[PD] stepper message syntax (pd through arduino)

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hia. ((iohannes, sorry for the hijacked thread, its an old tic that  
saves me time figuring out the email account subscribed to the pd- 
list and avoid bounces, and since I changed the subject line the  
mailserv shouldnt detour to an older thread :/ ...anyways.....))

anyone around who understands how can one send control data to a  
stepper motor via the pduino aka firmata?

i guess i have to send a message with few values at the same time:  
direction, speed, number of steps??

any help appreciated.

/a