aux(7)                              CLIX                              aux(7)



  NAME

    aux - Auxiliary serial port interface drivers

  DESCRIPTION

    A system may support three or four serial ports that behave as described
    by termio.  The number available depends on the platform and system
    configuration.

    The format of the minor device mask for aux is shown below:

    Minor Device Format:

                 _______________________________________________
                |  7 |   6 |   5 |   4 |   3 |   2 |   1 |   0 |
                |______________________|___________|___________|
                |                      |           |           |
                |       RESERVED       |     IOP   |    PORT   |
                |______________________|___________|___________|

    The ioctl(fildes, request, arg) function can be used for the following
    requests.  The structures described below are defined in <sys/aux.h>.

    AUX_IOCTL_MODEM
           Reads current modem status.  Modem status is returned in the
           integer pointed to by arg.  Possible bit fields values include:

           MODEM_DCD   Data carrier detect.

           MODEM_DSR   Data set ready.

           MODEM_RI    Ring indicator.

    AUX_IOCTL_SET_RTS
           Enables/Disables RTS/CTS hardware flow control.  If arg points to a
           nonzero integer value, RTS/CTS hardware handshake is enabled.

    AUX_IOCTL_GET_RTS
           Reads RTS/CTS hardware flow control state.  A nonzero value will be
           returned in the integer pointed to by arg if RTS/CTS is enabled.

  FILES

    /dev/tty??   Terminal interface.

  NOTES

    All ports support transmit data (TXD) and receive data (RXD).  In
    addition, port 0 supports request-to-send (RTS), clear-to-send (CTS), data
    carrier detect (DCD), data terminal ready (DTR), data set ready (DSR), and



  2/94 - Intergraph Corporation                                              1

  aux(7)                              CLIX                              aux(7)



    ring indicator (RI).  Ports 1 and 2 on 200-, 2000-, and 6000-series
    systems support only RTS, CTS, and DCD.  Port 3 (if available) only
    supports TXD and RXD.

  RELATED INFORMATION

    Functions:  ioctl(2)

    Files:  termio(7)













































  2                                              Intergraph Corporation - 2/94