Specifications
Si2493
Rev. 1.3 37
Table 11. Extended AT\ Command Set (Command Defaults in Bold)
Command Action
\$ Display AT\ command settings.
\Bn Character length will be automatically set in autobaud mode
\B0 6N1—six data bits, no parity, one stop bit, one start bit, eight bits total (\N0 only)
1
\B1 7N1—seven data bits, no parity, one stop bit, one start bit, nine bits total (\N0 only)
1
\B2 7P1—seven data bits, parity optioned by \P, one stop bit, one start bit, 10 bits total
\B3 8N1—eight data bits, no parity, one stop bit, one start bit, 10 bits total
\B5 8P1—eight data bits, parity optioned by \P, one stop bit, one start bit, 11 bits total (\N0 only)
\B6 8X1—eight data bits, one escape bit, one stop bit, one start bit, 11 bits total (enables ninth-bit
escape mode)
\Nn Asynchronous protocol
\N0 Wire mode (no error correction, no compression)
\N2 MNP reliable mode. The Si2493 attempts to connect with the MNP protocol. If unsuccessful, the call
is dropped.
\N3 V.42 auto-reliable—The Si2493 attempts to connect with the V.42 protocol. If unsuccessful,
the MNP protocol is attempted. If unsuccessful, wire mode is attempted.
\N4 V.42 (LAPM) reliable mode (or drop call)—Same as \N3 except that the Si2493 drops the call
instead of connecting in MNP or wire mode.
\N5 V.42 and MNP reliable mode—The Si2493 attempts to connect with V.42. If unsuccessful, MNP is
attempted. If MNP us unsuccessful, the call is dropped.
\Pn Parity type will be automatically set in autobaud mode
\P0 Even
\P1 Space
1
\P2 Odd
\P3 Mark
1
\Qn Modem-to-DTE flow control
\Q0 Disable all flow control—This may only be used if the DTE speed and the VF speed are guaranteed
to match throughout the call.
\Q2 Use CTS only
Notes:
1. When in autobaud mode, \B0, \B1, and \P1 will not be detected automatically. The combination of \B2 and \P3 will be
detected. This is compatible with seven data bits, no parity, two stop bits. Seven data bits, no parity, one stop bit may be
forced by sending AT\T17\B1.
2. The autobaud feature does not detect this rate.
3. Default is \T9 if a pulldown resistor is connected to the autobaud strap pin; otherwise, the default is \T16.