Using Parallel interface all bits of a position are transferred simultaneously using one line for each bit. Data transmission is done by two transistors in push pull circuit and conversion from gray to binary has to take place in the controlsystem, since the code of this method is transmitted directly. The bit parallel interface is a very fast and for low resolutions cheap possibility of data transmission. For high resolutions or machines of bigger size installation costs can rise rapidly so that other methods of data transmission are more favourable.