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# MULTI-TECH SYSTEMS, INC.
ISI3334/4, ISI3334/8, ISI3334/EC
Card Type Modem (asynchronous)
Processor Type 80186
Processor Speed 16MHz
Chip Set Unidentified
Maximum Onboard Memory 256KB RAM
Maximum Data Rate 33.6Kbps x 4 (8 with daughtercard)
Maximum Fax Rate 14.4Kbps x 4 (8 with daughtercard)
Data Bus 16-bit ISA
Fax Class Class II
Data Modulation Bell 103A/212A
Protocol
ITU-T V.22, V.22bis, V.32, V.32bis,
V.34
AT&T V.32terbo
Fax Modulation ITU-T V.17, V.21CH2, V.27ter, V.29
Protocol
Error MNP5, V.42, V.42bis
Correction/Compression
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------+-------+-------------------------+-------|
| Telephone line 1 | J1 | Telephone line 8 out | J8 |
| out | | | |
|------------------+-------+-------------------------+-------|
| Telephone line 2 | J2 | Header to daughterboard | J9A |
| out | | J9B | |
|------------------+-------+-------------------------+-------|
| Telephone line 3 | J3 | Header to main board | J9B |
| out | | J9A | |
|------------------+-------+-------------------------+-------|
| Telephone line 4 | J4 | Header to daughterboard | J10A |
| out | | J10B | |
|------------------+-------+-------------------------+-------|
| Telephone line 5 | J5 | Header to main board | J10B |
| out | | J10A | |
|------------------+-------+-------------------------+-------|
| Telephone line 6 | J6 | Header to daughterboard | J11A |
| out | | J11B | |
|------------------+-------+-------------------------+-------|
| Telephone line 7 | J7 | Header to main board | J11B |
| out | | J11A | |
|------------------------------------------------------------|
| Note: J5 through J8 will not be active unless the |
| daughtercard is installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|---------------------------------+-------+------------------|
| í Daughtercard is not installed | JP1 | Pins 1 & 2 |
| | | closed |
|---------------------------------+-------+------------------|
| Daughtercard is installed | JP1 | Pins 2 & 3 |
| | | closed |
+------------------------------------------------------------+
+----------------------------------------------------------------------+
| INTERRUPT SELECTION |
|----------------------------------------------------------------------|
|Setting|JP2/A |JP2/B |JP2/C |JP2/D |JP2/E |JP2/F |JP2/G |JP2/H |JP2/I |
|-------+------+------+------+------+------+------+------+------+------|
| 2 |Closed| Open | Open | Open | Open | Open | Open | Open | Open |
|-------+------+------+------+------+------+------+------+------+------|
| í 3 | Open |Closed| Open | Open | Open | Open | Open | Open | Open |
|-------+------+------+------+------+------+------+------+------+------|
| 4 | Open | Open |Closed| Open | Open | Open | Open | Open | Open |
|-------+------+------+------+------+------+------+------+------+------|
| 5 | Open | Open | Open |Closed| Open | Open | Open | Open | Open |
|-------+------+------+------+------+------+------+------+------+------|
| 7 | Open | Open | Open | Open |Closed| Open | Open | Open | Open |
|-------+------+------+------+------+------+------+------+------+------|
| 10 | Open | Open | Open | Open | Open |Closed| Open | Open | Open |
|-------+------+------+------+------+------+------+------+------+------|
| 11 | Open | Open | Open | Open | Open | Open |Closed| Open | Open |
|-------+------+------+------+------+------+------+------+------+------|
| 12 | Open | Open | Open | Open | Open | Open | Open |Closed| Open |
|-------+------+------+------+------+------+------+------+------+------|
| 15 | Open | Open | Open | Open | Open | Open | Open | Open |Closed|
+----------------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|------------------------------------------------------------|
|Setting|SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6|SW1/7|SW1/8|
|-------+------+------+------+------+------+-----+-----+-----|
| 000h | On | On | On | On | On | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 008h | Off | On | On | On | On | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 010h | On | Off | On | On | On | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 018h | Off | Off | On | On | On | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 020h | On | On | Off | On | On | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
|í 200h | On | On | On | On | On | On | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 7D8h | Off | Off | On | Off | Off | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 7E0h | On | On | Off | Off | Off | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 7E8h | Off | On | Off | Off | Off | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 7F0h | On | Off | Off | Off | Off | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 7F8h | Off | Off | Off | Off | Off | Off | Off | Off |
|------------------------------------------------------------|
| Note: A total of 256 base address settings are |
| available. The switches are a binary representation of |
| the decimal memory addresses. SW1/8 is the Most |
| Significant Bit and switch SW1/1 is the Least |
| Significant Bit. The switches have the following |
| decimal values: SW1/8=1024, SW1/7=512, SW1/6=256, |
| SW1/5=128, SW1/4=64, SW1/3=32, SW1/2=16, SW1/1=8. Turn |
| off the switches and add the values of the switches |
| that are off to obtain the correct memory address. |
| (Off=1, On=0) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SUPPORTED STANDARD COMMANDS |
|------------------------------------------------------------|
| Basic AT Commands |
|------------------------------------------------------------|
| +++, ‘comma’, A/ |
|------------------------------------------------------------|
| A, B, D, E, H, O, P, T, V, W, X, Y, Z |
|------------------------------------------------------------|
| &D, &F, &G, &P, &S, &T, &W |
|------------------------------------------------------------|
| S-Registers |
|------------------------------------------------------------|
| S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S30 |
|------------------------------------------------------------|
| Note: See MHI documentation for complete information. |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| ANSWER/ORIGINATE MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Rn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the modem will answer and |
