автоматизированный разговорный скрипт с модемом (Automated conversational script with a modem)
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.
