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Command Options Function & Description
&Hn
&Jn
&Kn
&Ln
&Mn
76 AT Command Set Summaries
&G0 * No guard tone (within USA,
Canada).
&G2
1800 Hz guard tone.
Data flow control, DTE/DCE.
&H0
Flow control disabled.
&H3 * Hardware (CTS/RTS) flow control
&H4
Software (XON/XOFF) flow
control.
Type of Phone line
&J0
Single phone line, RJ-11
&J1
Multiple phone/modem line,
RJ12/RJ13
Modem error control and data
compression.
&K0
No error control.(Same as AT&K)
&K1
MNP4 (See also S41.0).
&K2
MNP4+MNP5 (See also S38.5,
S41.0).
&K3
V.42+MNP4.
&K4 * V.42+V.42bis, compatible with
&K2 (See also S38.5).
&L0 * Dial-up line
&L1
2W leased line
&L2
4W leased line
Synchronous/asynchronous mode
selection
&M0 * Asynchronous mode with data
buffering
&M1
Asynchronous command,
synchronous data
&M2
Direct asynchronous mode, no data
buffering
Ref.
S27.3-5
S28.0
S27.0-2
S14.2-3
S14.6-7
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Troubleshooting
