IBM 847671U Hardware Maintenance Manual - Page 97

device with the Netfinity 3000 server, you must connect it to the external SCSI connector, using a SCSI cable. This SCSI cable must have the proper connector for the SCSI external connector on one end, and the proper connector for the external device on the other end. To select and order the correct SCSI cable for use with the external device, contact your IBM reseller or IBM marketing representative. Serial port connectors: Serial ports are used to communicate with printers, plotters, external modems, auxiliary terminals, and other computers. The server provides two serial ports (1 and 2). You can add more serial ports by installing a serial adapter in one of the expansion slots. Serial ports transfer data asynchronously; they can transmit any number of bits at any time, with no restriction on the duration of the pauses between characters. The serial ports transmit and receive data and commands at a rate of 300 bits per second (bps) up to 115 200 bps. The bits-per-second measurement is commonly referred to as the baud rate. Both of the serial connectors on the server use a 9-pin, D-shell connector. 1 5 6 9 Table 2 shows the pin-number assignments for the serial port connectors. The pin-number assignments conform to the industry standard. Pin Signal Pin Signal 1 Data carrier detect 6 Data set ready 2 Receive data 7 Request to send 3 Transmit data 8 Clear to send 4 Data terminal ready 9 Ring indicator 5 Signal ground Table 2. Serial Port Connector Pin-Number Assignments IBM Netfinity 3000 - Type 8476 89