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22 AT Command Set Summaries
Command Options Function & Description
M2 Speaker always on
M3 Speaker off during dialing and on until carrier present
Nn Select negotiate handshake
N0 When originating or answering, handshake only at the communication
rate specified by S37 register and “ATBn” and no fallback
N1 * When originating or answering, start handshaking only at the
communication standard specified by S37 register and “ATBn” During
handshake, fallback to a lower speed may occur.
On Go on-line
O0 Return modem to a previously established state (return to data mode).
O1 Begin an equalizer retrain sequence, then
return to on-line state.
O3 Force modem to a new rate defined by user
New rates are defined in S62 register.
P Enable pulse dialing
Qn Result code display options
Q0 * Result code enabled
Q1 Result code disabled
T Enable tone dialing
Vn Result code form
V0 Display result code in numeric form (see
also the result code options table)
V1 * Display result code in verbose (text) form
Wn Select extended result code options
W0 CONNECT result code reports DTE speed. Disable protocol result codes.
(see also the “Result Code Options Table”)
W1 CONNECT result code reports DTE speed. Enable protocol result codes.
W2 * CONNECT result code reports DCE speed. Enable protocol result codes.
Xn Select result codes/call progress options
X0 Display CONNECT or “1” for all speeds.
Ignore dial tone and busy tone detection.
X1 Display connect message and the modem’s data rate, and an indication of
the modem’s error correction and data compression.
Ignore dial tone and busy tone detection.
X2 Display connect message and the modem’s data rate, and an indication of
the modem’s error correction and data compression.
Check dial tone before proceeding dialing,
ignore busy tone detection.
X3 Display connect message and the modem’s data rate, and an indication of
the modem’s error correction and data compression.
Ignore dial tone before proceeding dialing,
check busy tone after making dialing.
X4 * Display connect message and the modem’s data rate, and an indication of
the modem’s error correction and data compression.
Check dial tone and busy tone.
X5 Same as X4.
X6 Same as X4.
X7 Display CONNECT or “1” for all speeds.
Check dial tone and busy tone.
Zn Recall stored profile