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AT Command Set and S-Registers
Table 4-1. AT Command Reference (11 of 18)
AT
Command Description
\N n
Set Operating Mode
This command determines the type of connection attempted
by the modem. For more information on this command, refer to
Appendix D, Advanced Modem Concepts .
\N0
\N1
\N 2
\N 3
\N4
NOTE: 300 bps does not support synchronous operation. The
mode will automatically fall back to MNP asynchronous
operation.
Reserved.
\O
\Q n
Set Serial Port Flow Control
This command specifies the DTE-to-modem flow control.
Software flow control uses the XOFF (13 hex) and
XON (11 hex) characters to stop and start data transmission,
respectively, both to and from the DTE.
Unidirectional hardware flow control uses the CTS control line
to stop/start data from the DTE only, while bidirectional
hardware flow control also uses the RTS control to stop/start
data from the modem.
For more information on flow control, also refer to the \G and
\X commands.
\Q0
\Q1
\Q2
\Q3
4-12
Issue 1 November 1994
Normal Mode — No data compression or error
correction, but uses speed buffering.
Direct Mode — No data compression, error correction,
or speed buffering.
MNP Reliable Mode — The modem attempts to
negotiate an MNP error-correction 'reliable' link,
hanging up if it fails.
V.42 Auto-reliable Mode — If V.42 detection is
enabled (by using the – J1) command, a LAPM or
MNP link can be detected and negotiated,
otherwise only LAPM will be attempted.
V.42 Reliable — The modem attempts to negotiate
LAPM error correction, hanging up if it fails.
Disables flow control.
Enables XON/XOFF flow control.
Enables unidirectional hardware flow control.
Enables bidirectional hardware flow control.
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