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A: Technical Specifications
Note: If you are attaching a modem with modem signals and RTS/CTS flow control, you
must use the /dev/ttyf* command devices in the configuration files. For more detailed
information, see the serial man page. To access this man page, from the Toolchest, select
Help > InfoSearch > Man pages. Or place the cursor in the console window and type:
man serial
Serial Port Converters
The O2+ workstation’s serial ports conform to the PC standard pinout for EIA standard
RS-232 signals. The transmit and receive circuits are also capable of higher speed
signalling according to the EIA RS-423 standard. You can also convert these signals to
support other interfaces.
SGI offers two converters: one for the RS-422, commonly used for video deck control, and
an Apple Macintosh to MIDI converter for the RS-422-like signalling used by MIDI
devices to connect to Apple Macintosh serial ports.
Table A-13 Cable Pinout Assignments for PC Modem Cable
Signal
Description
Pin Number
DB-9 Connector (Female)
Pin Number
DB-25 Connector (Male)
DCD 1 8
RXD 2 3
TXD 3 2
DTR 4 20
GND 5 7
DSR 6 6
RTS 7 4
CTS 8 5
RI 9 22
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