[dantheperson@danski empeg-car]$ ./emptool --serial /dev/tts/0
2000 Checking connection [Done] 2121 Downloading
[...snip...]

[root@danski empeg-car]# ./emptool --serial /dev/tts/0
4001 Failed to open device /dev/tts/0, errno:2

2 is ENOENT, file not found. What exactly are the permissions on /dev/tts/0? Isn't that a devfs filename? in which case I expect you should be complaining to Mr Gooch on linux-kernel (it seems you might as well; everyone else on linux-kernel does).

Peter