Card Type	Modem (asynchronous)
Chipset	Unidentified
I/O Options	Voice, speakerphone, DVSD, speaker out, microphone in
Maximum Data Rate	33.6Kbps
Maximum Fax Rate	14.4Kbps
Data Modulation	Bell 103A, 212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34
Fax Modulation	ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression	MNP5, V.42, V.42bis
Fax Class	Class I
Data Bus	16-bit ISA
Card Size	Full height, half length

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

SERIAL PORT ADDRESS SELECTION
Setting	JP1/A	JP1/B
3F8h (COM1:)	Closed	Closed
2F8h (COM2:)	Open	Closed
3E8h (COM3:)	Closed	Open
2E8h (COM4:)	Open	Open

INTERRUPT SELECTION
Setting	JP1/C	JP1/D	JP1/E	JP1/F
3	Closed	Open	Open	Open
4	Open	Closed	Open	Open
5	Open	Open	Closed	Open
7	Open	Open	Open	Closed

SUPPORTED STANDARD COMMANDS

Basic AT Commands

+++, ‘comma’, A/

A, B, D, E, H, L, M, N, O, P, Q, T, V, W, X, Y, Z

&C, &D, &F, &G, &K, &P, &R, &S, &T, &V, &W, &Y, &Z

Extended AT Commands

\A, \N

%C, %E, %L, %Q

Special AT Commands

:E, +MS

S-Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S24, S25, S26, S29, S30, S32, S33

S36, S38, S46, S48, S86, S91, S92, S95

Note: See MHI help file for complete information.

UNIDENTIFIED COMMANDS
Command	Default
S28	Unidentified
S37	Unidentified
S41	Unidentified

DISPLAY CHIPSET MANUFACTURER
Type:	Immediate
Format:	AT [cmds] #MFR? [cmds]
Description:	Displays the voice chipset manufacturer’s name.

DISPLAY CHIPSET MODEL NAME
Type:	Immediate
Format:	AT [cmds] #MDL? [cmds]
Description:	Displays the model name of the modem's voice chipset.

DISPLAY CHIPSET REVISION
Type:	Immediate
Format:	AT [cmds] #REV? [cmds]
Description:	Displays the revision level of the modem's voice chipset.

DISPLAY PRODUCT INFORMATION
Type:	Immediate
Format:	AT [cmds] J [cmds]
Description:	Displays information about the modem.

MODE SELECTION
Type:	Immediate
Format:	AT [cmds] #CLS=n [cmds]
Description:	Selects which mode the modem will operate in.
Command	Function
#CLS=0	Modem will operate in data mode.
#CLS=1	Modem will operate in fax class 1 mode.
#CLS=8	Modem will operate in voice mode.

TONE DETECTION
Format:			AT [cmds] #VTD=x,y,z [cmds]
Default:			x,y,z 63
Range:			0 - 63
Description:			Sets which tones the tone detection will report.
Note:			The value of x sets the tone detection modes in voice transmit mode, y sets them in voice receive mode, and z sets them in voice command mode.
Bit	Value			Function
0	0 í 1			DTMF tones are not detected. DTMF tones are detected.
1		0 í 1			V.25 1300Hz calling tone is not detected. V.25 1300Hz calling tone is detected.
2		0 í 1			T.30 1100Hz fax tone is not detected. T.30 1100Hz fax tone is detected.
3		0 í 1			V.25/T.30 2100Hz answer tone is not detected. V.25/T.30 2100Hz answer tone is detected.
4		0 í 1			Bell 2225Hz answer tone is not detected. Bell 2225Hz answer tone is detected.
5		0 í 1			Call progress tones are not detected. Call progress tones are detected.

TONE GENERATOR - DIRECT ENTRY
Type:	Immediate
Format:	AT [cmds] #VTS=[m, n, x]
Range:	m 200-3000, n 200-3000, x 0-255
Unit:	m 1 Hz, n 1 Hz, x .1 second
Description:	Generates a dual-frequency tone for duration x at frequencies m and n.

TONE GENERATOR - TIMED PHONE KEYS
Type:	Immediate
Format:	AT [cmds] #VTS={a, n}
Range:	a 0-9, A-D, #, *; x 0-255
Unit:	x .1 second
Description:	Generates the DTMF tone for duration x for the character a.

TONE GENERATOR - PHONE KEYS
Type:	Immediate
Format:	AT [cmds] #VTS=a
Range:	0-9, A-D, #, *
Description:	Generates the DTMF tones for the characters in the string for the duration set with +VBT.

TONE GENERATOR LENGTH
Format	AT [cmds] #VBT=n [cmds]
Default:	10
Range:	0 - 40
Unit:	0.1 second
Description:	Sets the length of DTMF tones that are generated.

VOICE BUFFER SPACE
Type:	Configuration
Format:	AT [cmds] #VSK=n [cmds]
Default:	255
Range:	0 - 255
Unit:	1 byte
Description:	Sets the amount of data the modem can send into the buffer after the XOFF signal is sent.

