syac(7)                        DG/UX 5.4R3.00                        syac(7)


NAME
       syac - Systech intelligent VME asynchronous controller

SYNOPSIS
       syac([vmebus,][def]) or
       syac@devicecode([vmebus,]VMEaddr)

DESCRIPTION
       A SYAC is an intelligent asynchronous terminal I/O controller that
       controls a number of terminal lines.  The controllers supported are
       as follows:

            Name         # Lines   Description

            VAC/16       16        Asynchronous 16-port controller;
                                   supports modem control

            VDC/8P       8         8-port cluster control box with
                                   printer port; supports modem control

            VDC/16       16        16-port cluster control box;
                                   supports modem control

            VDA/128      128       Terminal server host adapter

            VDA/255      255       Terminal server host adapter

            VTC/256      256       Network terminal server host adapter

       The VDA/128 controller is an ARCNET controller supporting up to 128
       asynchronous lines using the VDC/8P and/or VDC/16 remote cluster
       controllers.  The VDA/255 controller supports up to 255 lines using
       the VDC/8P and/or VDC/16 remote cluster controllers.

       The VTC/256 controller is an ethernet controller supporting up to 256
       network connections.  The VTC/256 supports a general board Internet
       address and optional tty specific Internet addresses.  The VTC/256
       supports telnet, rlogin, and tcp connections.  The VTC/256 also
       supports call out connections.  By default, ttys associated with a
       VTC answer telnet connections made to the default Internet address
       for that VTC and telnet binary mode is negotiated on when a telnet
       connection is established.  The port, protocol, direction, and telnet
       binary modes of a connection can be specified on a per-tty basis in
       the /etc/tcload/vtc.addrs file (see vtc.addrs(1M)).  The VTC/256
       controller also has an SNMP agent.  The VTC's SNMP communities,
       hosts, traps, and site specific objects can be specified by modifying
       the VTC SNMP files located in /etc/tcload (see vtcsnmpfiles(1M)).
       The VTC's default SNMP community is public with read access only.

       Intelligent controllers are actually processors that perform I/O
       processing according to the tty modes in effect for each line.  It is
       necessary for the system administrator to load the SYAC-resident code
       image into SYAC memory before lines controlled by the SYAC can be
       used (see tcload(1M)).



Licensed material--property of copyright holder(s)                         1

syac(7)                        DG/UX 5.4R3.00                        syac(7)


       Terminals controlled by SYACs present the standard DG/UX terminal
       interfaces described in termio(7).  All model SYACs support all
       specified baud rates.

       The syac entry has two formats (shown above and illustrated below).
       The first format accepts all defaults for a specified controller
       board.  The second format specifies all values:

       vmebus        The device name of the parent VME bus to which the
                      syac controller is attached, such as vme(0) or vme(1).
                      If this parameter is omitted, a parent bus of vme(0)
                      is assumed, and all subsequent parameters move up one
                      position.  Thus, syac(3) is equivalent to
                      syac(vme(0),3).

       def            A number from 0 to F, or null for 0, identifying the
                      controller board defaults to use

       @devicecode   The controller device code, preceded by the @
                      character

       VMEaddr       The VME address of the controller

FILES
       /dev/tty[0-9]*                     Terminal device files
       /dev/async/syac*                   SYAC control nodes
       /usr/lib/tcload/models/syac/*      SYAC related files
       /etc/tcload/vtc.addrs              SYAC VTC Configuration file
       /etc/tcload/vtc.snmp.config        SYAC VTC SNMP Configuration file
       /etc/tcload/vtc.snmp.communities   SYAC VTC SNMP Communities file
       /etc/tcload/vtc.snmp.hosts         SYAC VTC SNMP Hosts file
       /etc/tcload/vtc.snmp.traps         SYAC VTC SNMP Traps file

SEE ALSO
       tcload(1M), vtc.addrs(4M), vtcsnmpfiles(4M), termio(7), vme(7).






















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