Card Type	Fax, Modem (synchronous/asynchronous)
Chip Set	Unidentified
Maximum Data Rate	14.4Kbps
Maximum Fax Rate	14.4Kbps
Data Bus	External
Fax Class	Class I
Data Modulation Protocol	Bell 103/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis
Fax Modulation Protocol	ITU-T V.17, V.27ter, V.29
Error Correction/Compression	MNP5, MNP10, V.42, V.42bis

CONNECTIONS
Function	Label		Function		Label
Auxiliary port		CN1		DC power		CN4
Line out		CN2		Power switch		SW1
RS-232/422		CN3

USER CONFIGURABLE SETTINGS
Setting	Label	Position
í DTR signal ignored	SW1/1	On
DTR signal normal	SW1/1	Off
í DCD and DSR forced high	SW1/2	On
DCD and DSR normal	SW1/2	Off
í Echo disabled	SW1/3	On
Echo enabled	SW1/3	Off
í Result codes disabled	SW1/4	On
Result codes enabled	SW1/4	Off
í Leased-line operation	SW1/5	On
Switched line operation	SW1/5	Off
í Auto-answer enabled on 2nd ring	SW1/6	On
Auto-answer disabled on 2nd ring	SW1/6	Off
í Synchronous mode 2 enabled	SW1/7	On
Synchronous mode 2 disabled	SW1/7	Off
í Dumb mode	SW1/8	On
Smart mode	SW1/8	Off
í Flow control to XON/XOFF enabled	SW2/1	On
Flow control to XON/XOFF disabled	SW2/1	Off
í V.25bis command set synchronous HDLC (NRZI) enabled	SW2/2	On
V.25bis command set synchronous HDLC (NRZI) disabled	SW2/2	Off
í Factory configured - DO NOT ALTER	SW2/5	Unidentified
í Factory configured - DO NOT ALTER	SW2/6	Unidentified
í Factory configured - DO NOT ALTER	SW2/7	Unidentified
í Factory defaults loaded up on power-up	SW2/8	On
Do no force factory defaults on power-up	SW2/8	Off
í Factory configured - DO NOT ALTER	LK2	Unidentified

AUXILIARY PORT
Setting	LK1	LK3	LK4	LK5	LK6	LK7	LK8
í PSTN	Pins 2 & 3 closed	Closed	Closed	Closed	Open	Closed	Open
Leased line	Pins 1 & 2 closed	Open	Closed	Open	Closed	Closed	Closed

MODULATION SELECTION
Setting	SW2/3	SW2/4
factory/stored setting	Off	Off
14400 carrier	Off	On
9600 carrier	On	Off
2400 carrier	On	On

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘Comma’

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

&C, &D, &G, &L, &R, &S, &V, &W, &X, &Y, &Z

Extended AT Commands

\B, \G, \J, \V, \Y, \Z

Special Commands

*H, )M

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S14, S16, S18, S21, S22, S25, S26, S36

S37, S38

Note: See MHI Help file for full command documentation.

ACKNOWLEDGMENT TIMER (T401)
Type:	Configuration
Format:	AT [cmds] %Wn [cmds]
Default:	Unidentified
Range:	0-63
Unit:	Unidentified
Description:	Wait to retransmit time out
Note:	T401 = 4 seconds + n x 100ms. Exception when in MNP mode: If n=0 use Microcom timers. If n=63 use ITU-T V42 Annex A timers.

ANSWER LOGON SEQUENCE
Type:	Register
Format:	AT [cmds] S34=n [cmds]
Default:	0
Range:	0, 128-137
Unit:	Unidentified
Description:	Controls answer logon sequence
Note:	If ATS34=0, then no logon in answer mode

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Configuration
Format:	AT [cmds] S46=n [cmds]
Default:	13
Range:	0-127
Unit:	ASCII
Description:	Sets the character used as the auto-reliable fallback character; %A0 will disable this function.

AUTO-RETRAIN
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Description:	Controls auto-retrain mode
Command	Function
&E0	Auto-retrain disabled
í &E1	Auto-retrain enabled

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Default:		Unidentified
Range:		0-189
Unit:		Bit-mapped
Description:		Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone.
Bit	Value	Function
0	0 í 1	Remote digital loopback denied Remote digital loopback allowed
3 - 1	000 001 010 011 100 101 110 111	Sets serial port speed to 0-300bps Sets serial port speed to 600bps Sets serial port speed to 1200bps Sets serial port speed to 2400bps Sets serial port speed to 4800bps Sets serial port speed to 9600bps Sets serial port speed to 19200bps Sets serial port speed to 38400bps
5, 4	00 01 10 11	Parity even Space Parity Parity odd Mark or No Parity
7, 6	00 01 10	Guard tone disabled Guard tone 550Hz enabled Guard tone 1800Hz enabled

