4
AT Commands
(continued)
\Cn
Error Control Negotiate Buffer
\C0
Data is not buffered during
handshaking sequence.
\C1
Data is buffered up to 4 seconds during
handshaking sequence.
\C2
Data is not buffered during handshaking
sequence; however, the modem switches
to Buffer mode when it receives an error
control fallback character.
\Dn
CTS Control
\D0
Forced On. CTS is forced ON.
\D1
Standard RS232 operation.
\D2
Wink When Disc. CTS turns Off for
approximately 1 to 2 seconds upon
disconnecting.
\D3
Follows DTR. The state of CTS follows
the state of DTR.
\Gn
Modem-to-Modem Flow Control
\G0
Disables modem-to-modem flow
control.
\G1
Enables modem-to-modem flow control.
\Kn
Break Buffer Control, Send Break
Control, Break Forces Escape
\K0
Discards data, sends break before data,
and enables break forces escape.
\K1
Discards data, sends break before data,
and disables break forces escape.
\K2
Keeps data, sends break before data,
and enables break forces escape.
\K3
Keeps data, sends break before data,
and disables break forces escape.
\K4
Keeps data, sends data before break,
and enables break forces escape.
\K5
Keeps data, sends data before break,
and disables break forces escape.
\K6
Discards break, disables break forces
escape.
\Nn
Error Control Mode
\N0
Buffer Mode. Modem does not use error
control; DTE rate can differ from VF rate.
\N1
Direct Mode. Modem does not use error
control; DTE rate and VF rate must be
the same.
\N2
MNP or Disc. Modem disconnects if it
does not connect in MNP mode.
\N3
MNP or Buffer. Modem connects in
Buffer mode if it does not connect in MNP
mode.
\N4
V.42/MNP or Disc. Modem disconnects if
it does not connect in V.42 or MNP mode.
\N5
V.42/MNP or Buffer. Modem connects
in Buffer mode if it does not connect
in V.42 or MNP mode.
\N6
LAPM or disconnect.
\N7
LAPM or buffer.
AT Commands
(continued)
\Qn
Flow Control of DTE
\Q0, \Q5, \Q6
Disables flow control of DTE.
\Q1, \Q4
Enables XON/XOFF flow control.
\Q2, \Q3
Modem raises and lowers CTS to start
and stop flow control.
\Qn
Flow Control of Modem
\Q0, \Q2, \Q4
Disables flow control of modem.
\Q1, \Q5
Enables XON/XOFF flow control.
\Q3, \Q6
Modem starts and stops flow control
based upon state of DTE’s RTS signal.
\Tn
No Data Disconnect Timer
\T0
Disables no data disconnect timer.
\Tn
Sets no data disconnect timer to a value
from 1 minute to 255 minutes.
\Xn
XON/XOFF Passthrough
\X0
Disables transmission of flow control
characters to remote modem.
\X1
Enables transmission of flow control
characters to remote modem.
%A
n
Sets error control fallback character
n to
an ASCII value from 0 to 127.
%B
n
Sets data rate to
n (300 to 19200).
%Cn
MNP 5 Data Compression
%C0
Disables MNP5 data compression.
%C1
Enables MNP5 data compression.
%R
n
Sets DTE rate to
n (300 to 115200).
Hn
V.42 bis Data Compression
H0
Disables V.42bis data compression.
H1
Enables V.42bis data compression for
transmit only.
H2
Enables V.42bis data compression for
receive only.
H3
Enables V.42bis data compression
in both the transmit and receive
directions.
