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Appendix C - AT Command Summary
Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide
&Fn n = 0, 8 or 9 &F loads factory default values from ROM.
* &F8 reads factory default values and switch settings
when &F is issued.
&F9 reads parameters stored in non-volatile
memory when &F is issued.
$Fn n = 0 or 1 $F0 means do not fall back to normal connect if CR
received.
* $F1 means fall back to normal connect if CR
received.
$FCn (MT2834BL) n = 0 or 1 $FC0 means no transmit of 5 second 2100Hz signal.
* $FC1 transmits 5 second 2100Hz signal.
&Gn n = 0, 1 or 2 * &G0 turns off CCITT guard tones.
&G1 turns on CCITT 550 Hz guard tone.
&G2 turns on CCITT 1800 Hz guard tone.
Hn n = 0 or 1 H0 means Hang Up (go on hook).
H1 means Go Off Hook.
$Hn n = 1 thru 3 $H1 brings up Help Screen #1.
$H2 brings up Help Screen #2.
$H3 brings up Help Screen #3.
In n = 0,1or 2 I0 requests modem ID #.
I1 requests firmware revision #.
I2 for MTS internal use.
I9 Read Only Command enables display of Windows 95
Autodetect characteristics
L Lists all stored telephone numbers in memory.
L5 L5 lists all current operating parameters.
L6 L6 lists all current S-Register values.
L7 L7 lists additional parameters.
L8 L8 lists On-Line Diagnostics.
L9 L9 Displays Signal Strength Information.
L10 L10 Displays Signal to Noise Ratio Information.
L11 L11 Displays Noise Information.
#Ln n = 0 thru 3 * #L0 means modems negotiate V.42 Mode.
#L1 means MNP on and LAP-M off.
#L2 means LAP-M on and MNP off.
#L3 means no detection phase but go directly to
LAP-M.
$LLn n=0 or 1 * $LL0 is Multi-Tech’s lease-line handshake
$LL1 is the V.34 leased-line handshake
Mn n = 0 thru 3 M0 means Monitor speaker always Off.
* M1 means Monitor speaker On until carrier detected
M2 means Monitor speaker always On.
M3 Monitor speaker on during dialing/off during
handshaking.
*Factory Default