VOICE DEVICE
Type:	Configuration
Format:	AT [cmds] #VLS=n [cmds]
Description:	Selects the I/O device for the DSP chip.
Note:	This modem may not support all options listed below. The #VLS? command will display the available options.
Command	Function
í #VLS=0	Telephone line and handset used for voice I/O.
#VLS=1	Telephone handset used for voice I/O.
#VLS=2	Internal speaker only used for voice I/O.
#VLS=3	External microphone only used for voice I/O.
#VLS=4	Telephone line and handset used for voice I/O; internal speaker enabled.
#VLS=5	Headset used for voice I/O.
#VLS=6	Speakerphone used for voice I/O.
#VLS=7	Handset muted by disconnecting handset or speakerphone from telephone line.
#VLS=8	Connects caller ID relay for recording of conversation over handset.
#VLS=9	Connects handset (or speakerphone) to DSP chip for recording or playback.

VOICE - DISPLAY BUFFER SIZE
Type:	Immediate
Format:	AT [cmds] #VBQ? [cmds]
Description:	Displays the size of the voice buffer.

VOICE - DISPLAY COMPRESSION TYPE
Type:	Immediate
Format:	AT [cmds] #VCI? [cmds]
Description:	Displays the type of compression currently in use.

VOICE - LOCAL SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] #BDR=n [cmds]
Default:	0
Range:	0 - 48
Unit:	2400bps
Description:	Sets the speed of the local serial port when in voice mode. A value of 0 indicates that the modem should auto-detect the correct serial port speed.

VOICE RE-RING DETECT TIME
Type:	Configuration
Format:	AT [cmds] #VRA=n [cmds]
Default:	70
Range:	0 -255
Unit:	10 mS
Description:	Sets the maximum time the modem will wait for the remote station to ring again before it assumes that it has gone off-hook.

VOICE RECEIVE
Type:	Immediate
Format:	AT [cmds] #VRX
Description:	Commands the modem to begin receiving voice data.

VOICE RING DETECT TIME
Type:	Configuration
Format:	AT [cmds] #VRN=n [cmds]
Default:	70
Range:	0 - 255
Unit:	.1 second
Description:	Sets the maximum time the modem will wait for the remote station to ring before it assumes that it went off-hook before it rang.

VOICE SAMPLE QUALITY
Type:	Configuration
Format:	AT [cmds] #VBS=n [cmds]
Description:	Selects the number of bits per sample that the modem records.
Note:	This modem may not support all options listed below. The #VBS? command will display the available options.
Command	Function
#VBS=2	Modem records 2 bits per sample in ADPCM encoding.
#VBS=3	Modem records 3 bits per sample in ADPCM encoding.
í #VBS=4	Modem records 4 bits per sample in ADPCM encoding.
#VBS=8	Modem records 8 bits per sample in PCM encoding.
#VBS=16	Modem records 16 bits per sample in PCM encoding.

VOICE SAMPLING RATE
Type:	Configuration
Format:	AT [cmds] #VSR=n [cmds]
Description:	Sets the sampling rate used when recording voice signals.
Command	Function
í #VSR=7200	Selects a sampling rate of 7.2KHz.
#VSR=8000	Selects a sampling rate of 8KHz.
#VSR=11025	Selects a sampling rate of 11.025KHz in PCM encoding only.

VOICE SILENCE DETECTION
Type:	Configuration
Format:	AT [cmds] #VSD=n [cmds]
Description:	Selects whether the modem will use silence detection to pause recording during periods of silence.
Command	Function
í #VSD=0	Silence detection disabled.
#VSD=1	Silence detection enabled.

VOICE SILENCE DETECTION TIME
Type:	Configuration
Format:	AT [cmds] #VSP=n [cmds]
Default:	55
Range:	0 - 255
Unit:	.1 second
Description:	Sets the minimum amount of silence that the modem will detect.

VOICE SILENCE DETECTION THRESHOLD
Type:	Configuration
Format:	AT [cmds] #VSS=n [cmds]
Description:	Sets the threshold of sensitivity that the modem uses to determine silence detection.
Command	Function
#VSS=0	Silence detection disabled.
#VSS=1	Minimum silence detection sensitivity.
#VSS=2	Standard silence detection sensitivity.
#VSS=3	Maximum silence detection sensitivity.

VOICE TIMING MARK
Type:	Configuration
Format:	AT [cmds] #VTM=n [cmds]
Description:	Configures timing mark placement.
Command		Function
#VTM=0		Timing marks disabled.
#VTM=1		Timing marks enabled.

VOICE TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] #TL=hhhh [cmds]
Default:	3FFF
Range:	0000 - 7FFF
Unit:	Unidentified (hexadecimal)
Description:	Sets the transmission level for sending audio in voice mode.

VOICE TRANSMIT
Type:	Immediate
Format:	AT [cmds] #VTX
Description:	Commands the modem to begin transmitting voice data.