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# ASPEN TECHNOLOGIES, INC.
28IDSSA, 28ISSA
Card Type Modem (asynchronous)
Chipset Sierra
I/O Options Microphone in, speaker out, voice
Maximum Data Rate 28.8Kbps
Maximum Fax Rate 14.4Kbps
Data Modulation Bell 103A, 212A
ITU-T V.21, V.22, V.22bis, V.32,
V.32bis, V.34
Fax Modulation Unidentified
Error MNP5, V.42, V.42bis
Correction/Compression
Fax Class Class I & II
Data Bus 16-bit ISA
Card Size Full height, half length
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|-------------------+---------+---------------------+--------|
| Telephone line | CN1 | Microphone in or | CN3 |
| | | speaker out | |
|-------------------+---------+---------------------+--------|
| Telephone line | CN2 | Microphone in or | CN4 |
| | | speaker out | |
|------------------------------------------------------------|
| Note: It is not identified which of CN3 and CN4 is |
| the microphone in jack and which is the speaker out |
| jack. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+-------+-----------|
| Audio volume set to high setting | JP4 | Closed |
|----------------------------------------+-------+-----------|
| Audio volume set to low setting | JP4 | Open |
|----------------------------------------+-------+-----------|
| Audio jacks are stereo | JP5 | Closed |
|----------------------------------------+-------+-----------|
| Audio jacks are monaural | JP5 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SUPPORTED STANDARD COMMANDS |
|------------------------------------------------------------|
| Basic AT Commands |
|------------------------------------------------------------|
| +++, ‘comma’, A/ |
|------------------------------------------------------------|
| A, D, E, H, L, M, O, P, Q, T, V, X, Y, Z |
|------------------------------------------------------------|
| &C, &D, &F, &T, &V, &W, &Y, &Z |
|------------------------------------------------------------|
| Extended AT Commands |
|------------------------------------------------------------|
| \Q |
|------------------------------------------------------------|
| %A, %C, %Q |
|------------------------------------------------------------|
| S-Registers |
|------------------------------------------------------------|
| S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S12, S18, |
| S25, S26, S38 |
|------------------------------------------------------------|
| Note: See MHI help file for complete information. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| UNIDENTIFIED COMMANDS |
|------------------------------------------------------------|
| Command | Default |
|----------------------------+-------------------------------|
| S40 | Unidentified |
|----------------------------+-------------------------------|
| S41 | Unidentified |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| ANSWER MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %On [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects when the modem will be in answer |
| | mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %O0 | Modem automatically enters answer mode when |
| | line rings. |
|--------------+---------------------------------------------|
| %O1 | Modem is always in answer mode. |
|--------------+---------------------------------------------|
| %O2 | Modem auto-answers calls in originate mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO-FALLBACK/FALL-FORWARD |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &An [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls auto-fallback/fall-forward mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &A0 | Auto-fallback/fall-forward disabled. |
|--------------+---------------------------------------------|
| &A1 | Auto-fallback/fall-forward enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO-RELIABLE TIME BUFFER CONFIGURATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Cn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the handling of incoming data |
| | during the auto-reliable negotiation time |
| | period. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \C0 | Data is discarded. |
|--------------+---------------------------------------------|
| \C1 | Data is buffered for 4 seconds or 200 |
| | characters. |
|--------------+---------------------------------------------|
| í \C2 | Data is discarded; modem returns to normal |
| | mode on receiving auto-reliable fallback |
| | character. |
|--------------+---------------------------------------------|
| \C3 | Data is buffered for 4 seconds or 200 |
| | characters. Modem uses V.14 to fall back to |
| | normal mode. |
|--------------+---------------------------------------------|
| \C4 | Data is discarded; modem returns to normal |
| | mode on receiving auto-reliable fallback |
| | character. Modem uses V.14 to fall back to |
| | normal mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Configures action of break signal. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \K0 | Break sent to remote modem immediately and |
| | buffers cleared. |
|--------------+---------------------------------------------|
| \K1 | Break sent to remote modem immediately and |
| | buffers not cleared. |
|--------------+---------------------------------------------|
| \K2 | Break sent with transmitted data. |
|--------------+---------------------------------------------|
| \K3 | Breaks ignored. |
|--------------+---------------------------------------------|
| \K4 | Break sent with transmitted data until no |
| | break character is detected. |
|--------------+---------------------------------------------|
| \K5 | Break sent with transmitted data until no |
| | break character is detected. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHARACTER ABORT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the character abort function. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %K0 | Character abort enabled with 2 second |
| | delay. |
|--------------+---------------------------------------------|
| %K1 | Character abort disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECT MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Nn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the type of connection the modem |
| | will make. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \N0 | Normal mode enabled. |
|--------------+---------------------------------------------|
| \N1 | Direct mode enabled. |
|--------------+---------------------------------------------|
| \N2 | MNP reliable mode enabled. |
|--------------+---------------------------------------------|
| í \N3 | Auto-reliable mode or MNP auto-reliable |
| | mode enabled. |
|--------------+---------------------------------------------|
| \N4 | V.42 reliable mode enabled. |
|--------------+---------------------------------------------|
| \N5 | V.42 auto-reliable mode or MNP |
| | auto-reliable mode enabled. |
|--------------+---------------------------------------------|
