Printer or other automatic printing system with additonal control unit and said control unit

The invention relates to a printer or other printing systems for computer output units, especially ink-jet printing systems, with at least one print head 2, a refillable or replaceable ink tank or tank system 4, a pressure electronics 6 and possibly a hose system 3 and a control unit, wherein in or a communication system 8 is arranged on the printer 1, which has means for generating, transmitting, blocking, simulating and / or processing various signals, pulses, information or data and wherein the communication system 8 optionally has connection systems 82 and is designed as a detachable communication element 81 and within data lines 7 between the pressure electronics 6 and the tank system 4 and / or coding systems 5, 5 'is arranged. A control device for this is as a communication system 8,