HP ProBook 6555b Notebook-PC - Manual (Page 106)

3. Click Stop, and then click OK.
4. Remove the device.
Using a serial device (select models only)
Select computer models include a serial port that connects optional devices such as a serial modem,
mouse, or printer.
Some serial devices may require additional support software, which is usually included with the device.
For more information about device-specific software, refer to the manufacturer's instructions.
▲ To connect a serial device, connect the device cable to the serial port on the computer.
96 Chapter 7 External devices