[. . . ] The port is a fully functional RS-232-C serial port that can be used as a standard serial port on your pen tablet. [. . . ] On one side of the adapter is a plug which fits into the system interface port (see Figure 1). On the opposite side of the adapter is a 9-pin port for a serial connector (see Figure 2). If the pen tablet is running, either suspend operation or power down the system. If the serial device you wish to disconnect has power applied, remove power. Note: When the Serial Adapter is attached to the pen tablet, the tablet cannot be used in the compact desk stand because the connector/cable assembly extends too far from the bottom of the system. The system should be held or laid flat when the Serial Adapter is installed. Figure 1. [. . . ] The system should be held or laid flat when the Serial Adapter is installed. Figure 1. [. . . ]