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# MULTI-TECH SYSTEMS, INC.
MT224EH/MT224EHI
Modem Type Data (synchronous/asynchronous)
Maximum Data Rate 2400bps
Data Bus External
Data Modulation Protocol Bell 103A/212A
ITU-T V.21, V.22, V.22bis, V.23
Error Correction/Compression MNP5
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| DC power | CN1 | Line in | CN4 |
|------------------+----------+-------------------+----------|
| RS-232/422 | CN2 | Power switch | SW1 |
|------------------+----------+-------------------+----------|
| Line out | CN3 | Volume | R1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ASYNCHRONOUS/SYNCHRONOUS |
|------------------------------------------------------------|
| Settings | SW5/D |
|-------------------------------+----------------------------|
| Synchronous | On |
|-------------------------------+----------------------------|
| » Asynchronous | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO-ANSWER |
|------------------------------------------------------------|
| Settings | SW4/E |
|-------------------------------------+----------------------|
| » Enable auto answer/originate | On |
|-------------------------------------+----------------------|
| Disable/answer | Off |
|------------------------------------------------------------|
| Note: When SW5/B is set for Lease Line operation, the |
| options on this switch change to Originate and Answer |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BLIND/WAIT DIALING |
|------------------------------------------------------------|
| Settings | SW5/C |
|-------------------------------+----------------------------|
| » Blind dialing | Off |
|-------------------------------+----------------------------|
| Wait for dial tone | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BAUD RATE |
|------------------------------------------------------------|
| Settings | SW2 |
|-----------------------------+------------------------------|
| 1200bps | Position 1 |
|-----------------------------+------------------------------|
| 300bps | Position 2 |
|-----------------------------+------------------------------|
| 2400bps | Position 3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CD/DSR |
|------------------------------------------------------------|
| Settings | SW4/F |
|-------------------------------+----------------------------|
| » CD/DSR normal | On |
|-------------------------------+----------------------------|
| CD/DSR forced high | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMAND CHARACTERS |
|------------------------------------------------------------|
| Settings | SW4/D |
|-------------------------------+----------------------------|
| » Echo enable | On |
|-------------------------------+----------------------------|
| Echo disable | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMAND MODE |
|------------------------------------------------------------|
| Settings | SW4/H |
|-------------------------------+----------------------------|
| » Enable | Off |
|-------------------------------+----------------------------|
| Disable | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CTS |
|------------------------------------------------------------|
| Settings | SW5/A |
|-------------------------------+----------------------------|
| » CTS forced high | On |
|-------------------------------+----------------------------|
| CTS normal | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CTS/RTS |
|------------------------------------------------------------|
| Settings | JP2 |
|----------------------------------+-------------------------|
| » CTS follows RTS | Pins 1 & 2 closed |
|----------------------------------+-------------------------|
| CTS forced high until disconnect | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DSR |
|------------------------------------------------------------|
| Settings | JP3 |
|-----------------------------+------------------------------|
| » DSR follows CD | Pins 2 & 3 closed |
|-----------------------------+------------------------------|
| DSR follows OH | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FORCED DTR |
|------------------------------------------------------------|
| Settings | SW4/A |
|-------------------------------+----------------------------|
| » DTR forced high | Off |
|-------------------------------+----------------------------|
| DTR normal | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| JACK TYPE |
|------------------------------------------------------------|
| Settings | SW4/G |
|-------------------------------+----------------------------|
| » RJ11 | On |
|-------------------------------+----------------------------|
| RJ12/13 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES |
|------------------------------------------------------------|
| Settings | SW4/B |
|-------------------------------+----------------------------|
| » Verbose | On |
|-------------------------------+----------------------------|
| Terse | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES |
|------------------------------------------------------------|
| Settings | SW4/C |
|-------------------------------+----------------------------|
| » Enable | Off |
|-------------------------------+----------------------------|
| Disable | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RTS |
|------------------------------------------------------------|
| Settings | JP1 |
|------------------------------+-----------------------------|
| » RTS forced high | Pins 1 & 2 closed |
|------------------------------+-----------------------------|
| RTS normal | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SWITCHED/LEASE LINE |
|------------------------------------------------------------|
| Settings | SW5/B |
|-------------------------------+----------------------------|
| » Switched | On |
|-------------------------------+----------------------------|
| Lease line | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE/DATA MODE |
|------------------------------------------------------------|
| Settings | SW3 |
|-----------------------------+------------------------------|
| Answer | Position 1 |
|-----------------------------+------------------------------|
| Originate | Position 2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-----+-------+----------+-----------------------------------|
| SD | Red | On | Modem is transmitting data |
