MULTITECH SYSTEMS, INC.
MT2834LT/MT2834LTI
Modem Type | Data (synchronous/asynchronous)/Fax |
Maximum Data Rate | 28.8Kbps |
Maximum Fax Rate | 14.4Kbps |
Data Bus | PCMCIA Type II |
Fax Class | Class I & II |
Data Modulation Protocol | Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 AT&T V.32terbo |
Fax Modulation Protocol | ITU-T V.17, V.21CH2, V.27ter, V.29 |
Error Correction/Compression | MNP2-5, V.42, V.42bis |
Proprietary AT Command Set
AUTO-RELIABLE TIME BUFFER CONFIGURATION | |
Type: | Configuration |
Format: | AT [cmds] $An [cmds] |
Example: | AT $A1 &W <CR> |
Description: | Controls the handling of incoming data during auto-reliable time period. |
Command | Function |
í $A0 | Data is discarded. |
$A1 | Data is buffered. |
BIT MODE | |
Type: | Configuration |
Format: | AT [cmds] $EBn [cmds] |
Example: | AT $EB1 E1 <CR> |
Description: | Selects 10- or 11-bit mode. |
Command | Function |
í $EB0 | Sets 10-bit mode. |
$EB1 | Sets 11-bit mode. |
CALLBACK NUMBER | |
Type: | Configuration |
Format: | AT [cmds] [+/-]DT <#>Nnn |
Examples: | AT#DB2 +-DT555-1212N10 <CR> |
Description: | Sets the phone number associated with the password at memory location nn. |
Command | Function |
+DT | Modem will initiate callback on successful login. |
-DT | Modem will allow immediate entry on successful login without callback. |
+-DT | If password is followed by a -, modem will allow immediate entry. If password is followed by a + or nothing, modem will initiate callback. |
CALLBACK PARITY | |
Type: | Configuration |
Format: | AT [cmds] #Pn [cmds] |
Example: | AT #P0 #DB1 <CR> |
Description: | Sets the parity of the modem when in callback mode. |
Command | Function |
í #P0 | No parity. |
#P1 | Odd parity. |
#P2 | Even parity. |
CALLBACK PASSWORD | |
Type: | Configuration |
Format: | AT [cmds] #CBNnnxxxx |
Example: | AT#DB2 #CBN09snarf <CR> |
Description: | Sets the callback password at memory location nn to xxxx. The password must be between 6 and 10 characters, inclusive. |
CALLBACK SECURITY | |
Type: | Configuration |
Format: | AT [cmds] #DBn [cmds] |
Example: | AT #DB1 S0=1 <CR> |
Description: | Sets the security level of the callback function. |
Command | Function |
í #DB0 | Disables security and clears callback memory. |
#DB1 | Enables remote security only. |
#DB2 | Enables local and remote security. |
COMMAND ESCAPE TYPE | |
Type: | Configuration |
Format: | AT [cmds] %En [cmds] |
Example: | AT %E3 &W <CR> |
Description: | Sets type and response of command escape sequence. |
Command | Function |
%E0 | Command escape disabled. |
í %E1 | TIES escape (+++AT...) |
%E2 | <BREAK> AT method. |
%E3 | Both TIES and BREAK methods. |
%E4 | OK response to command escape disabled. |
%E5 | OK response to command escape enabled. |
COMMAND SET | |
Type: | Configuration |
Format: | AT &Qn |
Example: | AT &Q1 <CR> |
Description: | Selects standard Hayes or custom command sets. |
Command | Function |
í &Q0 | Multi-Tech custom command set enabled. |
&Q1 | Standard Hayes command set enabled. |
COMPRESSION | |
Type: | Configuration |
Format: | AT &En |
Example: | AT &E15 #L0 <CR> |
Description: | Selects data compression. |
Command | Function |
&E14 | Data compression disabled. |
í &E15 | Data compression enabled. |
