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Chapter 1 33
System Overview
System Unit Rear Panel Connectors
RS-232C Serial Input/Output Connector
You can attach a variety of pointing devices (such as a mouse or
trackball), or peripheral devices (such as printers, plotters, modems, and
scanners) to the RS-232C Serial Input/Output (SIO) ports on this
computer. Consult the documentation that accompanies each pointing or
peripheral device for specific information concerning its use.
The SIO ports are programmable. This means that you can set functions
such as bit rate, character length, parity and stop bits using the System
Administration Manager (SAM) or by selecting a system special device
file with the functions already programmed. The SIO ports are used as
an interface for serial asynchronous devices to the CPU.
Table 1-3 shows the SIO connector pin listings. The serial connectors are
9-pin D-sub connectors. Signal names are those specified in the EIA
RS-232 standard.
Table 1-3 Serial I/O Pins
Pin No. Signal Description
1 DCD Data Carrier Detect
2 RXD Receive Data
3 TXD Transmit Data
4 DTR Data Terminal Ready
5 GND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator