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.
When you turn on the server, the POST routine assigns
the serial ports to specific communication port addresses.
Table 3. Serial port pin-number assignments
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
Netfinity 5500 M20 - Type 8662
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