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A Monitor Port and Cable15-pin monitor male cable connects to...15-pin female monitor port1

Male and Female ConnectorsMale connectorFemale connector2Serial Transmission Sends One Bit at a TimeSend one byte1011001110110011Receive one byte1 - 0 - 1 - 1 - 0 - 0 - 1 - 1bits3

A Serial Interface25-pin serial port on a serial device (modem)

25-pin end of serial cable connects to modem and 9-pin end connects to computers serial port4Serial DB-25 Connector PinsPinSignalPinSignal1Protected ground14Secondary transmitted data2Transmitted data15Transmit timing signal3Received data16Secondary received data4Request to send17Receive timing signal5Clear to send18Unassigned6Data set ready19Secondary request to send7Signal ground20Data terminal ready8Data carrier detector21Signal quality detector9Reserved for data set testing22Ring indicator10Reserved for data set testing23Data rate selector11Unassigned24External timing signal12Secondary carrier detector25Unassigned13Secondary clear to send

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Serial Port Pinouts for a 9-Pin Connector6

Null-Modem PinoutsMaleFemaleNOTE: Line colors are not intended to represent wire colors.7Default Settings for a Serial Port

8Parallel Transmission Sends a Whole ByteSend one byte10110011Receive one byte101100119

IEEE 1284 ConnectorsCentronics 1284 Type BMini-Centronics 1284 Type CDB-25 1284 Type A10Parallel Port Pinouts

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Connecting a Non-printer Parallel Port DeviceConnects to parallel port on the computerConnects to device12

A PS/2 Interface

PS/2 keyboard portPS/2 mouse port

CablePS/2 mouse (device)PS/2 connector13PS/2 Keyboard and Mouse Ports

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USB ConnectorsType B connector connects to USB deviceType A connector connects to USB port on the computer or on a hub15

USB Ports, Cables, and ConnectorsType B connector connects to USB port on devicesConnects to a USB port on the computer or another hubUSB hubType A connector connects to USB port on the computer or a hub16USB Power5-volt power supply is carried along with the USB signal.Allows small devices, such as handheld scanners or speakers, to use power from the PC, rather than requiring their own power cables.Devices are plugged directly into a 4-pin socket on the PC or hub using a rectangular Type A socket.A USB bus distributes power through each port. This allows low-power devices that normally need their own power adapters to be powered through the cable.Hubs may get all of their power from the USB bus (bus-powered), or they may be powered from their own AC adapters.SymptomPossible ProblemSolutionUSB devices dont work.USB support not enabled in the BIOS.USB BIOS support must be enabled to assign an IRQ to the PCI USB host bus controller. Cant connect USB devices.No USB port on the system.Install a PCI to USB adapter card in the system.Devices dont function or arent detected.USB 1.0 system with cable over 5 meters.Reduce cable length to 5 meters.Device cannot be seen in Device Manager.Operating system does not support USB.USB device failure.Windows 95 provides limited USB support.Upgrade to Windows 98, Windows 2000, or Windows XP.USB device displays an unknown device icon in Device Manager.If the USB host controller but not the Root Hub appears, there could be a possible problem with the USB.INF file.Remote the USB host controller from Device Manager and then click Refresh.Common USB Power Problems18

FireWire Connectors4-pin6-pin19

FireWire ConnectionsFireWire deviceFireWire 6-pin connectorFireWire port20

Transferring Information Over an Infrared ConnectionIR portIR port

21A Digital Radio Wireless Mouse

Receiver connects to USB or PS/2 portTransmitter22