[PD] PDuino and servo control

[Фывапр Олджэвич]

 Dear List . 

I'm trying to control Servo FS5103r (continuos rotation servo) with PDuino 0.5 via Firmata which was included into Arduino 1.0.4. . I use PureData 42.5. 
 
I can't understand how to controll this servo. 
 
When i just send to the digital outpin 0 and 1 every 20 or 10 milliseconds - i can control the direction of the motor (forward and backward), but it is very unstable. Finally it ruins comport with 
 
[comport]: WriteFile:GetOverlappedResult error: 31
[comport]: WriteFile:GetOverlappedResult error: 1167
 
If i switch the pin to SERVO-mode in PDuino interface - the motor just starts to go in one direction (slowly) .. and i don't know how to turn it to another direction or how to switch it off.. 
 
Is there any tutorial on how to control servos with the PDuino ?
 
Thanks !
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