COMPRESSION MODE | |
Type: | Configuration |
Format: | AT #Ln |
Example: | AT #L2 DT555-1212 <CR> |
Description: | Selects active compression protocols. |
Command | Function |
í #L0 | V.42 negotiation enabled. |
#L1 | MNP negotiation enabled. |
#L2 | LAP-M negotiation enabled. |
#L3 | LAP-M enabled, no negotiation. |
CTS SIGNAL | |
Type: | Configuration |
Format: | AT [cmds] &RFn [cmds] |
Example: | AT &RF0 <CR> |
Description: | Selects the function of the CTS signal. |
Command | Function |
&RF0 | CTS is set to RTS. |
í &RF1 | CTS is independent of RTS. |
DIAL STORED PHONE NUMBER | |
Type: | Immediate |
Format: | AT [cmds] Nn1 [Nn2, Nn3...] |
Example: | ATM0 N1N3N5 <CR> |
Description: | Dials stored phone number(s). If the first number is busy, the modem will proceed to the next number in the list. |
DSR SIGNAL | |
Type: | Configuration |
Format: | AT [cmds] &SFn [cmds] |
Example: | AT &SF0 <CR> |
Description: | Selects the function of the DSR signal. |
Command | Function |
í &SF0 | DSR is set to CD. |
&SF1 | DSR is independent of CD. |
DTR DIALING | |
Type: | Configuration |
Format: | AT [cmds] $Dn [cmds] |
Example: | AT $D1 DT555-1212 <CR> |
Description: | Turns DTR dialing on and off. |
Command | Function |
í $D0 | DTR dialing disabled. |
$D1 | DTR dialing enabled. |
DTR TIMEOUT | |
Type: | Register |
Format: | AT [cmds] S24=n [cmds] |
Example: | ATS24=40 <CR> |
Default: | 20 |
Range: | 0-255 |
Unit: | 50 ms |
Description: | Sets the time to drop the DTR signal to hangup. |
ERASE CALLBACK PASSWORD | |
Type: | Immediate |
Format: | AT [cmds] #RCBNn [cmds] |
Example: | AT #RCBN05 #RDN05 <CR> |
Description: | Erases the callback password at the memory location specified. |
ERASE CALLBACK NUMBER | |
Type: | Immediate |
Format: | AT [cmds] #RDNn [cmds] |
Example: | AT #RCBN05 #RDN05 <CR> |
Description: | Erases the callback phone number at the memory location specified. |
ERROR CORRECTION DISABLE ON CONNECT | |
Type: | Configuration |
Format: | AT [cmds] $Fn [cmds] |
Example: | AT $F1 DT555-1212 <CR> |
Description: | Selects whether error correction can be disabled by a <CR> while handshaking. |
Command | Function |
$F0 | Error correction handshake interrupt disabled. |
í $F1 | Error correction handshake interrupt enabled. |
ESCAPE SEQUENCE BUFFER SIZE | |
Type: | Register |
Format: | AT [cmds] S34=n [cmds] |
Example: | ATS34=30 <CR> |
Default: | 10 |
Range: | 0-60 |
Unit: | 1 byte |
Description: | Sets the size of the buffer used to store commands during an escape sequence. |
ESCAPE SEQUENCE - OUT OF BAND | |
Type: | Immediate |
Format: | <BREAK> AT [cmds]<CR> |
Example: | <BREAK> AT #F1<CR> |
Description: | Puts the modem in Command Mode. |
Notes: | Do not precede this command with AT. <BREAK> refers to the hardware modem break signal. |
ESCAPE SEQUENCE TIMEOUT | |
Type: | Register |
Format: | AT [cmds] S32=n [cmds] |
Example: | ATS32=30 <CR> |
Default: | 20 |
Range: | 0-255 |
Unit: | 1 second |
Description: | Sets the maximum amount of time the modem will wait for a <CR> while executing an escape sequence. |
FACTORY DEFAULTS | |
Type: | Immediate/Configuration |
Format: | AT &F[n] |
Example: | AT &F8 <CR> |
Description: | Loads factory defaults, or sets write protect on NVRAM. |
