28IDSSA, 28ISSA modem/telephone/ISDN Settings and Configuration

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 Correction/Compression	MNP5, V.42, V.42bis
Fax Class	Class I & II
Data Bus	16-bit ISA
Card Size	Full height, half length

CONNECTIONS
Function	Label	Function	Label
Telephone line	CN1	Microphone in or speaker out	CN3
Telephone line	CN2	Microphone in or speaker out	CN4
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

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.