ace man page on Tru64

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ace(7)									ace(7)

NAME
       ace - Serial communications interface

SYNOPSIS
       controller     ace0 at *	     slot ?    vector aceintr

DESCRIPTION
       The  ace serial line controller provides a serial communications inter‐
       face 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.)  Cur‐
       rently, some processors that use the ace driver limit the  serial  con‐
       sole 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 docu‐
       mentation to determine the type of console  support  your  system  pro‐
       vides.

       The  driver  for the ace interface supports hardware flow control using
       the Request to Send (RTS) and Clear to Send (CTS) signals.  When	 hard‐
       ware  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 data.

       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	 time‐
       out),  1,  or 2 seconds.	 Alternatively, you can use the sysconfig com‐
       mand 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
       If you are using the alternate system console to perform kernel	debug‐
       ging,  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
       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 supported.

FILES
       console terminal local terminal local terminal

SEE ALSO
       MAKEDEV(8), console(7), devio(7), modem(7), ports(7), tty(7)

       Kernel Debugging

       System Administration

									ace(7)
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