The invention provides a chain saw attachment for unobstructed cutting of smaller objects with diameters less than three inches and larger objects with diameters greater than three inches. The platform may be capable of holding a sheet of material. An uneven joint portion is formed at the lower end of the winding stem, and is engaged with an uneven joint portion of the braking plate placed in the braking case. Embodiments of the invention are capable of detecting acceleration in a plane, along two orthogonal axes of acceleration, or along three orthogonal axis of acceleration. The fault message contains a fault information identifying a type of the fault. It is characterizing to the invention that all data intended to be transferred is arranged and stored in mutually identical arrays at the transmitting and receiving ends and that in the method data on the location of the data or the character to be transferred in the array is transferred preferably as a time data.