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# MULTITECH SYSTEMS, INC.
MT2834BC/MT2834BCI
Modem Type Data (synchronous/asynchronous)/Fax
Maximum Data Rate 28.8Kbps
Maximum Fax Rate 14.4Kbps
Data Bus 16-bit ISA
Fax Class Class I & II
Data Modulation Bell 103A/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.23, V.32,
V.32bis, V.34
AT&T V.32terbo
Fax Modulation ITU-T V.17, V.21CH2, V.27ter, V.29
Protocol
Error MNP2-5, V.42, V.42bis
Correction/Compression
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Line-in | CN1 | Line-out | CN2 |
+------------------------------------------------------------+
+-------------------------------------------------------------------------+
| INTERRUPT SELECTION |
|-------------------------------------------------------------------------|
|IRQ|JP1/A |JP1/B |JP1/C |JP1/D |JP1/E |JP1/F |JP1/G |JP1/H |JP1/I |JP1/J |
|---+------+------+------+------+------+------+------+------+------+------|
|» 3| Open |Closed| Open | Open | Open | Open | Open | Open | Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|2 |Closed| Open | Open | Open | Open | Open | Open | Open | Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|4 | Open | Open |Closed| Open | Open | Open | Open | Open | Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|5 | Open | Open | Open |Closed| Open | Open | Open | Open | Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|7 | Open | Open | Open | Open |Closed| Open | Open | Open | Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|10 | Open | Open | Open | Open | Open |Closed| Open | Open | Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|11 | Open | Open | Open | Open | Open | Open |Closed| Open | Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|12 | Open | Open | Open | Open | Open | Open | Open |Closed| Open | Open |
|---+------+------+------+------+------+------+------+------+------+------|
|14 | Open | Open | Open | Open | Open | Open | Open | Open |Closed| Open |
|---+------+------+------+------+------+------+------+------+------+------|
|16 | Open | Open | Open | Open | Open | Open | Open | Open | Open |Closed|
+-------------------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|------------------------------------------------------------|
|Address | SW1/1 | SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6 |SW1/7 |
|---------+-------+-------+------+------+------+------+------|
|100h | Off | On | On | On | On | On | On |
|---------+-------+-------+------+------+------+------+------|
|200h | On | Off | On | On | On | On | On |
|---------+-------+-------+------+------+------+------+------|
|300h | Off | Off | On | On | On | On | On |
|---------+-------+-------+------+------+------+------+------|
|400h | On | On | Off | On | On | On | On |
|---------+-------+-------+------+------+------+------+------|
|500h | Off | On | Off | On | On | On | On |
|---------+-------+-------+------+------+------+------+------|
|2E8h | Off | On | Off | Off | Off | On | Off |
|(COM4:) | | | | | | | |
|---------+-------+-------+------+------+------+------+------|
|» 2F8h | Off | Off | Off | Off | Off | On | Off |
|(COM2:) | | | | | | | |
|---------+-------+-------+------+------+------+------+------|
|3D8h | Off | Off | On | Off | Off | Off | Off |
|---------+-------+-------+------+------+------+------+------|
|3E0h | On | On | Off | Off | Off | Off | Off |
|---------+-------+-------+------+------+------+------+------|
|3E8h | Off | On | Off | Off | Off | Off | Off |
|(COM3:) | | | | | | | |
|---------+-------+-------+------+------+------+------+------|
|3F0h | On | Off | Off | Off | Off | Off | Off |
|---------+-------+-------+------+------+------+------+------|
|3F8h | Off | Off | Off | Off | Off | Off | Off |
|(COM1:) | | | | | | | |
|------------------------------------------------------------|
| Note: A total of 127 memory base I/O address settings are |
| available. The switches are a binary representation of the|
| hexadecimal addresses. Switch SW1/1 is the Least |
| Significant Bit and switch SW1/7 is the Most Significant |
| Bit. The switches have the following decimal values: |
| switch SW1/1=8, SW1/2=16, SW1/3=32, SW1/4=64, SW1/5=128, |
| SW1/6=256, SW1/7=512.Turn off the switches and add the |
| values of the off switches to obtain the correct base I/O |
| address. (on=0, off=1) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FACTORY CONFIGURED - DO NOT ALTER |
|------------------------------------------------------------|
| Switch | Position |
|-----------------------------+------------------------------|
| SW1/8 | On |
+------------------------------------------------------------+
Proprietary 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 |
|--------------+---------------------------------------------|
| » $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 |
|--------------+---------------------------------------------|
| » $EB0 | Sets 10-bit mode. |
|--------------+---------------------------------------------|
| $EB1 | Sets 11-bit mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CALLBACK ATTEMPTS |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S16=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS16=6<CR> |
|--------------+---------------------------------------------|
| Default: | 4 |
|--------------+---------------------------------------------|
| Range: | 1-255 |
|--------------+---------------------------------------------|
| Unit: | 1 attempt |
|--------------+---------------------------------------------|
| Description: | Sets the maximum number of login attempts |
| | after initial callback connection. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| » #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 |
|--------------+---------------------------------------------|
| » #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. |
|--------------+---------------------------------------------|
| » %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 |
|--------------+---------------------------------------------|
| » &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. |
|--------------+---------------------------------------------|
| » &E15 | Data compression enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT #Ln |
|--------------+---------------------------------------------|
| Example: | AT #L2 DT555-1212<CR> |
|--------------+---------------------------------------------|
| Description: | Selects active compression protocols. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » #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. |
|--------------+---------------------------------------------|
| » &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 |
|--------------+---------------------------------------------|