BIT-MAPPED REGISTER S24
Format:			AT [cmds] S24=n [cmds]
Default:			143
Range:			0-255
Description:			Controls error control fallback character, error control buffer, data compression, auto-mode detection, extended result code, and lock serial port speed.
Bit	Value			Function
0		0 í 1			No fallback character Enable fallback character in S46
1		0 í 1			Do not buffer data Buffer data
2		0 í 1			Data compression disabled Data compression enabled
4, 3		00 í 01 10			S37 speed Optimum speed up to DTE if ATS37=255 Optimum speed if ATS37=255, except V.34 is disabled
6, 5		í 00 01 10			Extended result codes enabled Hayes extended result codes enabled Microcom extended result codes enabled
7		0 í 1			Serial speed locked Serial speed follows connect speed

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Default:		10
Range:		0-111
Unit:		Bit-mapped
Description:		Selects synchronous/asynchronous mode, line type, clock source, and ITU-T/Bell modes.
Bit	Value	Function
3, 1, 0	000 001 010 011 100 101 í 110 111	Asynchronous direct mode enabled Synchronous mode 1 Synchronous mode 2 Synchronous mode 3 Direct mode Error correction mode V.42/MNP error correction mode V.42 error correction mode only
2	í 0 1	Switched line Leased line
5, 4	í 00 01 10	Local modem generates transmit clock source Local DTE generates transmit clock source Remote DCE/DTE generates transmit clock source
6	í 0 1	ITU/T mode Bell mode

BIT-MAPPED REGISTER S28
Format:			AT [cmds] S28=n [cmds]
Default:			8
Range:			0-255
Description:			Controls maximum block size, V.42 detection period (T4ØØ) in 5Ø milliseconds increments, and ODP/ADP
Bit	Value			Function
1, 0		00 01 10 í 11			64 bytes 128 bytes 192 bytes 256 bytes
6 - 2		00000 ….to…. í 10000 ….to…. 11111			Infinite time for detection ….to…. .8 seconds ….to…. 7.75 seconds
7		0 í 1			Disable ODP/ADP when initiating a reliable V.42 handshake Enable ODP/ADP when initiating a reliable V.42 handshake

BIT-MAPPED REGISTER S29
Format:			AT [cmds] S29=n [cmds]
Default:			0
Range:			0-255
Description:			Controls V.42 acknowledgment timer (T4Ø1), V.42 frame check sequence, and V.42 selective reject
Bit	Value			Function
5 - 0		í 000000 000001 .…to…. 111111			4 seconds 4.1 ….to…. 10.3 seconds
6		í 0 1			Always use CRC-16 Attempt use if CRC-32
7		í 0 1			Disable V.42 selective reject Enable V.42 selective reject

BIT-MAPPED REGISTER S30
Format:			AT [cmds] S30=n [cmds]
Default:			15
Range:			0-255
Description:			Controls V.42 windows size Negative ADP, asynchronous MNP2, and remote loopback test
Bit	Value			Function
4 - 0	00000 00001 .…to…. í 01111 .…to…. 11111			Not used 1 packet ….to…. 15 packets .…to…. 31 packets
5		í 0 1			Disable negative ADP Enable negative ADP
6		í 0 1			Do not force asynchronous MNP2 Force asynchronous MNP2
7		í 0 1			Ignore loopback frame received from remote Process loopback frame received from remote

BIT-MAPPED REGISTER S31
Format:			AT [cmds] S31=n [cmds]
Default:			0
Range:			0-159
Description:			Controls V.25 bis selection, synchronous mode V.13, abort, DTE Autobauding, and V.25 bis mode.
Bit	Value			Function
1, 0	í 00 01 10 11			Asynchronous V.25 Bisync V.25 bis NRZ HDLC V.25 bis NRZ HDLC V.25 bis NRZI
2		í 0 1			Disable Synchronous mode V.13 Enable Synchronous mode V.13
3		í 0 1			Ignore keyboard abort on answer disabled Ignore keyboard abort on answer enabled
4		í 0 1			Enable DTE Autobauding Disable DTE Autobauding
6, 5		í 00			Not used
7		í 0 1			AT commands enabled V.25bis enabled as per bits 1,Ø

BIT-MAPPED REGISTER S32
Format:			AT [cmds] S32=n [cmds]
Default:			0
Range:			0-255
Description:			Controls encryption mode, MNP extended services, power level adjustment, MNP10 - link negotiation, and MNP1Ø selection.
Bit	Value			Function
1, 0	í 00 01 10 11			No encryption Force V.42bis encryption Not used Not used
3, 2		í 00 01 10			MNP Extended Services disabled MNP Extended Services enabled MNP Extended Services enabled without MNP indication during the answer detect phase
4		í 0 1			Power level adjustment disabled Power level adjustment enabled
6, 5		í 00 01 10			Link will be negotiated at highest possible speed Link will be negotiated at 1200bps Link will be negotiated at 4800bps
7		í 0 1			MNP10 enabled MNP10 disabled

BIT-MAPPED REGISTER S39
Format:			AT [cmds] S39=n [cmds]
Default:			128
Range:			0-252
Description:			Controls, DTE rate at 230.4Kbps, DTE rate at 115.2Kbps, break handling, EIA loopback test, and auto retrain
Bit	Value			Function
1, 0		í 00			Not used
2		í 0 1			DTE rate is according to bits 1-3 of S23 or bit 3 of S39 DTE rate fixed at 23Ø4ØØ bps
3		í 0 1			DTE rate is according to bits 1-3 of S23 or bit 2 of S39 DTE rate fixed at 1152ØØ bps
5, 4		í 00 10 11			Break sent in sequence with received data Break sent immediately to DTE Buffers cleared, break sent to DTE
6		í 0 1			Disabled EIA loopback test Enabled EIA loopback test
7		0 í 1			Auto retrain disabled Auto retrain enabled