| | originate calls in normal or reversed mode. |
|------------------------------------------------------------|
| Command | Function |
|----------------+-------------------------------------------|
| í R0 | Modem will answer calls in answer mode |
| | and originate calls in originate mode. |
|----------------+-------------------------------------------|
| R1 | Modem will answer calls in originate mode |
| | and originate calls in answer mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO-RELIABLE FALLBACK |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $Fn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether error correction can be |
| | disabled by a <CR> while handshaking. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| $F0 | Auto-reliable fallback disabled. |
|--------------+---------------------------------------------|
| í $F1 | Auto-reliable fallback enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO-RELIABLE TIME BUFFER CONFIGURATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $An [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the handling of incoming data |
| | during auto-reliable time period. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í $A0 | Data is discarded. |
|--------------+---------------------------------------------|
| $A1 | Data is buffered. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK LENGTH |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S17=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 250 |
|--------------+---------------------------------------------|
| Range: | 0 - 250 |
|--------------+---------------------------------------------|
| Unit: | 10 mS |
|--------------+---------------------------------------------|
| Description: | Sets the length of the break signal the |
| | modem will send to the local serial port. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUFFER SIZE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Bn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the modem’s transmit/receive buffer |
| | size. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &B0 | Normal buffer size. |
|--------------+---------------------------------------------|
| &B1 | Small buffer size. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CD SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Cn [cmds] |
|--------------+---------------------------------------------|
| Description: | Configures the behavior of the carrier |
| | detect signal. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &C0 | CD forced high. |
|--------------+---------------------------------------------|
| í &C1 | CD normal. |
|--------------+---------------------------------------------|
| &C2 | CD forced high except during disconnect. |
|--------------+---------------------------------------------|
| &C4 | Modem resets on low CD. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLEAR DOWN SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &CDn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the modem will send a clear |
| | down signal when disconnecting. |
|------------------------------------------------------------|
| Command | Function |
|-----------------+------------------------------------------|
| í &CD0 | Modem will not send clear down signal. |
|-----------------+------------------------------------------|
| &CD1 | Modem will send clear down signal. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMAND SET |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT &Qn |
|--------------+---------------------------------------------|
| 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 |
|--------------+---------------------------------------------|
| Description: | Selects data compression. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &E14 | Data compression disabled. |
|--------------+---------------------------------------------|
| í &E15 | Data compression enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT #Ln |
|--------------+---------------------------------------------|
| Description: | Selects active compression protocols. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #L0 | MNP and V.42 negotiation enabled. |
|--------------+---------------------------------------------|
| #L1 | MNP negotiation enabled. |
|--------------+---------------------------------------------|
| #L2 | V.42 negotiation enabled. |
|--------------+---------------------------------------------|
| #L3 | V.42 enabled with no negotiation. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CTS SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Rn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the behaviour of the CTS signal. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &R0 | CTS normal. |
|--------------+---------------------------------------------|
| í &R1 | CTS forced high in command mode. |
|--------------+---------------------------------------------|
| &R2 | CTS forced low for 1 second during |
| | disconnect. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CTS SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &RFn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the function of the CTS signal. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &RF0 | CTS follows RTS. |
|--------------+---------------------------------------------|
| í &RF1 | CTS normal. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA LENGTH |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $EBn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects 10- or 11-bit mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í $EB0 | Sets 10-bit mode. |
|--------------+---------------------------------------------|
| $EB1 | Sets 11-bit mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA PARITY |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Pn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the parity of the serial port. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #P0 | No parity. |
|--------------+---------------------------------------------|
| #P1 | Odd parity. |
|--------------+---------------------------------------------|
