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# BUSINESSLAND INC.
2400 BPS INTERNAL MODEM (REV. A)
Card Type Data (asynchronous)
Chip Set Unidentified
Maximum Transfer Rate 2400bps
Data Bus 8-bit ISA
Data Modulation Protocol Bell 103/113/212A
ITU-T V.22, V.22bis
Error Correction/Compression MNP5, X.PC
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line out | CN1 | Line in | CN2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|-----------------------------------------+-------+----------|
| Factory configured - Do not alter | SW1/3 | Open |
|-----------------------------------------+-------+----------|
| Factory configured - Do not alter | SW1/4 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT ADDRESS |
|------------------------------------------------------------|
| Setting | SW1/1 | SW1/2 |
|--------------------+-------------------+-------------------|
| COM1 (3F8h) | Closed | Open |
|--------------------+-------------------+-------------------|
| í COM2 (2F8h) | Open | Open |
|--------------------+-------------------+-------------------|
| COM3 (3E8h) | Closed | Closed |
|--------------------+-------------------+-------------------|
| COM4 (2E8h) | Open | Closed |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| AUTO-RELIABLE FALLBACK CHARACTER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %An [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-127 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| Description: | Sets the character used as the |
| | auto-reliable fallback character. %A0 will |
| | disable this function. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO-RELIABLE TIME BUFFER CONFIGURATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Cn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the handling of incoming data |
| | during auto-reliable time period |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \C0 | Data is discarded |
|--------------+---------------------------------------------|
| \C1 | Data is buffered |
|--------------+---------------------------------------------|
| \C2 | Data is discarded, modem returns to normal |
| | mode on receiving auto-reliable fallback |
| | character |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S14 |
|------------------------------------------------------------|
| Format | AT [cmds] S14=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Unidentified |
|--------------+---------------------------------------------|
| Range: | 0-174 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls echo, result codes, result code |
| | display, dial mode, and answer/originate |
| | mode. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | 0 | Not used |
|------+-------+---------------------------------------------|
| 1 | 0 | Command echo disabled |
| | | |
| | 1 | Command echo enabled |
|------+-------+---------------------------------------------|
| 2 | 0 | Result codes enabled |
| | | |
| | 1 | Result codes disabled |
|------+-------+---------------------------------------------|
| 3 | 0 | Display result codes in numeric format |
| | | |
| | 1 | Display result codes in verbose format |
|------+-------+---------------------------------------------|
| 4 | 0 | Not used |
|------+-------+---------------------------------------------|
| 5 | 0 | Tone dial enabled |
| | | |
| | 1 | Pulse dial enabled |
|------+-------+---------------------------------------------|
| 6 | 0 | Not used |
|------+-------+---------------------------------------------|
| 7 | 0 | Answer mode enabled |
| | | |
| | 1 | Originate mode enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S21 |
|------------------------------------------------------------|
| Format | AT [cmds] S21=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Unidentified |
|--------------+---------------------------------------------|
| Range: | 0-184 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Selects low DTR action, DCD signal, and the |
| | long space disconnect function. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 2 - | 0 | Not used. |
| 0 | | |
|------+-------+---------------------------------------------|
| 4, 3 | 00 | DTR Forced |
| | | |
| | 01 | Modem goes to command mode on low DTR |
| | | |
| | 10 | Modem disconnects on low DTR. Auto-Answer |
| | | is disabled. |
| | 11 | |
| | | Modem is initialized on low DTR |
|------+-------+---------------------------------------------|
| 5 | 0 | DCD forced high |
| | | |
| | 1 | DCD normal |
|------+-------+---------------------------------------------|
| 6 | 0 | Not used |
|------+-------+---------------------------------------------|
| 7 | 0 | Long space disconnect function disabled |
| | | |
| | 1 | Long space disconnect function enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S22 |
|------------------------------------------------------------|
| Format | AT [cmds] S22=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Unidentified |
|--------------+---------------------------------------------|
| Range: | 0-252 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls speaker controls, limits results |
| | codes, and make/break ratio. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 1, 0 | 0 | Not used |
|------+-------+---------------------------------------------|
| 3, 2 | 00 | Speaker off |
| | | |
| | 01 | Speaker off on carrier |
| | | |
| | 10 | Speaker always on |
| | | |
| | 11 | Speaker on during handshake |
|------+-------+---------------------------------------------|
| 6, | 000 | Busy and dialtone detection disabled, |
| 5, 4 | | result codes 0-4 enabled. |
| | 100 | |
| | | Busy and dialtone detection disabled, |
| | 101 | result codes 0-5, 10 enabled. |
| | | |
| | 110 | Busy tone detection disabled, dialtone |
| | | detection enabled, result codes 0-6, 10 |
| | 111 | enabled. |
| | | |
| | | Busy tone detection enabled, dialtone |
| | | detection disabled, result codes 0-5, 7, 10 |
| | | enabled. |
| | | |
| | | Busy and dialtone detection enabled, result |
| | | codes 0-7, 10 enabled. |
|------+-------+---------------------------------------------|
| 7 | 0 | 39/61ms at 10pps (North America) |
| | | |
| | 1 | 33/67ms at 10pps (Europe) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S23 |
