*

Standard Hayes Compatible AT Command Set

Section 3

Back to section 1

Back to section 2

Bolded text indicates default setting (&F)

%C0 %C1 %C1 %C3	Disables data compression Enables MNP5 compression Enables V.42bis compression Enables both MNP5 and V.42bis compression
%E0 %E1 %E2 %E3	Disables line-quality monitoring and auto-retraining Enables monitoring and retraining Enables monitoring and fallback/fall forward Enables monitoring, retraining and fast hang up
%L	Reports received signal level in -DBm
%Q	Reports line signal quality
\A0 \A1 \A2 \A3	64 character maximum MNP block size 128 character maximum MNP block size 192 character maximum MNP block size 256 character maximum MNP block size
\Bn	In non-error correction mode, transmits line break to remote modem in 100ms units (1-9 with 3 as default)
\G0 \G1	Disables XON/XOFF (modem to modem) flow control Enables XON/XOFF (modem to modem) flow control
\Kn	Defines break type
\N0 \N1 \N2 \N3 \N4 \N5	Normal data link with speed buffering; no error correction Selects serial interface; same as &Q0 Selects reliable (error correction) mode (first LAPM, then MNP) Selects auto-reliable mode (LAPM, MNP, Normal) LAPM error correction only MNP error correction only
\V=0 \V=1 .	Disables Single Line Connect Message Enables Single Line Connect Message, where the format is: CONNECT <DTE speed></Modulation></Protocol></Compression></Line speed>
-SDR=0 -SDR=1 -SDR=2 -SDR=3 -SDR=4 -SDR=5 -SDR=6 -SDR=7	Disables Distinctive rings Ring Cadence Enables Type 1, 2 secs ON, 4 secs OFF Enables Type 2, 0.8 sec ON, 0.4 sec OFF, 0.8 sec ON, 4.0 sec OFF Enables Type 1 & 2, 0.4 sec ON, 0.2 sec OFF, 0.4 sec ON, 0.2 sec ON Enables Type 3. 0.8 sec ON 4.0 sec OFF Enables Type 1 & 3 Enables Type 2 & 3 Enables Type 1, 2 & 3
$$RO $$R1 . . . .	Disables Distinctive Ring Enables Distinctive Ring, Cadences are: A = 2.0 secs ON, 4.0 secs OFF B = 0.8 sec ON, 0.4 sec OFF, 0.8 sec ON, 4.0 secs ON C = 0.4 sec ON, 0.2 sec OFF, 0.4 sec ON, 0.2 sec OFF, 0.8 sec ON, 4.0 secs OFF D = 0.3 sec ON, 0.2 sec OFF, 1.0 sec ON, 0.2 sec OFF, 0.3 sec ON, 4.0 secs OFF
-K0 -K1 -K2	Disables V.42 LAPM to MNP10 conversion Enables V.42 LAPM to MNP10 conversion Enables V.42 LAPM to MNP10 conversion: inhibits MNP Extended Services initiation during V.42 LAPM anser mode detection
-Q0 -Q1	Disables MNP10 fallback to 2400 bps. Enables MNP10 fallback to 2400 bps
-SEC=0 -SEC=1	Disables MNP10-EC operation Enables MNP10-EC operation
:E0 :E1	Disables V.32 compromise equalizer Enables V.32 compromise equalizer

+MS=<mod>,<automode>,<min_rate>,<max_rate>

Selects modulation: optionally enables or disables automatic modulation negotiation with the remote modem or faxmodem; optionally sets minimum and/or maximum rates

<mod> 0 1 2 3 9 10 11 . 56 . . 64 69	Selects Modulation V.21 V.22 V.22bis V.23 V.32 V.32bis V.34 . K56Flex . . Bell 103 Bell 212	Possible speeds 300 1200 2400, 1200 1200 9600, 4800 14400, 12000, 9600, 7200, 4800 33600,31200,28800,26400,24000,19200, 16800,14400,12000,9600,7200,4800,2400 56000,54000,52000,50000,48000,46000, 44000,42000,40000,38000,36000,34000, 32000, (downstream speed only) 300 1200
<automode> 1 0	Enables or disables automatic modulation negotiation with the remote modem Enables (equivalent to N1 command) Disables (equivalent to N0 command)	. . .
<min_rate>	300	(See possible rates above)
<max_rate>	33600	(See possible rates above)
Example	+MS=11,1,300,28800	Sets mode 11, enables auto modulation and sets the min/max baud rate to 300 and 28800.