I have  connected my PTZ  canon VCC4 on usb port on my laptop ( using a mini-din 8 pin ->serial cable and then using a serial->usb adaptor)
But I have a problem to use Ptz with playerv. When I subscribe the device with playerv, I can command ptz for only few seconds and then the led on camera becomes red and I get this error message: "SendAbsPanTilt  errored. bailing"
After then, ptz remains in stop status even if I try to command it with playerv.
Somebody can help me ?

 I can't find documentation about canonvcc4 driver on playerstage internet site. why ?