Command | Function |
&F | Reloads defaults by setting. (Immediate, see below.) |
í &F8 | Sets &F to read factory defaults from ROM, and disables NVRAM write protect. |
&F9 | Sets &F to read defaults from NVRAM, and enables write-protect. |
FALLBACK MODE | |
Type: | Configuration |
Format: | AT [cmds] #Fn [cmds] |
Example: | AT #F1 O <CR> |
Description: | Sets direction of fallback. |
Command | Function |
#F0 | Fallback disabled. |
#F1 | Fallback from 28.8Kbps to 2400bps as line quality degrades. |
í #F2 | Fallback from 2400bps to 28.8Kbps as line quality improves. |
FLOW CONTROL NORMAL MODE | |
Type: | Configuration |
Format: | AT [cmds] &En [cmds] |
Example: | AT &E11 O <CR> |
Description: | Selects normal flow control. |
Command | Function |
í &E10 | Normal mode disabled. |
&E11 | Normal mode enabled. |
FLOW CONTROL TYPE | |
Type: | Configuration |
Format: | AT [cmds] &En [cmds] |
Example: | AT &E4 &W <CR> |
Description: | Sets type of flow control used by modem. |
Command | Function |
&E3 | Flow control disabled. |
í &E4 | CTS/RTS flow control enabled. |
&E5 | XON/XOFF flow control enabled. |
HANDSHAKE ATTEMPTS | |
Type: | Configuration |
Format: | AT [cmds] #An [cmds] |
Example: | AT #A1 #L3 <CR> |
Description: | Configures the initial handshake phase. |
Command | Function |
#A0 | Attempts in order: 28.8Kbps, 24Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps, 2400bps, 1200bps, 300bps. |
#A1 | Attempts only 28.8Kbps. |
#A2 | Attempts in order: 28.8Kbps, 24Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps. |
#A3 | Attempts in order: 2400bps, 1200bps, 300bps. |
HELP SCREENS | |
Type: | Immediate |
Format: | AT $Hn |
Example: | AT $H1 <CR> |
Description: | Shows modem help screens. |
Command | Function |
$H1 | Shows help screen 1. |
$H2 | Shows help screen 2. |
$H3 | Shows help screen 3. |
LIST CONFIGURATION | |
Type: | Immediate |
Format: | AT Ln |
Example: | AT L5 <CR> |
Description: | Lists modem configuration. |
Command | Function |
L5 | Lists all settings. |
L6 | Lists the values of all S-registers. |
L7 | Lists extended parameters. |
L8 | Lists current diagnostics. |
LOCAL SERIAL PORT SPEED | |
Type: | Configuration |
Format: | AT [cmds] $SBnnn [cmds] |
Example: | AT $MB9600 $SB19200 <CR> |
Description: | Sets serial port speed. |
Command | Function |
$SB300 | Sets 300bps speed. |
$SB1200 | Sets 1200bps speed. |
$SB2400 | Sets 2400bps speed. |
$SB4800 | Sets 4800bps speed. |
$SB9600 | Sets 9600bps speed. |
$SB19200 | Sets 19.2Kbps speed. |
$SB38400 | Sets 38.4Kbps speed. |
$SB57600 | Sets 57.6Kbps speed. |
$SB115200 | Sets 115.2Kbps speed. |
LOCK SERIAL PORT | |
Type: | Configuration |
Format: | AT [cmds] $BAn [cmds] |
Example: | AT $SB57600 $BA0 <CR> |
Description: | Sets operation of serial port speed. |
Command | Function |
í $BA0 | Serial speed locked at rate set by $SB. |
$BA1 | Serial speed follows connect speed, ignoring $SB. |
LOGIN PASSWORD | |
Type: | Configuration |
Format: | AT [cmds] #Ixxxx |
Example: | AT #IMicroHouse <CR> |
Description: | Sets the login password to xxxx. The password must be between 6 and 10 characters, case sensitive. It defaults to MULTI-TECH. |
MAXIMUM BLOCK SIZE FOR TRANSMISSION | |
Type: | Configuration |