| #P2 | Even parity. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA PUMP TONE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $FCn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the data pump will transmit |
| | a 5 second 2100Hz tone. |
|------------------------------------------------------------|
| Command | Function |
|-------------------+----------------------------------------|
| $FC0 | Data pump will not transmit tone. |
|-------------------+----------------------------------------|
| í $FC1 | Data pump will transmit tone. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL STORED PHONE NUMBER |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Na [Nb, Nc...] |
|--------------+---------------------------------------------|
| Description: | Dials stored phone number(s). If the first |
| | number is busy, the modem will proceed to |
| | the next number in the list. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISCONNECT SIGNAL DROP - PBX |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S24=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 20 |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | 50 ms |
|--------------+---------------------------------------------|
| Description: | Sets the time to drop the DTR, CTS, and DCD |
| | signals on disconnect when modem is |
| | connected to a PBX. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY CONFIGURATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT Ln |
|--------------+---------------------------------------------|
| Description: | Displays modem configuration. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| L5 | Displays all settings. |
|--------------+---------------------------------------------|
| L6 | Displays the values of all S-registers. |
|--------------+---------------------------------------------|
| L7 | Displays extended parameters. |
|--------------+---------------------------------------------|
| L8 | Displays current diagnostics. |
|--------------+---------------------------------------------|
| L9 | Displays current signal strength. |
|--------------+---------------------------------------------|
| L10 | Displays current signal-to-noise ratio. |
|--------------+---------------------------------------------|
| L11 | Displays current noise level. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information requested about the |
| | modem. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Displays product identification code. |
|--------------+---------------------------------------------|
| I1 | Displays firmware revision. |
|--------------+---------------------------------------------|
| I2 | Displays product name. |
|--------------+---------------------------------------------|
| I3 | Factory use only. |
|--------------+---------------------------------------------|
| I5 | Displays DSP chip version. |
|--------------+---------------------------------------------|
| I9 | Displays modem features. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DSR SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &SFn [cmds] |
|--------------+---------------------------------------------|
| 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] |
|--------------+---------------------------------------------|
| Description: | Selects the DTR dialing function. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í $D0 | DTR dialing disabled. |
|--------------+---------------------------------------------|
| $D1 | DTR dialing enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DTR SIGNAL DROP |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S25=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | 100 ms |
|--------------+---------------------------------------------|
| Description: | Sets the time to drop the DTR signal on |
| | disconnect. A value of 0 sets this to 50 |
| | mS. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ESCAPE SEQUENCE BUFFER SIZE |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S34=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 10 |
|--------------+---------------------------------------------|
| Range: | 0-60 |
|--------------+---------------------------------------------|
| Unit: | 1 byte |
|--------------+---------------------------------------------|
| Description: | Sets the size of the buffer used to store |
| | entered commands during an escape sequence. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ESCAPE SEQUENCE RESPONSE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %En [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the response that the modem will give |
| | to an escape sequence. |
|--------------+---------------------------------------------|
| %E4 | OK response to command escape disabled. |
|--------------+---------------------------------------------|
| í %E5 | OK response to command escape enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ESCAPE SEQUENCE TIMEOUT |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S32=n [cmds] |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ESCAPE SEQUENCE TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %En [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the type of command escape sequence |
| | the modem will recognise. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %E0 | Command escape disabled. |
|--------------+---------------------------------------------|
| í %E1 | TIES escape (+++AT...) |
|--------------+---------------------------------------------|
| %E2 | <BREAK> AT method. |
|--------------+---------------------------------------------|
| %E3 | Both TIES and BREAK methods. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FALLBACK MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Fn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets direction of fallback. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| #F0 | Fallback disabled. |
|--------------+---------------------------------------------|
| #F1 | Fallback from 33.6Kbps to 2400bps as line |
| | quality degrades. |
|--------------+---------------------------------------------|
| í #F2 | Fallback from 2400bps to 33.6Kbps as line |
| | quality improves. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects flow control. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &E12 | Flow control disabled. |
|--------------+---------------------------------------------|
