Hey. I'm using RXTX's two way communication code example slightly modified to connect to an ARM 7 SRV1 robot. When i connect, and turn on the robot, i get an output in command line giving me the ##version. But i cant seem to get any commands processed by the robot. The code example is in the URL below.
 
http://www.pastesite.com/7000
 
The problem i can't understand is.. What exactly is the command sent as? an int thats say 8?  
a string of hex? say 4D323200 or something else to move forward? Would i change the variable or? I'm not sure.
 
Thanks

I'm sorry, i can't get my head around it.
 
Do you mean i would send in my code a String variable with the contents of:
 
the ASCII = M 50 50 00
Or the Hex = 0x4D 0x32 0x32 0x00
 
ie out.write("M 50 50 00");
or out.write("0x4D 0x32 0x32 0x00);
 
I just don't fully understand. Sorry.

There are only 4 bytes in the command.  The 'M' is the first byte.  If you send a '5', that has a hex value of 0x35 or decimal value of 53.  If you send a '0', it has a hex value of 0x30 or decimal value of 48.  There is no ASCII character with a value of 0x00.