|-----+-------+----------+-----------------------------------|
| SD | Red | Off | Modem is not transmitting data |
|-----+-------+----------+-----------------------------------|
| RD | Red | On | Modem is receiving data |
|-----+-------+----------+-----------------------------------|
| RD | Red | Off | Modem is not receiving data |
|-----+-------+----------+-----------------------------------|
| CD | Red | On | Carrier signal detected |
|-----+-------+----------+-----------------------------------|
| CD | Red | Off | Carrier signal not detected |
|-----+-------+----------+-----------------------------------|
| 24 | Red | Blinking | Modem connected at 2400bps in |
| | | fast | reliable mode |
|-----+-------+----------+-----------------------------------|
| 24 | Red | Blinking | Modem connected at 2400bps with |
| | | slow | data compression |
|-----+-------+----------+-----------------------------------|
| 24 | Red | Off | Modem not connected at 2400bps |
|-----+-------+----------+-----------------------------------|
| 12 | Red | Blinking | Modem connected at 1200bps in |
| | | fast | reliable mode |
|-----+-------+----------+-----------------------------------|
| 12 | Red | Blinking | Modem connected at 1200bps with |
| | | slow | data compression |
|-----+-------+----------+-----------------------------------|
| 12 | Red | Off | Modem not connected at 1200bps |
|-----+-------+----------+-----------------------------------|
| OH | Red | On | Modem is off-hook |
|-----+-------+----------+-----------------------------------|
| OH | Red | Off | Modem is on-hook |
|-----+-------+----------+-----------------------------------|
| TR | Red | On | DTR signal is high |
|-----+-------+----------+-----------------------------------|
| TR | Red | Off | DTR signal is low |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| AUTO-RELIABLE TIME BUFFER CONFIGURATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $An [cmds] |
|--------------+---------------------------------------------|
| Example: | AT $A1 &W<CR> |
|--------------+---------------------------------------------|
| Description: | Controls the handling of incoming data |
| | during auto-reliable time period. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » $AO | Data is discarded. |
|--------------+---------------------------------------------|
| $A1 | Data is buffered. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BLIND DIALING |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Bn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT B0 <CR> |
|--------------+---------------------------------------------|
| Description: | Selects blind dial or wait-for-dial-tone. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » B0 | Modem will blind dial. |
|--------------+---------------------------------------------|
| B1 | Modem will wait for dial tone before |
| | dialing. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUFFER SIZE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Bn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &B0<CR> |
|--------------+---------------------------------------------|
| Description: | Selects the modem’s transmit/receive buffer |
| | size. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » &B0 | Normal buffer size. |
|--------------+---------------------------------------------|
| &B1 | Small buffer size. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CD SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Cn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &C3 $D0<CR> |
|--------------+---------------------------------------------|
| Description: | Configures the behavior of the carrier |
| | detect signal. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &C0 | CD forced high. |
|--------------+---------------------------------------------|
| » &C1 | CD normal. |
|--------------+---------------------------------------------|
| &C2 | CD forced high except during disconnect. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMAND SET |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Qn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &Q0<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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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/CTS/CD 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 DSR, CTS, and CD |
| | signals to hangup. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DTR DIALING |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $Dn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT $D1 DT555-1212<CR> |
|--------------+---------------------------------------------|
| Description: | Selects the DTR dialing function. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » $D0 | DTR dialing disabled. |
|--------------+---------------------------------------------|
| $D1 | DTR dialing enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DTR TIMEOUT |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S25=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS25=30<CR> |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | Sets the time to drop the DTR signal to |
| | hangup. |
|--------------+---------------------------------------------|
| Note: | Setting S25 to 0 sets the DTR timeout to 50 |
| | ms. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DUPLEX |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Fn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT F1 &W<CR> |
|--------------+---------------------------------------------|
| Description: | Controls duplex mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| F0 | Half duplex enabled. |
|--------------+---------------------------------------------|
| » F1 | Full duplex enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FACTORY DEFAULTS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT &F |
|--------------+---------------------------------------------|
| Example: | AT &F<CR> |
|--------------+---------------------------------------------|
| Description: | Loads factory defaults from ROM and |
| | DIP-switches. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &E13<CR> |
|--------------+---------------------------------------------|
| Description: | Selects flow control. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &E12 | Flow control disabled. |
|--------------+---------------------------------------------|
