3-15
3.2.4. AT\ Commands
\Gn - Modem-to-Modem Flow Control (XON/XOFF)
In non-error correction mode, the modem enables or disables the generation or recognition of modem-to-modem XON/XOFF flow control
according to the parameter supplied. The parameter value, if valid, is written to S41 bit 3.In error correction mode, the setting of modem-to-
modem XON/XOFF flow control is ignored. However, the serial port flow control settings (AT&K) remain active during a reliable link.Due to the
buffering system used in the modem, modem-to-modem flow control is normally disabled.
\G0
Disables modem-to-modem XON/XOFF flow control. (Default.)
\G1
Enables modem-to-modem XON/XOFF flow control.
Result Codes:
OK
n = 0 or 1.
ERROR
Otherwise.
\Kn - Break Control
Controls the response of the modem to a break received from the DTE or the remote modem or the \B command according to the parameter
supplied. The parameter value, if valid, is written to S40 bits 3, 4, and 5. The response is different in three separate states.
The first state is where the modem receives a break from the DTE when the modem is operating in data transfer mode:
\K0
Enter on-line command mode, no break sent to the remote modem.
\K1
Clear data buffers and send break to remote modem.
\K2,\K4
Same as \K0
\K3
Send break to remote modem immediately.
\K5
Send break to remote modem in sequence with transmitted data. (Default.)
The second case is where the modem is in the on-line command state (waiting for AT commands) during a data connection, and the \B is
received in order to send a break to the remote modem:
\K0,\K1
Clear data buffers and send break to remote modem.
\K2,\K3
Send break to remote modem immediately.
\K4,\K5
Send break to remote modem in sequence with data. (Default to \K5.)
The third case is where a break is received from a remote modem during a non-error corrected connection:
\K0,\K1
Clears data buffers and sends break to the DTE.
\K2,\K3
Send a break immediately to DTE.
\K4,\K5
Send a break in sequence with received data to DTE. (Default to \K5.)
Result Codes:
OK
n = 0 to 5.
ERROR
Otherwise.
\Nn - Operating Mode
This command controls the preferred error correcting mode to be negotiated in a subsequent data connection.
\N0
Selects normal speed buffered mode (disables error-correction mode). (Forces &Q6.)
\N1
Selects direct mode and is equivalent to &M0, &Q0 mode of operation. (Forces &Q0.)
\N2
Selects reliable mode. The modem will first attempt a LAPM connection and then an MNP connection. Failure
to make a reliable connection results in the modem hanging up. (Forces &Q5, S36=4, and S48=7.)
\N3
Selects auto reliable mode. This operates the same as \N2 except failure to make a reliable connection results
in the modem falling back to the speed buffered normal mode. (Forces &Q5, S36=7, and S48=7.)
\N4
Selects LAPM error-correction mode. Failure to make an LAPM error-correction connection results in the
modem hanging up. (Forces &Q5 and S48=0.) Note: The -K1 command can override the \N4 command.
\N5
Selects MNP error-correction mode. Failure to make an MNP error-correction connection results in the modem
hanging up. (Forces &Q5, S36=4, and S48=128.)
Result Codes:
OK
n = 0 to 5.
ERROR
Otherwise.