| \N6 | V.13 half-duplex simulation mode enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA FORMAT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Bn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the data size and parity the modem |
| | will use if no AT command is sent for it to |
| | auto-detect. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \B0 | 6 data bits, no parity, 1 stop bit. |
|--------------+---------------------------------------------|
| \B1 | 7 data bits, no parity, 1 stop bit. |
|--------------+---------------------------------------------|
| \B2 | 7 data bits, 1 stop bit, parity type set by |
| | \P command. |
|--------------+---------------------------------------------|
| \B3 | 8 data bits, no parity, 1 stop bit. |
|--------------+---------------------------------------------|
| \B4 | 7 data bits, 2 stop bits, parity type set |
| | by \P command. |
|--------------+---------------------------------------------|
| \B5 | 8 data bits, 1 stop bit, parity type set by |
| | \P command. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA PARITY |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Pn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the parity of the local serial port |
| | data. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \P0 | Even parity selected. |
|--------------+---------------------------------------------|
| \P1 | SPACE parity selected. |
|--------------+---------------------------------------------|
| \P2 | Odd parity selected. |
|--------------+---------------------------------------------|
| \P3 | Mark parity selected. |
|--------------+---------------------------------------------|
| \P4 | Auto-detect parity from last entered AT |
| | command. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information requested about the |
| | modem. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Displays product identification code. |
|--------------+---------------------------------------------|
| I3 | Displays firmware revision. |
|--------------+---------------------------------------------|
| I4 | Displays modem configuration. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DSR SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Sn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the behaviour of the DSR signal. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &S0 | DSR forced high except at disconnect. |
|--------------+---------------------------------------------|
| &S1 | DSR normal. |
|--------------+---------------------------------------------|
| &S2 | DSR follows DCD. |
|--------------+---------------------------------------------|
| &S3 | DSR forced high. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DSR SIGNAL - TEST MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Dn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the behaviour of the DSR signal |
| | when the modem is in analog loopback test |
| | mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %D0 | DSR forced high. |
|--------------+---------------------------------------------|
| í %D1 | DSR forced low. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DTR DIALING |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Zn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the the modem's reaction to the DTR |
| | signal going high. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %Z0 | DTR dialing disabled. |
|--------------+---------------------------------------------|
| %Z1 | Modem will dial stored number. |
|--------------+---------------------------------------------|
| %Z2 | Modem will go off-hook and attempt to |
| | connect. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RESULT CODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Vn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects error correction and compression |
| | extended result codes. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \V0 | Modem returns CONNECT message after |
| | connecting and PROTOCOL: message after the |
| | link is negotiated; modem returns DCE rate. |
|--------------+---------------------------------------------|
| \V1 | Modem returns CONNECT and PROTOCOL: |
| | messages after the link is negotiated; |
| | modem returns DTE rate. |
|--------------+---------------------------------------------|
| \V2 | Modem returns CONNECT /REL message after |
| | the link is negotiated; modem returns DTE |
| | rate. |
|--------------+---------------------------------------------|
| í \V3 | Error correction and compression extended |
| | result codes disabled; modem returns DCE |
| | rate for normal connections and DTE rate |
| | for error correcting connections. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL - MODEM TO MODEM |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Gn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects modem-to-modem flow control. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \G0 | Flow control disabled. |
|--------------+---------------------------------------------|
| \G1 | Flow control enabled. |
|--------------+---------------------------------------------|
| \G2 | Flow control enabled on transmit only. |
|--------------+---------------------------------------------|
| \G3 | Pass-through flow control enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCAL SERIAL PORT SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Tn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the speed of the local serial port. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \T0 | Auto-detect current serial port speed. |
|--------------+---------------------------------------------|
| í \T1 | Set speed to speed of last AT command. |
|--------------+---------------------------------------------|
| \T2 | Set speed to 300bps. |
|--------------+---------------------------------------------|
| \T3 | Set speed to 1200bps. |
|--------------+---------------------------------------------|
| \T4 | Set speed to 2400bps. |
|--------------+---------------------------------------------|
| \T5 | Set speed to 4800bps. |
|--------------+---------------------------------------------|
| \T6 | Set speed to 7200bps. |
|--------------+---------------------------------------------|
| \T7 | Set speed to 9600bps. |
|--------------+---------------------------------------------|
| \T8 | Set speed to 12Kbps. |
|--------------+---------------------------------------------|
| \T9 | Set speed to 14.4Kbps. |
|--------------+---------------------------------------------|
| \T10 | Set speed to 16.8Kbps. |
|--------------+---------------------------------------------|
| \T11 | Set speed to 19.2Kbps. |
|--------------+---------------------------------------------|
| \T12 | Set speed to 21.6Kbps. |
|--------------+---------------------------------------------|
| \T13 | Set speed to 24Kbps. |
|--------------+---------------------------------------------|
