Card Type	Modem (asynchronous)
Chip Set	Unidentified
Maximum Modem Rate	14.4Kbps
Maximum Fax Rate	14.4Kbps
Data Modulation Protocol	Bell 103/212A ITU-T V.21, V.22, V.22bis, V.32, V.32bis
Fax Modulation Protocol	ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression	MNP5, V.42, V.42bis
Fax Class Data Bus	Class I & II External

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
AA	Unidentified	On	Auto-answer enabled
AA	Unidentified	Off	Auto-answer disabled
AA	Unidentified	Blinking	Phone is ringing
RX	Unidentified	On	Modem is receiving data
RX	Unidentified	Off	Modem is not receiving data
TX	Unidentified	On	Modem is transmitting data
TX	Unidentified	Off	Modem is not transmitting data
CD	Unidentified	On	Carrier signal detected
CD	Unidentified	Off	Carrier signal not detected
OH	Unidentified	On	Modem is off-hook
OH	Unidentified	Off	Modem is on-hook
RS	Unidentified	On	Modem is ready to send data
RS	Unidentified	Off	Modem is not ready to send data
TR	Unidentified	On	DTR signal is high
TR	Unidentified	Off	DTR signal is low
EC	Unidentified	On	Error correction enabled
EC	Unidentified	Off	Error correction disabled
CS	Unidentified	On	Modem is clear to send data
CS	Unidentified	Off	Modem is not clear to send data
MR	Unidentified	On	Power is on
MR	Unidentified	Off	Power is off

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, A/

A, D, E, H, M, V, W, X, Y, Z

&A, &B, &F, &L, &R, &S, &T, &V, &W, &Y, &Z

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S25, S26, S30, S36, S37, S38, S46,

S48, S82, S86, S95, S108, S109, S110

Note: See MHI Help File for full command documentation.

AUTO-MODE DETECTION
Type:	Configuration
Format:	AT [cmds] Nn [cmds]
Description:	Selects various options for the automatic detection and negotiation of protocols during the handshake process if the modem is communicating with a remote modem of dissimilar speed.
Command	Function
N0	Auto-mode detection disabled
í N1	In originate mode, handshake begins at line speed designated by the S37 register. Modem can shift to a slower speed if necessary. In answer mode, handshake attempted with the following protocols in order - V.FC, V.32bis, V.32, V.22bis, V.22 or Bell 212, V.21, and Bell 103

CLOCK SOURCE - SYNCHRONOUS TRANSMIT
Type:	Configuration
Format:	AT [cmds] &Xn [cmds]
Description:	Selects DTE transmit clock source
Command	Function
&X2	Modem generates clock from the receive carrier signal

COMMUNICATION PROTOCOLS
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Description:	Selects the communication protocol for data calls
Note: The B command allows the simultaneous selection of more than one suffix, enabling multiple protocols.
Command	Protocol
B0	ITU-T V.22 at 1200bps
B1	Bell 212A at 300 or 1200bps
B2	ITU-T V.23 at 75/1200bps
B3	ITU-T V.23 at 1200/75bps
B15	ITU-T V.21 at 300bps
B16	Bell 103 at 300bps

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects communications mode
Command	Mode
í &M0	Asynchronous mode

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Qn [cmds]
Description:	Selects communications mode options
Command	Mode
í &Q0	Asynchronous mode, serial port speed follows connect speed.
&Q1	Synchronous mode 1
&Q2	Synchronous mode 2
&Q3	Synchronous mode 3
&Q3	Hayes AutoSync mode
&Q5	Error correction mode
&Q6	Buffered asynchronous mode
&Q8	MNP operational mode
&Q9	Conditional data compression

DATA CARRIER DETECT (DCD)
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Description:	Selects whether the DCD option is enabled or disabled
Command	Function
í &C0	DCD enabled
&C1	DCD enabled after carrier signal detected
&C2	DCD signal on except during disconnect

