P-9904 Printer Interface Card is an optional card for GST-IFP8 control panel, providing an interface for USB printer. Recommended printer: EPSON LQ-590K needle printer. P-9904 Printer Interface Card should be fixed in the cabinet of a control panel. The USB printer can be connected through USB cable to print messages from the control panel. Powered by 5VDC from power board, P-9904 communicates with the control panel through ribbon cable.