire, because I see the pulse light on the probe flash a bunch of times.

So, there's something about the mix of robostix and AX-12 that just don't seem to like each other. I'm kind of perplexed right now - I have no idea what could be wrong. I have a brand new ATmega128 board sitting on my desk here, but I don't want to plug it into the bus until I figure out what is going on...