control of a vertical

Hello to all.
I need some help in controlling a vertical gantry using a s7-200 with only I/O digital ports and a ST400NT stepper motor control board. the gantry stops at different points due to opto-switches.
I would like to use distributed control where the plc tells the motor control board to start and stop. I am a novice at plcs so can someone please respond or it would be most appriciated if a sample code can be given to me
thank you(the board can be viewed on ....)
the board as one of its features can be controlled using serial link, can the s7-222 cpu with I/O control a motor controller board like that?