A printhead assembly with a communications module for a wallpaper printing system, the printhead assembly comprising: a casing; a printhead module; a fluid channel member positioned adjacent to the printhead module, the fluid channel member including a plurality of ducts that substantially span the length of the printhead module; a power supply connection port positioned at a distal end of the casing, the power supply port electrically connected to at least one busbar that substantially spans the length of the printhead module; a fluid delivery connection port positioned at a distal end of the casing, the fluid delivery port in fluid communication with the fluid channel member; and, a data connection port positioned at a distal end of the casing, the data port electrically connected to at least one printed circuit board positioned within the casing, the at least one printed circuit board further electrically connected to the printhead module.