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NAME    [Toc]    [Back]

       ace - Serial communications interface

SYNOPSIS    [Toc]    [Back]

       controller     ace0 at *      slot ?    vector aceintr

DESCRIPTION    [Toc]    [Back]

       The  ace serial line controller provides a serial communications
  interface  on   DEC   2000,   AlphaStation,   and
       AlphaServer  platforms.  The  serial  communications ports
       that are controlled by ace adhere to the  RS-232  standard
       and  can  operate  at  rates  from  50 to 115200 baud (see
       tty(7)). These communications  ports  support  serial-line
       printers, modems, and terminals.

       In  alternate console configurations (that is, no graphics
       head), the terminal to be the system console must be  connected
  to  the  port  that  is mapped to /dev/tty00. (See
       ports(7) for information about  mapping  AlphaStation  and
       AlphaServer  port labels to device pathnames.)  Currently,
       some processors that use the ace driver limit  the  serial
       console  port  to 9600 baud, 8-bit, no parity and no modem
       support. However, some processor consoles do support  baud
       rates  other than 9600 baud and allow the use of modems as
       console devices. Consult your  hardware  documentation  to
       determine  the  type  of  console support your system provides.

       The driver for the ace interface  supports  hardware  flow
       control  using the Request to Send (RTS) and Clear to Send
       (CTS) signals.  When hardware flow control is enabled, the
       flow of input data is controlled by the RTS signal and the
       flow of output data is controlled by the CTS  signal.   If
       the  CTS signal is off, the driver suspends output to that
       line until the  CTS  lead  is  reasserted.   Likewise  the
       driver turns off the RTS lead to tell the device connected
       to the line to stop sending data as a result of congestion
       on  the  host side.  When the condition clears, the driver
       turns on the RTS lead to tell the device to resume sending

       The  DCD  (carrier  detect) timer value defaults to 2 seconds.
  This value may be changed if  your  modem  hardware
       requires a different value.  the change can be made in the
       /etc/sysconfigtab file as follows:

       ace: dcd_timer=n

       where n is the time interval in seconds, and can be set to
       0  (no  timeout), 1, or 2 seconds.  Alternatively, you can
       use the sysconfig command to set the  same  time  interval
       option as follows:

       # sysconfig -r ace dcd_timer=[n]

       If  you  use  the sysconfig command, the value will not be
       preserved when the system is rebooted.   To  preserve  the
       setting, put the entry in the /etc/sysconfigtab file

NOTES    [Toc]    [Back]

       If  you  are using the alternate system console to perform
       kernel debugging, you must change the kdebug entry in  the
       /etc/remote  file  to  use  /dev/tty01; when the kernel is
       running in debugging mode, no other  application  can  use
       the  port. See Kernel Debugging for information on setting
       up your system for kernel debugging.

RESTRICTIONS    [Toc]    [Back]

       Unless alternative specifications are stated in your  system
  hardware documentation, data communications equipment
       attached to the console serial port in  alternate  console
       configurations  must  be set to 9600 baud, 8-bits, no parity.
  If a serial console is being used, /dev/tty00 cannot
       be  opened  by  another  process.  The ace driver enforces
       this restriction.

       Baud rates greater than 38400 are not supported on the two
       primary  serial ports on the DEC 2000 system.  However, if
       you use an ISA serial or modem card  that  is  capable  of
       communicating  at  the  higher rates, the higher rates are

FILES    [Toc]    [Back]

       console terminal local terminal local terminal

SEE ALSO    [Toc]    [Back]

       MAKEDEV(8),  console(7),  devio(7),  modem(7),   ports(7),

       Kernel Debugging

       System Administration

[ Back ]
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