|------------------------------------------------------------|
| Format | AT [cmds] S23=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Unidentified |
|--------------+---------------------------------------------|
| Range: | 0-187 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Grants/denies remote digital loopback, |
| | controls DTE rate and parity, and sets |
| | guard tone. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | 0 | Remote digital loopback denied |
| | | |
| | 1 | Remote digital loopback allowed |
|------+-------+---------------------------------------------|
| 3, | 000 | Sets serial port speed to 0-300bps |
| 2, 1 | | |
| | 010 | Sets serial port speed to 1200bps |
| | | |
| | 011 | Sets serial port speed to 2400bps |
| | | |
| | 101 | Sets serial port speed to 9600bps |
|------+-------+---------------------------------------------|
| 5,4 | 00 | Parity even |
| | | |
| | 01 | Space Parity |
| | | |
| | 10 | Parity odd |
| | | |
| | 11 | Mark/No Parity |
|------+-------+---------------------------------------------|
| 7, 6 | 00 | Guard tone disabled |
| | | |
| | 01 | Guard tone 550Hz enabled |
| | | |
| | 10 | Guard tone 1800Hz enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Cn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects data compression |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %C0 | Data compression disabled |
|--------------+---------------------------------------------|
| í %C1 | Data compression enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY CURRENT COMMAND STATUS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \S [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays current setting of modem commands |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECT MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Nn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets connect mode |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \N0 | Normal mode enabled |
|--------------+---------------------------------------------|
| í \N1 | Direct mode enabled |
|--------------+---------------------------------------------|
| \N2 | MNP reliable mode enabled |
|--------------+---------------------------------------------|
| \N3 | MNP auto-reliable mode enabled |
|--------------+---------------------------------------------|
| \N4 | X.PC mode only enabled |
|--------------+---------------------------------------------|
| \N5 | MNP/X.PC answer mode enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONVERT TO RELIABLE MODE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Y [cmds] |
|--------------+---------------------------------------------|
| Description: | Initiates reliable mode link |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] D<#> [cmds] |
|--------------+---------------------------------------------|
| Description: | Dials telephone number according to any |
| | modifiers included in the string |
|--------------+---------------------------------------------|
| Modifier | Function |
|--------------+---------------------------------------------|
| D, | Dialing paused for amount of time specified |
| | in S8 register |
|--------------+---------------------------------------------|
| DT | Tone dialing enabled |
|--------------+---------------------------------------------|
| DP | Pulse dialing enabled |
|--------------+---------------------------------------------|
| DR | Reverse mode |
|--------------+---------------------------------------------|
| DS=n | Number in memory location n dialed |
|--------------+---------------------------------------------|
| D; | Modem returned to command mode after |
| | dialing. The semicolon can only be placed |
| | at the end of the dial command |
|--------------+---------------------------------------------|
| D! | Flash function initiated. Modem commanded |
| | to go on-hook for specified time |
|--------------+---------------------------------------------|
| DW | Dialing resumed following dial tone |
| | detection |
|--------------+---------------------------------------------|
| D@ | Modem waits for a ring-back signal followed |
| | by 5 seconds of silence prior to executing |
| | the rest of the dial string |
|--------------+---------------------------------------------|
| DX | Modem in X.PC mode for duration of call |
|--------------+---------------------------------------------|
| DM | Modem in MNP auto-reliable mode for |
| | duration of call |
|--------------+---------------------------------------------|
| DV | Modem in X.PC mode, send X.PC request |
| | string. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY ALL S-REGISTERS |
|------------------------------------------------------------|
| Type | Immediate |
|-------------+----------------------------------------------|
| Format | AT [cmds] %R [cmds] |
|-------------+----------------------------------------------|
| Description | Displays a value of all S-registers |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DSR AND CTS SIGNALS |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Dn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the function of the DSR and CTS |
| | signals |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \D0 | DSR and CTS forced high |
|--------------+---------------------------------------------|
| \D1 | DSR forced high and CTS follows CD |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Gn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects modem port flow control |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \G0 | Flow control disabled |
|--------------+---------------------------------------------|
| \G1 | Flow control enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets type of flow control used by modem |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \Q0 | Flow control disabled |
|--------------+---------------------------------------------|
| \Q1 | XON/XOFF flow control enabled |
|--------------+---------------------------------------------|
| \Q2 | CTS flow control to DTE enabled |
|--------------+---------------------------------------------|
| \Q3 | RTS/CTS flow control enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Tn [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-90 |
