RSA(4)                  COMMAND REFERENCE                  RSA(4)



NAME
     rsa - on-board asynchronous interface

DESCRIPTION
     The discussion of terminal I/O given in tty(4) applies to
     these devices.

     Speed selections from B0 to B9600 as listed in tty(4) are
     available through the ioctl(2) system call.  Speed selection
     B0 disables baud rate generation and drops data terminal
     ready (useful for forcing a dataset hang-up).  Impossible
     speed changes are ignored.

     In addition to the normal DC1/DC3 (CTRL-Q/CTRL-S) flow
     control, the RS-232-C lines DTR and CTS can be used.   When
     DTR is unasserted (pin 20: -12v) by the terminal, then the
     driver will not transmit.  conversely, when the driver's
     input buffer is near full, it will unassert CTS (pin 5)
     inhibiting the terminal from further transmission until the
     buffer is near empty and CTS is re-asserted.  The use of
     these hardware lines can be individually enabled/disabled by
     the use of tty flags set/reset using the ioctl(2) system
     call and the commands TIOC{GET,PUT,BIC,BIS}.  The
     appropriate flags are DODTR and DOCTS.  These can be {re}set
     via stty(1) using the {-}dtr and {-}cts flags.

FILES
     /dev/console
     /dev/ttyo[0-1]

SEE ALSO
     tty(4).























Printed 10/17/86                                                1

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na:72,73;
de:145,1446;
fi:1591,113;
se:1704,92;
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