---

   chat    ( 8 )

---

ABORT STRINGS

Many modems will report the status of the call as a string. These
       strings may be CONNECTED or NO CARRIER or BUSY. It is often
       desirable to terminate the script should the modem fail to
       connect to the remote. The difficulty is that a script would not
       know exactly which modem string it may receive. On one attempt,
       it may receive BUSY while the next time it may receive NO
       CARRIER.

       These "abort" strings may be specified in the script using the
       ABORT sequence. It is written in the script as in the following
       example:

              ABORT BUSY ABORT 'NO CARRIER' '' ATZ OK ATDT5551212
              CONNECT

       This sequence will expect nothing; and then send the string ATZ.
       The expected response to this is the string OK. When it receives
       OK, the string ATDT5551212 to dial the telephone. The expected
       string is CONNECT. If the string CONNECT is received the
       remainder of the script is executed. However, should the modem
       find a busy telephone, it will send the string BUSY. This will
       cause the string to match the abort character sequence. The
       script will then fail because it found a match to the abort
       string. If it received the string NO CARRIER, it will abort for
       the same reason. Either string may be received. Either string
       will terminate the chat script.