Format: | AT [cmds] &BSn [cmds] |
Example: | AT &BS1 &MB28800 <CR> |
Description: | Sets the maximum transmittable block size. |
Command | Function |
&BS0 | Maximum block size is 64 characters. |
í &BS1 | Maximum block size is 128 characters for LAP-M, and 256 characters for MNP. |
PACING | |
Type: | Configuration |
Format: | AT [cmds] &En [cmds] |
Example: | AT &E13 <CR> |
Description: | Selects ENQ/ACK pacing. |
Command | Function |
&E12 | Disables ENQ/ACK pacing. |
í &E13 | Enables ENQ/ACK pacing. |
PACING - ENQ/ACK | |
Type: | Configuration |
Format: | AT [cmds] &En [cmds] |
Example: | AT &E9 <CR> |
Description: | Selects ENQ/ACK pacing. |
Command | Function |
í &E8 | Enables ENQ/ACK pacing. |
&E9 | Disables ENQ/ACK pacing. |
POWER SAVING MODE | |
Type: | Register |
Format: | AT [cmds] S35=n [cmds] |
Example: | ATS35=2 <CR> |
Default: | 2 |
Range: | 0, 2 |
Unit: | N/A |
Description: | Selects power saving mode. |
Command | Function |
S35=0 | Power saving mode disabled. |
í S35=2 | Power saving mode enabled. |
REDIAL | |
Type: | Immediate |
Format: | ATA: |
Example: | ATA: <CR> |
Description: | Redials the last number dialed until it is no longer busy. |
REMOTE CONNECT SPEED | |
Type: | Configuration |
Format: | AT $MBnnn |
Example: | AT $MB9600 $SB19200 <CR> |
Description: | Sets maximum remote connect speed. |
Command | Function |
$MB75 | Sets V.23 (1200bps/75bps bi-directional). |
$MB300 | Sets 300bps connect. |
$MB1200 | Sets 1200bps connect. |
$MB2400 | Sets 2400bps connect. |
$MB4800 | Sets 4800bps connect. |
$MB9600 | Sets 9600bps connect. |
$MB14400 | Sets 14.4Kbps connect. |
$MB19200 | Sets 19.2Kbps connect. |
$MB28800 | Sets 28.8Kbps connect. |
RETRANSMIT FAIL ACTION | |
Type: | Configuration |
Format: | AT [cmds] $Rn [cmds] |
Example: | AT $R1 <CR> |
Description: | Sets whether the modem gives up on a bad connection. |
Command | Function |
í $R0 | Hang up after 12 failed retransmissions. |
$R1 | Do not hang up after 12 failed retransmissions. |
STORE PHONE NUMBER IN NVRAM | |
Type: | Configuration |
Format: | AT [cmds] D <#>Nn [dialstring] |
Example: | ATD555-1212N1 <CR> |
Description: | Stores a phone number in the modem’s memory. |
TRELLIS MODULATION | |
Type: | Configuration |
Format: | AT [cmds] #Tn [cmds] |
Example: | AT #T1 <CR> |
Description: | Controls Trellis Coded Modulation. |
Command | Function |
#T0 | Disables TCM. |
í #T1 | Enables TCM. |
V.42 MODE | |
Type: | Configuration |
Format: | AT [cmds] &En [cmds] |
Example: | AT &E0 <CR> |
Description: | Configures the operation of V.42 mode. |
Command | Function |
&E0 | Error correction disabled. |
í &E1 | V.42 set to auto-reliable. |
&E2 | V.42 set to reliable. |
XOFF SEND | |
Type: | Configuration |
Format: | AT [cmds] #Xn [cmds] |
Example: | AT #X1 <CR> |
Description: | Selects how XOFF signal is sent. |
Command | Function |
í #X0 | Single XOFF character sent until ready. |
#X1 | Multiple XOFF characters sent until ready. |
XON/XOFF PASS-THROUGH | |
Type: | Configuration |
Format: | AT [cmds] &En [cmds] |
Example: | AT &E7 O <CR> |
Description: | Selects whether XON/XOFF signals are sent to remote modem. |
Command | Function |
í &E6 | XON/XOFF signals trapped by local modem. |
&E7 | XON/XOFF passed through local modem. |