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38 536EX Chipset Developer’s Manual
Intel Confidential
Data Mode AT COMMANDS
Local Modem (or Test Modem)
AT&F &W<CR> Returns the modem to the factory defaults.
AT S18=20 &T8 Causes the modem to start local analog loopback with self-test for 20
seconds.
OK After starting analog loopback, the modem goes back to command
mode.
AT The modem responds to new commands.
OK
000
After 20 seconds, the modem stops analog loopback, sends
OK an error count to the DTE, and enters command mode.
AT S18=0 &T8 Causes the modem to start local analog loopback with self-test, which
is only terminated by AT&T0 or ATH.
OK After starting analog loopback, the modem goes back to command
mode.
AT The modem responds to new commands.
OK
AT&T0 After receiving AT&T0 or ATH, the modem stops analog
000 loopback, sends an error count to the DTE, and enters
OK command mode.
3.10 AT Escape Sequences
The 56K family provides the industry-standard Time Independent Escape Sequence (TIES). The
DTE sends the escape sequence to return the modem to command state while in the online data
state (that is, connected to another modem) or in diagnostic mode (&Tn commands).
Intel also makes the Hayes
Escape Sequence available to customers; however, see the following
statement regarding licensing requirements.
3.10.1 Time-Independent Escape Sequence
The TIES (Time-Independent Escape Sequence), implemented with +++AT, was developed by a
group of modem manufacturers as an alternative to the Hayes Escape Sequence. TIES was
designed for compatibility with existing communication software written for the Hayes Escape
Sequence.
Licensing Requirements for Hayes Escape Sequence
The Intel chipsets are manufactured with TIES as the default setting. It is Hayes’ position that you
must either have or obtain a valid license from Hayes Microcomputer Products, Inc., of Norcross,
Georgia, before producing modem systems that use the Hayes Escape Sequence.
Intel accepts no responsibility and does not indemnify nor in any way provide protection for
patent or possible patent violations to its customers or users of its products.