The cash drawer is triggered via the peripheral port on the back of the HP A799. Go to Printer Properties > Device Settings and ensure the "Peripheral Unit 1" or "Cash Drawer" action is set to trigger "Before Printing" or "After Printing". To help find the right driver configuration, tell me: What operating system is your computer running? What Point of Sale (POS) software are you using?
Understanding the hardware capabilities ensures you choose the correct print density and fonts in your POS software settings. Specification Direct Thermal Print Speed Up to 250 mm/second (9.8 inches/second) Resolution 203 DPI (8 dots/mm) Media Width 80 mm standard (58 mm supported with adapters) Interfaces USB 2.0, PoweredUSB, or Serial (RS-232) depending on model Barcodes Supported hp a799 thermal printer driver download link
Plug the power cord into the wall wall socket and connect it to the printer. The cash drawer is triggered via the peripheral
Right-click the saved .zip or compressed installer file and choose . What Point of Sale (POS) software are you using
The HP A799 Thermal Receipt Printer is a workhorse in retail and hospitality environments, known for its high-speed printing and monochrome thermal reliability. However, to keep this Point of Sale (POS) peripheral functioning correctly on modern operating systems, installing the correct driver is essential.