All bits of a position are transferred simultaneously using one line for each bit. Data transmission is done by two transistors in a push-pull circuit.
For example, the signals can be evaluated via digital entries of an PLC. The conversion from Gray to binary code has to take place in the control system, since the code of this method is transmitted directly.
The bit parallel interface is a very fast and, for low resolutions, cheap means of data transmission. For high resolutions or machines of bigger size, installation costs can rise rapidly such that other methods of data transmission are more favorable.