| í &E13 | Flow control enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL - ENQ/ACK |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects ENQ/ACK pacing. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &E8 | Enables ENQ/ACK pacing. |
|--------------+---------------------------------------------|
| &E9 | Disables ENQ/ACK pacing. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL IN NORMAL MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects XON/XOFF flow control for |
| | non-error-correcting connections. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &E10 | XON/XOFF disabled for non-error-correcting |
| | connections. |
|--------------+---------------------------------------------|
| &E11 | XON/XOFF enabled for non-error-correcting |
| | connections. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| 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] |
|--------------+---------------------------------------------|
| Description: | Configures the initial handshake phase. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #A0 | Attempts speeds in order: 33.6Kbps, |
| | 31.2Kbps, 28.8Kbps, 24Kbps, 21.6Kbps, |
| | 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, |
| | 9600bps, 4800bps, 2400bps, 1200bps, 300bps. |
|--------------+---------------------------------------------|
| #A1 | Attempts only 33.6Kbps. |
|--------------+---------------------------------------------|
| #A2 | Attempts speeds in order: 33.6Kbps, |
| | 31.2Kbps, 28.8Kbps, 24Kbps, 21.6Kbps, |
| | 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, |
| | 9600bps, 4800bps. |
|--------------+---------------------------------------------|
| #A3 | Attempts speeds in order: 2400bps, 1200bps, |
| | 300bps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HELP SCREENS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT $Hn |
|--------------+---------------------------------------------|
| Description: | Shows modem help screens. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| $H1 | Shows help screen 1. |
|--------------+---------------------------------------------|
| $H2 | Shows help screen 2. |
|--------------+---------------------------------------------|
| $H3 | Shows help screen 3. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCAL SERIAL PORT SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $SBnnn [cmds] |
|--------------+---------------------------------------------|
| 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. |
|--------------+---------------------------------------------|
| í $SB115200 | Sets 115.2Kbps speed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCK SERIAL PORT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $BAn [cmds] |
|--------------+---------------------------------------------|
| 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 |
|--------------+---------------------------------------------|
| 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] |
|--------------+---------------------------------------------|
| Description: | Sets the maximum transmittable block size |
| | for data compression modes. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &BS0 | Maximum block size is 64 characters. |
|--------------+---------------------------------------------|
| í &BS1 | Maximum block size is 256 characters in MNP |
| | mode and 128 characters in LAPM mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MAXIMUM LINE SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT $MBnnn |
|--------------+---------------------------------------------|
| Description: | Sets the maximum allowable data exchange |
| | rate attempted during handshake process. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| $MB75 | Sets V.23 (1200bps/75bps bi-directional). |
|--------------+---------------------------------------------|
| $MB300 | Sets 300bps maximum connect speed. |
|--------------+---------------------------------------------|
| $MB1200 | Sets 1200bps maximum connect speed. |
|--------------+---------------------------------------------|
| $MB2400 | Sets 2400bps maximum connect speed. |
|--------------+---------------------------------------------|
| $MB4800 | Sets 4800bps maximum connect speed. |
|--------------+---------------------------------------------|
| $MB9600 | Sets 9600bps maximum connect speed. |
|--------------+---------------------------------------------|
| $MB14400 | Sets 14.4Kbps maximum connect speed. |
|--------------+---------------------------------------------|
| $MB19200 | Sets 19.2Kbps maximum connect speed. |
|--------------+---------------------------------------------|
| $MB28800 | Sets 28.8Kbps maximum connect speed. |
|--------------+---------------------------------------------|
| í $MB33600 | Sets 33.6Kbps maximum connect speed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REDIAL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | A: |
|--------------+---------------------------------------------|
| Description: | Redials the last number dialed until it is |
| | no longer busy. |
|--------------+---------------------------------------------|
| Note: | Do not precede this command with AT or |
| | follow it with <CR>. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REMOTE CONFIGURATION CHARACTER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S13=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 37 |
|--------------+---------------------------------------------|
| Range: | 0 - 127 |
|--------------+---------------------------------------------|
| Unit: | 1 ASCII character |
|--------------+---------------------------------------------|
| Description: | Defines the character that, when sent four |
| | times within the guard time set by S12, |
| | will notify the remote modem that a remote |
| | configuration session has been requested. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables modem to send result codes to the |
| | DTE. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í Q0 | Result codes enabled. |
|--------------+---------------------------------------------|
| Q1 | Result codes disabled. |
|--------------+---------------------------------------------|
