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Command
Options Function & Description
Sr?
T
Vn
V0
V1 *
Xn
n=0-7
5 *
n=0-1
Zn
n=2
$ or ?
&$ or &?
*$ or *?
Extended AT& Command Set
Command
Options Function & Description
&Bn
&B0
&B1 *
&Cn
&C0
&C1 *
&Dn
&D0
&D1
&D2 *
&D3
&F
&Gn
&G0 *
&G1
&G2
&Hn
&H0
&H3 *
&H4
&Kn
&K0
&K1
&K2
&K3
&K4 *
&Mn
&M0 *
&M1
&M2
&Nn
&N0 *
18 AT Command Set Summaries
Display value stored in S-register 'r'
Ton dial
Sets display type for Result Codes
Display result code in numeric form. (See the result code table of 'ATXn')
Display result code in verbose form.
Result code options, see the Options Table
Reset modem and set power-on profile n.
Reset modem and load factory settings.
Basic command summary help
Extended 'AT&' command summary help
Extended 'AT*' command summary help
Data rate, terminal-to-modem. (DTE/DCE)
DTE rate follows connection rate. (See also S44.6)
DTE/DCE rate fixed at DTE setting (See also S18, S20, and S44.6)
Carrier Detect (CD) options
CD always ON
CD tracks presence of carrier
Data Terminal Ready (DTR) options
Ignore DTR signal, assume DTR is always ON.
108.1, DTR OFF-ON transition causes dial of the default number.
108.2, Data Terminal Ready, DTR OFF causes the modem to hang up.
Same as &D2 but DTR OFF causes the modem to hang up and reset from
profile 0.
Load factory settings to RAM as active configuration.
Guard tone options
No guard tone (within USA, Canada).
550 Hz guard tone.
1800 Hz guard tone.
Data flow control, DTE/DCE.
Flow control disabled.
Hardware (CTS/RTS) flow control
Software (XON/XOFF) flow control.
Modem error control and data compression.
No error control.
MNP4
MNP4+MNP5
V.42+MNP4.
V.42+V.42bis, compatible with &K2
Synchronous/asynchronous mode selection
Asynchronous mode with data buffering
Hayes AutoSync mode
Direct asynchronous mode, no data buffering
Modem link mode options (DCE/DCE).
Multi-Auto, auto negotiate highest possible link rate: V.34bis, V.34,
V.32bis, V.32, V.22bis, V.22 and Bell 212A.
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