A printing system including printing equipment in which, even if the equipment are interconnected through an interface pursuant to the IEEE 1394 standard, the printing image may be set to effect printing. The preferred fluorescent protein sensors are variants of the green fluorescent protein from Aequorea victoria. The method further includes removing, by mechanical machining, conducting material from the thus shaped conducting layer. The signal comprises a pulse added to each line of the signal throughout both the visible picture region and throughout the vertical blanking region, as well as a first modulated wave-form added to the vertical synchronization pulses of the signal and a second modulated wave-form added to several lines of the picture signal before the vertical blanking section.