ITEM: H2142L

How can Hayes commands be sent to a modem on AIX 3.2.any_level?

Question:

What are the steps to configure AIX at any 3.2 level so that modem command
strings can be sent to any brand of modem using the CU utility and the
uucpadm command?
 *************************************************************************

Response:

The tty which has a modem attached should be configured as a "dumb" device.
It will normally be acceptable to use the default port values such as 8-bits
per character, 1 stop bit, no parity and 9600 BPS.

There should not be a getty respawned on the TTY as viewed in the /etc/inittab
file.  To prevent the CU command from returning the "No Devices Available"
error message, the /etc/uucp/Devices file must be edited via these steps as
the root user:

    cd /usr/lib/uucp

    uucpadm

    Choose option 1) Add/Change UUCP devices

    As an example, the "Uucp Device Maintenance" panel for tty0 should appear
    as:
                          Type:   Direct
                          Line1:  tty0
                          Line2:
                          Class:  9600
                          Dialer: direct
            Next, the ACU entry in the Devices file should be verified with the
    same procedures as just described using the uucpadm command and
    the "Add/Change UUCP devices" selection.  In this case, the "UUCP
    Device Maintenance" panel should appear as follows:

                          Type:     ACU
                          Line1:    tty0   
                          Line2:
                          Class:    9600
                          Dialer:   hayes

    After verifying the Devices entries, the connection should tested by
    issuing the "cu -ml tty\#" command.  If a lock file exists as may be
    signified by a message which indicates that the device was locked, then
    that lock file should be removed via:

                   cd /etc/locks
                   rm *tty\#*

    The "cu -ml tty\#" command should be re-executed to gain a connection.

    As an example only, a Hayes command string to the modem could appear        
    as "ATE0Q2&D2&C1S0=1&W".  To end the connection to the modem, type
    "~.".  When ended, the "connection has ended" message should be 
    displayed.  The modem string depends on the type of modem being used.
    In the case of a non-IBM modem, modem configuration assistance is
    available as a CONSULTLINE offering.



Support Line: How can Hayes commands be sent to a modem on AIX 3.2.any_level? ITEM: H2142L

Dated: May 1994 Category: N/A

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