The ZQ600 Plus Series printers also have a USB port. The 5-pin connector on the USB cable plugs into the printer. The connectors are keyed to ensure correct alignment; do not try to force the cable if it does not plug in. The other end of the cable must be plugged into the mobile computer or into a serial or USB port on a computer. The ZQ600 Plus Series printers are configured with the USB Open HCI interface driver, allowing them to communicate with Windows-based devices.