Time Independent Escape Sequence (Ties) - Epson ESC/VP21 User Manual

W Wait for Dialtone
Causes
time. If dial tone or the amount of time specified by the S-register
S6 times-out, the modem will then process the next command in the
dial string. If a busy signal is detected, the modem will respond
back to the DTE with a busy response code, and then go into off-
line command mode.

2.4 Time Independent Escape Sequence (TIES)

The Time Independent Escape Sequence (TIES) has been developed by a
group of modem manufacturers as an alternative to the Hayes Escape Se-
quence. TIES has been designed to work with existing communication soft-
ware written for the Hayes Escape Sequence.
The escape sequence is sent by the host (DTE) to return the modem to
command state while in the on-line data state (connected to another mo-
dem) or diagnostic mode (&Tn commands).
The DTE implements the escape sequence by sending the escape charac-
ter three times, followed by a valid 'AT' command and the contents of S3
(typically a <CR>). Upon detecting the three consecutive escape charac-
ters, the modem changes to a TIES command mode, and starts an internal
Escape Prompt Delay timer (EPD) - with the time limit as defined by S12.
If the EPD timer times out, the modem sends an 'OK' message to the DTE
2 - COMMAND REFERENCE
the modem to look for dial tone for a specified amount of
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