I think you will have to do some formatting... If you look under the downloads page on this website and find 'AR4 Serial command examples' it shows some of the conversions from command line to serial commands.
I've never played around with anything like that so let us know if you figure it out!
Click 'Home J1' then use 'get last command' - I'm away from my main PC but they are called something similar
That should show the command line to home just one axis.