| Q2 | Dumb answer mode enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RETRANSMIT FAIL ACTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $Rn [cmds] |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SETUP PASSWORD |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Sxxxx |
|--------------+---------------------------------------------|
| Description: | Sets the setup password to xxxx. The |
| | password must be between 6 and 10 |
| | characters, case sensitive. It defaults to |
| | MODEMSETUP. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TEST MODES |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Un [cmds] |
|--------------+---------------------------------------------|
| Description: | Performs test modes. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| U0 | Begin local analog loopback test in |
| | originate mode. |
|--------------+---------------------------------------------|
| U1 | Begin local analog loopback test in answer |
| | mode. |
|--------------+---------------------------------------------|
| U2 | Request remote digital loopback |
|--------------+---------------------------------------------|
| U3 | Begin local digital loopback. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TIME UNTIL OFF HOOK ON HIGH DTR |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S37=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Sets the amount of time the modem will wait |
| | to pick up after the DTR signal goes high. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TIME UNTIL ON HOOK ON LOW DTR |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S36=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Sets the amount of time the modem will wait |
| | to hang up after the DTR signal goes low. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRELLIS CODING |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Tn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the modem will use trellis |
| | coding. |
|------------------------------------------------------------|
| Command | Function |
|-----------------------+------------------------------------|
| #T0 | Trellis coding disabled. |
|-----------------------+------------------------------------|
| í #T1 | Trellis coding enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.32terbo CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Vn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the V.32terbo protocol in answer |
| | mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #V0 | V.32terbo enabled. |
|--------------+---------------------------------------------|
| #V1 | V.32terbo disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.34 LINE PROBE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %DPn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the modem will read line |
| | probe information from the DSP chip during |
| | handshaking. |
|------------------------------------------------------------|
| Command | Function |
|-----------------+------------------------------------------|
| í %DP0 | Line probe information not read during |
| | handshaking. |
|-----------------+------------------------------------------|
| %DP1 | Line probe information read during |
| | handshaking. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.34 LINE PROBE - DISPLAY |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %DFn [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays V.34 line probe data. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| %DF0 | Displays V.34 line probe data in graph |
| | format. |
|---------------+--------------------------------------------|
| %DF1 | Displays V.34 line probe data in table |
| | format. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.34 - MAXIMUM LINE SPEED |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S48=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the maximum line speed the modem will |
| | attempt to connect at when in V.34 mode. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| í S48=0 | Modem will attempt to connect at 33.6Kbps. |
|---------------+--------------------------------------------|
| S48=4 | Modem will attempt to connect at 4800bps. |
|---------------+--------------------------------------------|
| S48=9 | Modem will attempt to connect at 9600bps. |
|---------------+--------------------------------------------|
| S48=12 | Modem will attempt to connect at 12Kbps. |
|---------------+--------------------------------------------|
| S48=14 | Modem will attempt to connect at 14.4Kbps. |
|---------------+--------------------------------------------|
| S48=16 | Modem will attempt to connect at 16.8Kbps. |
|---------------+--------------------------------------------|
| S48=19 | Modem will attempt to connect at 19.2Kbps. |
|---------------+--------------------------------------------|
| S48=21 | Modem will attempt to connect at 21.6Kbps. |
|---------------+--------------------------------------------|
| S48=26 | Modem will attempt to connect at 26.4Kbps. |
|---------------+--------------------------------------------|
| S48=28 | Modem will attempt to connect at 28.8Kbps. |
|---------------+--------------------------------------------|
| S48=31 | Modem will attempt to connect at 31.2Kbps. |
|---------------+--------------------------------------------|
| S48=33 | Modem will attempt to connect at 33.6Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.42 FAILURE REACTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the modem's reaction if it fails to |
| | connect with V.42. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &E0 | Error correction disabled. |
|--------------+---------------------------------------------|
| í &E1 | Modem will fall back to normal mode. |
|--------------+---------------------------------------------|
| &E2 | Modem will not fall back to normal mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| XOFF SEND |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #Xn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects how XOFF signal is sent. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #X0 | Single XOFF character are sent until the |
| | DTE responds. |
|--------------+---------------------------------------------|
| #X1 | Multiple XOFF characters are sent until the |
| | DTE responds. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| XON/XOFF PASS-THROUGH |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+