| » &E13 | Flow control enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL - ENQ/ACK |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &E8<CR> |
|--------------+---------------------------------------------|
| Description: | Selects ENQ/ACK pacing. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » &E8 | Disables ENQ/ACK pacing. |
|--------------+---------------------------------------------|
| &E9 | Enables ENQ/ACK pacing. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL IN NORMAL MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &E11 O<CR> |
|--------------+---------------------------------------------|
| Description: | Selects XON/XOFF flow control for |
| | non-error-correcting connections. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » &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] |
|--------------+---------------------------------------------|
| Example: | AT &E3 &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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
|--------------+---------------------------------------------|
| $H4 | Shows help screen 4. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &In [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &I5 S30=40<CR> |
|--------------+---------------------------------------------|
| Description: | Sets the length of time that the modem does |
| | not receive information before it |
| | disconnects. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » &I0 | Inactivity timer disabled. |
|--------------+---------------------------------------------|
| &I1 | Modem will disconnect after 10 minutes of |
| | inactivity. |
|--------------+---------------------------------------------|
| &I2 | Modem will disconnect after 30 minutes of |
| | inactivity. |
|--------------+---------------------------------------------|
| &I3 | Modem will disconnect after 60 minutes of |
| | inactivity. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LIST CONFIGURATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT Ln |
|--------------+---------------------------------------------|
| Example: | AT L5<CR> |
|--------------+---------------------------------------------|
| Description: | Lists modem configuration. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| L0 | Lists all phone numbers in memory. |
|--------------+---------------------------------------------|
| L5 | Lists all settings. |
|--------------+---------------------------------------------|
| L6 | Lists the values of all S-registers. |
|--------------+---------------------------------------------|
| L7 | Lists extended parameters. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCAL SERIAL PORT SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $SBnnn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT $MB9600 $SB19200<CR> |
|--------------+---------------------------------------------|
| Description: | Sets serial port speed. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| $SB110 | Sets 110bps speed. |
|--------------+---------------------------------------------|
| $SB300 | Sets 300bps speed. |
|--------------+---------------------------------------------|
| $SB1200 | Sets 1200bps speed. |
|--------------+---------------------------------------------|
| » $SB2400 | Sets 2400bps speed. |
|--------------+---------------------------------------------|
| $SB4800 | Sets 4800bps speed. |
|--------------+---------------------------------------------|
| $SB9600 | Sets 9600bps 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOOPBACK TEST MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Un [cmds] |
|--------------+---------------------------------------------|
| Example: | AT U2 &W<CR> |
|--------------+---------------------------------------------|
| Description: | Places modem in test mode. |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 256 characters. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PROTOCOL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Vn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &V1 <CR> |
|--------------+---------------------------------------------|
| Description: | Selects the protocol for low-speed data |
| | calls. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &V0 | Bell protocols. |
|--------------+---------------------------------------------|
| » &V1 | ITU-T protocols. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REDIAL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | A: |
|--------------+---------------------------------------------|
| Example: | 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 CONNECT SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT $MBnnn |
|--------------+---------------------------------------------|
| Example: | AT $MB2400 $SB19200<CR> |
|--------------+---------------------------------------------|
| Description: | Sets maximum remote connect speed. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| $MB75 | Sets V.23 (1200bps/75bps bi-directional). |
|--------------+---------------------------------------------|
| $MB110 | Sets 110bps connect. |
|--------------+---------------------------------------------|
| $MB300 | Sets 300bps connect. |
|--------------+---------------------------------------------|
| $MB1200 | Sets 1200bps connect. |
|--------------+---------------------------------------------|
| » $MB2400 | Sets 2400bps 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| STORE PHONE NUMBER IN NVRAM |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] D<#>N<0-9> |
|--------------+---------------------------------------------|
| Example: | ATD1(303)-443-3323N6 <CR> |
|--------------+---------------------------------------------|
| Description: | Stores a phone number in the modem’s |
| | memory. Only the dialstring before the Nn |
| | will be stored. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WAIT FOR DIAL TONE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] W [cmds] |
|--------------+---------------------------------------------|
| Example: | AT W <CR> |
|--------------+---------------------------------------------|
| Description: | Wait for new dial tone. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| XON/XOFF PASS-THROUGH |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &En [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &E6 <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. |
+------------------------------------------------------------+