| » &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 |
|--------------+---------------------------------------------|
| » $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. |
|--------------+---------------------------------------------|
| » $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.) |
|--------------+---------------------------------------------|
| » &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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FAILED PASSWORD ATTEMPTS |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S26? |
|--------------+---------------------------------------------|
| Example: | ATS26?<CR> |
|--------------+---------------------------------------------|
| Default: | Read-only |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 attempt |
|--------------+---------------------------------------------|
| Description: | This register stores the number of failed |
| | password attempts. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
|--------------+---------------------------------------------|
| » #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 |
|--------------+---------------------------------------------|
| » &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. |
|--------------+---------------------------------------------|
| » &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, |
| | 21.6Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, |
| | 12Kbps, 9600bps, 4800bps, 2400bps, 1200bps, |
| | 300bps. |
|--------------+---------------------------------------------|
| #A1 | Attempts only 28.8Kbps. |
|--------------+---------------------------------------------|
| #A2 | Attempts in order: 28.8Kbps, 24Kbps, |
| | 21.6Kbps, 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 300baud speed. |
|--------------+---------------------------------------------|
| $SB1200 | Sets 1200baud speed. |
|--------------+---------------------------------------------|
| $SB2400 | Sets 2400baud speed. |
|--------------+---------------------------------------------|
| $SB4800 | Sets 4800baud speed. |
|--------------+---------------------------------------------|
| $SB9600 | Sets 9600baud speed. |
|--------------+---------------------------------------------|
| $SB19200 | Sets 19.2Kbaud speed. |
|--------------+---------------------------------------------|
| $SB38400 | Sets 38.4Kbaud speed. |
|--------------+---------------------------------------------|
| $SB57600 | Sets 57.6Kbaud speed. |
|--------------+---------------------------------------------|
| $SB115200 | Sets 115.2Kbaud 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 |
|--------------+---------------------------------------------|
| » $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. |
|--------------+---------------------------------------------|
| » &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. |
|--------------+---------------------------------------------|
| » &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 |
|--------------+---------------------------------------------|
| » &E8 | Enables ENQ/ACK pacing. |
|--------------+---------------------------------------------|
| &E9 | Disables ENQ/ACK pacing. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| » $R0 | Hang up after 12 failed retransmissions. |
|--------------+---------------------------------------------|
| $R1 | Do not hang up after 12 failed |
| | retransmissions. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SETUP INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S29=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS29=5<CR> |
|--------------+---------------------------------------------|
| Default: | 20 |
|--------------+---------------------------------------------|
| Range: | 1-255 |
|--------------+---------------------------------------------|
| Unit: | 1 minute |
|--------------+---------------------------------------------|
| Description: | Sets the maximum amount of time between |
| | commands until the setup password must be |
| | re-entered. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TIME UNTIL HANG UP ON LOW DTR |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S36=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS36=5<CR> |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Sets the maximum amount of time the modem |
| | will wait to hang up after the DTR signal |
| | goes low. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TIME UNTIL PICK UP ON HIGH DTR |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S37=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS37=5<CR> |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Sets the maximum amount of time the modem |
| | will wait to pick up after the DTR signal |
| | goes high. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRELLIS MODULATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Tn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT #T1<CR> |
|--------------+---------------------------------------------|
| Description: | Controls Trellis Coded Modulation. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| #T0 | Disables TCM. |
|--------------+---------------------------------------------|
| » #T1 | Enables TCM. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| UUCP SPOOFING |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $SPn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT $SP1 O<CR> |
|--------------+---------------------------------------------|
| Description: | Controls the UUCP spoofing function. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » $SP0 | Spoofing disabled. |
|--------------+---------------------------------------------|
| $SP1 | Spoofing enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.32terbo CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Vn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT #V1 DT555-1212<CR> |
|--------------+---------------------------------------------|
| Description: | Controls the V.32terbo protocol in answer |
| | mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » #V0 | V.32terbo enabled. |
|--------------+---------------------------------------------|
| #V1 | V.32terbo disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
|--------------+---------------------------------------------|
| » &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 |
|--------------+---------------------------------------------|
| » #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 |
|--------------+---------------------------------------------|
| » &E6 | XON/XOFF signals trapped by local modem. |
|--------------+---------------------------------------------|
| &E7 | XON/XOFF passed through local modem. |
+------------------------------------------------------------+