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System Unit Rear Panel Connectors
20
Serial Input/Output Connectors
There are a variety of pointing devices (mouse or
trackball) or peripheral devices that can attach to the
Serial Input/Output (SIO) ports on the workstation.
Peripheral devices include printers, plotters, modems,
and scanners. Consult the documentation that accom-
panies each peripheral device for specific information
concerning its use.
The SIO ports are programmable, allowing functions
such as bit rate, character length, parity, and stop bits
to be set. The SIO Ports are used as interfaces for
serial asynchronous devices to the CPU. The ports
operate at up to a 460.8 K baud rate.
Table 5 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 5 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