IBM 86626RY Hardware Maintenance Manual - Page 197

Two serial-port connectors One system management connector One parallel-port connector One video-port connector One keyboard-port connector One auxiliary-device-port connector One SCSI-port connector One Ethernet-port connector Two USB-port connectors One RS-485-port connector See the illustration in "Input/output connectors and expansion slots" on page 209 for the locations of the connectors. Serial ports: The server comes with two serial ports. (See "Input/output connectors and expansion slots" on page 209 for the locations of the connectors.) These ports are used to communicate with printers, plotters, external modems, scanners, and auxiliary terminals. These ports also enable you to transfer data between computers. Serial ports can transfer data asynchronously, which means that they can transmit any number of characters at any time, with no restriction on the duration of the pauses between characters. The serial ports can transmit and receive data and commands at rates of from 300 bits per second up to 115 000 bits per second. Serial port A is shared by the operating system and the integrated Netfinity Advanced System Management Processor. Serial port B can be used only by the operating system. Each serial port has a 9-pin, male D-shell connector on the back of the server. The pin-number assignments of this connector conform to the industry standard. 1 5 6 9 The following table shows the pin-number assignments for the serial-port connectors. Table 3. Serial port pin-number assignments Pin Signal 1 Data carrier detect 2 Receive data 3 Transmit data 4 Data terminal ready 5 Signal ground Pin Signal 6 Data set ready 7 Request to send 8 Clear to send 9 Ring indicator When you turn on the server, the POST routine assigns the serial ports to specific communication port addresses. Netfinity 5500 M20 - Type 8662 189