| \T14 | Set speed to 26.4Kbps. |
|--------------+---------------------------------------------|
| \T15 | Set speed to 28.8Kbps. |
|--------------+---------------------------------------------|
| \T16 | Set speed to 38.4Kbps. |
|--------------+---------------------------------------------|
| \T17 | Set speed to 57.6Kbps. |
|--------------+---------------------------------------------|
| \T18 | Set speed to 76.8Kbps. |
|--------------+---------------------------------------------|
| \T19 | Set speed to 115.2Kbps. |
|--------------+---------------------------------------------|
| \T20 | Set speed to 128Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCAL SERIAL PORT SPEED - CONNECT MESSAGES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Rn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the speed at which the modem will send |
| | CONNECT messages. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %R0 | Auto-detect current serial port speed. |
|--------------+---------------------------------------------|
| í %R1 | Send messages at speed of last AT command. |
|--------------+---------------------------------------------|
| %R2 | Send messages at 300bps. |
|--------------+---------------------------------------------|
| %R3 | Send messages at 1200bps. |
|--------------+---------------------------------------------|
| %R4 | Send messages at 2400bps. |
|--------------+---------------------------------------------|
| %R5 | Send messages at 4800bps. |
|--------------+---------------------------------------------|
| %R6 | Send messages at 7200bps. |
|--------------+---------------------------------------------|
| %R7 | Send messages at 9600bps. |
|--------------+---------------------------------------------|
| %R8 | Send messages at 12Kbps. |
|--------------+---------------------------------------------|
| %R9 | Send messages at 14.4Kbps. |
|--------------+---------------------------------------------|
| %R10 | Send messages at 16.8Kbps. |
|--------------+---------------------------------------------|
| %R11 | Send messages at 19.2Kbps. |
|--------------+---------------------------------------------|
| %R12 | Send messages at 21.6Kbps. |
|--------------+---------------------------------------------|
| %R13 | Send messages at 24Kbps. |
|--------------+---------------------------------------------|
| %R14 | Send messages at 26.4Kbps. |
|--------------+---------------------------------------------|
| %R15 | Send messages at 28.8Kbps. |
|--------------+---------------------------------------------|
| %R16 | Send messages at 38.4Kbps. |
|--------------+---------------------------------------------|
| %R17 | Send messages at 57.6Kbps. |
|--------------+---------------------------------------------|
| %R18 | Send messages at 76.8Kbps. |
|--------------+---------------------------------------------|
| %R19 | Send messages at 115.2Kbps. |
|--------------+---------------------------------------------|
| %R20 | Send messages at 128Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| OVERSPEED CORRECTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \An [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the amount of overspeed correction |
| | the modem will use. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \A0 | Select 1.25% overspeed correction. |
|--------------+---------------------------------------------|
| \A1 | Select 2.5% overspeed correction. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PROTOCOL/SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Hn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the protocol and speed the modem |
| | will attempt to connect at |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &H0 | Auto-detect fastest common protocol. |
|--------------+---------------------------------------------|
| &H1 | Select V.34 only. |
|--------------+---------------------------------------------|
| &H2 | Select V.32bis or below. |
|--------------+---------------------------------------------|
| &H3 | Select V.32bis only. |
|--------------+---------------------------------------------|
| &H4 | Select V.32 or below. |
|--------------+---------------------------------------------|
| &H5 | Select V.32 only. |
|--------------+---------------------------------------------|
| &H6 | Select V.22bis or below. |
|--------------+---------------------------------------------|
| &H7 | Select V.22 only. |
|--------------+---------------------------------------------|
| &H8 | Select Bell 212A only. |
|--------------+---------------------------------------------|
| &H9 | Select Bell 103A only. |
|--------------+---------------------------------------------|
| &H10 | Select V.21 only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RETRAIN MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the modem's reaction to a poor |
| | quality connection. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %Q0 | Modem will not retrain. |
|--------------+---------------------------------------------|
| %Q1 | Modem will retrain up to three times, then |
| | it will disconnect if line quality is still |
| | to poor to support connection. |
|--------------+---------------------------------------------|
| %Q2 | Modem will retrain until line quality is |
| | good enough to support connection. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RETRANSMISSION MAXIMUM |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S70=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the maximum number of times that the |
| | modem will retransmit a packet due to |
| | errors before the modem will hang up. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RTS SIGNAL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Rn [cmds] |
|--------------+---------------------------------------------|
| Description: | |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &R0 | RTS normal in asynchronous connect mode and |
| | forced high in asynchronous command mode. |
| | In synchronous mode, RTS follows CTS with |
| | delay set by S26 command. |
|--------------+---------------------------------------------|
| í &R1 | RTS normal in connect mode, forced high in |
| | asynchronous command mode. |
|--------------+---------------------------------------------|
| &R2 | RTS normal. |
|--------------+---------------------------------------------|
| &R3 | RTS forced high. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRELLIS CODING |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Un [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the modem will use trellis |
| | coding. |
|------------------------------------------------------------|
| Command | Function |
|-----------------------+------------------------------------|
| í &U0 | Trellis coding enabled. |
|-----------------------+------------------------------------|
| &U1 | Trellis coding disabled. |
+------------------------------------------------------------+