DATA TERMINAL READY (DTR)
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Description:	Selects modem response to DTR
Note: The action each variant of &D causes depends on the setting of &Q
Command	Function
í &D0	Modem does not respond to DTR
&D1	Modem goes to command mode after DTR goes is off
&D2	Modem goes to command mode and disconnects (hangs up) after DTR goes off; Auto-Answer is disabled.
&D3	Modem is initialized after DTR goes off

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Enables flow control options
Command	Function
&K0	Flow control disabled
&K1	RTS to CTS flow control enabled
&K2	XON/XOFF flow control enabled
í &K3	RTS/CTS flow control enabled
&K4	XON/XOFF flow control enabled
&K5	Transparent XON/XOFF flow control enabled
&K6	RTS/CTS flow control with pass through enabled
&K7	RTS/CTS flow control with XON/XOFF DCE to DCE enabled

GUARD TONE
Type:	Configuration
Format:	AT [cmds] &Gn [cmds]
Description:	Commands the modem to transmit a guard tone in V.22/V.22bis
Note: Used primarily for international data transmission
Command	Function
í &G0	Guard tone disabled

HELP
Type:	Immediate
Format:	AT [cmds] $H
Description:	Accesses summary of the modem’s commands

ON-LINE
Type:	Immediate
Format:	AT [cmds] On [cmds]
Description:	Controls on-line command (data transmission) state options.
Note: The O command must be placed at the end of the command string.
Command	Function
O0	On-line command mode with no retraining enabled
O1	On-line command mode with retraining enabled
O2	On-line command mode and initiate rate negotiation

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports modem model and speed
I1	Reports ROM checksum
I2	Perform ROM checksum, returns OK or ERROR
I3	Reports firmware revision number
I4	Reports modem feature availability
I6	Reports link statistics

RESULT CODES
Type:	Configuration
Format:	AT [cmds] Qn [cmds]
Description:	Enables modem to send result codes to the DTE
Command	Function
í Q0	Result code sending enabled
Q1	Result code sending disabled
Q2	Modem returns result codes when originating a call, but does not return result codes from the answer mode.

SPEAKER VOLUME
Type:	Configuration
Format:	AT [cmds] Ln [cmds]
Description:	Controls speaker volume
Command	Function
L0	Low volume setting
L1	Low volume setting
í L2	Medium volume setting
L3	Highest volume setting

TRELLIS CODE MODULATION
Type:	Immediate
Format:	AT [cmds] &U [cmds]
Description:	Controls trellis encoding
Command	Function
&U0	Enables trellis encoding
&U1	Disables trellis encoding

BUFFER LOWER LIMIT
Type:		Register
Format:	AT [cmds] S49=n [cmds]
Range:	1-249
Default:	64
Unit:	bytes
Description:	Sets the lower limit of the buffer

BUFFER UPPER LIMIT
Type:		Register
Format:	AT [cmds] S50=n [cmds]
Range:	2-250
Default:	bytes
Unit:	220
Description:	Sets the upper limit of the buffer

DCE SPEED
Type:	Register
Format	AT [cmds] S43? [cmds]
Description:	Displays the DCE speed of the current connection

PACKET SIZE
Type:	Register
Format	AT [cmds] S136=n [cmds]
Range:	0-2
Unit:	frame size
Description:	Designates the LAP-M packet size

PRIVATE CIRCUIT CARRIER LEVEL
Type:	Register
Format	AT [cmds] S63=n [cmds]
Range:	0-15
Units:	-dBm
Description:	Controls the carrier power level in dBm for leased line operation.

PROBE TIMING
Type:	Register
Format:	AT [cmds] S97=n [cmds]
Range:	15-70
Unit:	0.1 sec
Description:	Sets the duration of the signal used by the modem in answer mode during a V.32 automode handshake to determine if the calling modem is a V.22 or V.22bis type modem

RING SETTINGS
Type:	Register
Format:	AT [cmds] S101=n [cmds]
Range:	0-255
Unit:	bit map
Description:	Sets the distinctive ring setting