|--------------+---------------------------------------------|
| Unit: | 1 minute |
|--------------+---------------------------------------------|
| Description: | Sets the length of time that the modem does |
| | not receive information before it |
| | disconnects |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCK SERIAL PORT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Jn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets operation of serial port speed |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \J0 | Serial speed locked |
|--------------+---------------------------------------------|
| \J1 | Serial speed follows connect speed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RESULT CODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Vn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects extended result codes |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \V0 | Standard AT result codes enabled |
|--------------+---------------------------------------------|
| \V1 | Error correction result codes enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ON-LINE IN RELIABLE MODE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \O [cmds] |
|--------------+---------------------------------------------|
| Description: | Returns to on-line and requests reliable |
| | mode connection |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ON-LINE STATE/RDL TEST |
|------------------------------------------------------------|
| Type | Configuration |
|-------------+----------------------------------------------|
| Format | AT [cmds] On [cmds] |
|-------------+----------------------------------------------|
| Description | Starts/ends remote digital loopback test and |
| | puts the modem in on-line command mode |
|-------------+----------------------------------------------|
| Command | Function |
|-------------+----------------------------------------------|
| O0 | Return to on-line state |
|-------------+----------------------------------------------|
| O1 | End remote digital loopback test and return |
| | to on-line state |
|-------------+----------------------------------------------|
| O2 | Begin remote digital loopback test and |
| | return to on-line state |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PACKET TRANSMISSION DELAY |
|------------------------------------------------------------|
| Type | Register |
|-------------+----------------------------------------------|
| Format | AT [cmds] S50=n [cmds] |
|-------------+----------------------------------------------|
| Default | 25 |
|-------------+----------------------------------------------|
| Range | 10-255 |
|-------------+----------------------------------------------|
| Unit | 1 ms |
|-------------+----------------------------------------------|
| Description | Sets the maximum delay preceding a character |
| | from DTE until X.PC block is sent |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPORT INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays modem properties |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Reports product code |
|--------------+---------------------------------------------|
| I1 | Reports checksum |
|--------------+---------------------------------------------|
| I2 | Reports checksum result |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RETURN TO RELIABLE MODE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Z [cmds] |
|--------------+---------------------------------------------|
| Description: | Ends reliable mode link, initiate return to |
| | normal mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TEST MODES |
|------------------------------------------------------------|
| Format | AT [cmds] S16=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Unidentified |
|--------------+---------------------------------------------|
| Range: | 0-125 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls loopback tests, analog, digital, |
| | remote digital, and self tests. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | 0 | Local analog loopback not in progress |
| | | |
| | 1 | Local analog loopback in progress |
|------+-------+---------------------------------------------|
| 1 | 0 | Not used |
|------+-------+---------------------------------------------|
| 2 | 0 | Local digital loopback not in progress |
| | | |
| | 1 | Local digital loopback in progress |
|------+-------+---------------------------------------------|
| 3 | 0 | Modem not in remote digital loopback |
| | | |
| | 1 | Remote digital loopback in progress |
|------+-------+---------------------------------------------|
| 4 | 0 | Remote digital loopback not requested |
| | | |
| | 1 | Remote digital loopback requested |
|------+-------+---------------------------------------------|
| 5 | 0 | Remote digital loopback w/ self-test not in |
| | | progress |
| | 1 | |
| | | Remote digital loopback w/ self-test in |
| | | progress |
|------+-------+---------------------------------------------|
| 6 | 0 | Local analog loopback w/ self-test not in |
| | | progress |
| | 1 | |
| | | Local analog loopback w/ self-test in |
| | | progress |
+------------------------------------------------------------+
+------------------------------------------------------------+
| XON/XOFF PASS-THROUGH |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Xn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether XON/XOFF signals are sent |
| | to remote modem |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \X0 | XON/XOFF signals trapped by local modem |
|--------------+---------------------------------------------|
| \X1 | XON/XOFF passed through local modem |
+------------------------------------------------------------+
+------------------------------------------------------------+
| X.PC DISCONNECT |
|------------------------------------------------------------|
| Type | Immediate |
|-------------+----------------------------------------------|
| Format | AT [cmds] %H [cmds] |
|-------------+----------------------------------------------|
| Description | Modem will disconnect but still remain |
| | connected to network node |
+------------------------------------------------------------+