LEadshine DM556 stepper driver via RS-232

Hi all!
i wonder if there is possible to drive stepper motors with arduino via RS-232.

I have a Stepper driver leadshine DM556:

http://www.leadshine.com/UploadFile/Down/DM556m.pdf

and i found the pinout for his rs232:

http://www.leadshine.com/UploadFile/Down/RJ11%20Connector%20for%20RS232%20Communication.pdf

The problem is that i can't find the protocol (commands) that i should send via serial for
control the motor.

I wonder if is this possible to drive the motor sending serial instructions instead pulses for step/dir

Thanks in advance!!

Daniel