BIT-MAPPED REGISTER S49
Format:			AT [cmds] S49=n [cmds]
Default:			Unidentified
Range:			0-255
Description:			Controls flow control, compromise equalizer value, smart/dumb mode, and, compromise equalizer.
Bit	Value			Function
4 - 0	00000 í 00011 00100 01000 01100 10000 10100			Flow control disabled Hardware flow control DCE to DTE, bi-directional flow control DCE to DTE, unidirectional flow control DCE to DTE, bi-directional, transparent flow control DCE to remote modem, bi-directional flow control DTE to DCE to remote modem bi-directional flow control
5		0 1			3 dB when compromise equalizer enabled 6 dB when compromise equalizer enabled
6		í 0 1			Smart mode Dumb mode
7		í 0 1			Compromise equalizer enabled Compromise equalizer disabled

BREAK MODE
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Description:	Controls how the modem handles break conditions on the DTE interface
Command		Function
í &IØ		Break sent in sequence with received data
&I1		Break sent immediately to DTE
&I2		Buffers cleared, break sent to DTE

BREAK TYPE
Type:		Configuration
Format:		AT [cmds] \Kn [cmds]
Description:		Configures action of break signal
Command	Break from DTE
\K0	Online command mode enabled, send no break to remote modem
\K1	Break sent to remote modem and buffers cleared
\K2	Online command mode enabled, send no break to remote modem
\K3	Send break to remote modem immediately
\K4	Online command mode enabled, send no break to remote modem
í \K5	Send break with transmitted data

BUFFERED DATA ON HANG-UP
Type:		Configuration
Format:		AT [cmds] %Dn [cmds]
Default:		Unidentified
Range:		0-255
Unit:		1 second
Description:		Wait for receive buffer to be sent to DTE before hanging up
Command	Function
%DØ	Hang up without clearing buffer

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Qn [cmds]
Description:	Selects communications mode options
Command	Mode
&Q0	Asynchronous mode enabled
&Q1	Synchronous mode 1 enabled
&Q2	Synchronous mode 2 enabled
&Q3	Synchronous mode 3 enabled
&Q4	Asynchronous direct mode
&Q5	MNP Error correction mode
í &Q6	V.42/MNP error correction mode
&Q7	V.42 error correction mode only

CONNECT MODE
Type:	Configuration
Format:	AT [cmds] \Nn [cmds]
Description:	Controls the type of connection the modem will operate in
Command	Function
\N0	Normal mode enabled
\N1	Direct mode enabled
\N2	MNP reliable mode enabled
\N3	Auto-reliable mode enabled
\N4	V.42 reliable mode enabled
\N5	MNP auto-reliable mode enabled
\N6	Reliable mode enabled
í \N7	Auto-reliable mode enabled

DIAL
Type:	Immediate
Format:	AT [cmds] D<#> [cmds]
Description:	Dials telephone number according to any modifiers included in the string
Note:	Any combination of modifiers can be used to produce the desired dial functions in sequence.
Modifier	Function
J	Link will be negotiated at 1200bps, AT*H1 command
K	Power level adjustment enabled, AT)M1 command
P	Pulse dialing enabled
S=n	Dial stored telephone number n
T	Tone dialing enabled/Pulse dialing disabled
,	Dialing paused for amount of time specified in S8 register

DIAL ATTEMPTS
Type:	Register
Format:	AT [cmds] S41=n [cmds]
Default:	0
Range:	0-10
Unit:	1 attempt
Description:	Controls the number of time the modem will redial

DTE AUTOBAUDING
Type:	Configuration
Format:	AT [cmds] %Bn [cmds]
Description:	When AT%B1 is set, the modem will only respond to commands at the same port (DTE) speed
Note:	This command can be used to lock the port speed, see AT\J in the MHI Help file.
Command		Function
%B0		DTE autobauding enabled
í %B1		DTE autobauding disabled

DTE SPEED - DATA MODE
Type:	Configuration
Format:	AT [cmds] &Bn [cmds]
Description:	Controls DTE speed during data mode
Command		Function
&B0		DTE speed follows connect speed
í &B1		DTE speed equals last AT command speed or the default value on power up

ERROR CONTROL BUFFER
Type:	Configuration
Format:	AT [cmds] &On [cmds]
Description:	Controls how buffering is performed during the error control negotiation period
Note:	This command affects how data received is processed by the DCE
Command		Function
&O0		Discard data received during negotiation
í &O1		Buffer data received during negotiation. Data will be sent to the DTE after the connect result code, if error control negotiation fails.

ERROR CORRECTION
Type:	Read-only
Format:	AT [cmds] S44? [cmds]
Description:	Displays which error correction method is in use
Value		Meaning
0		Error correction disabled
2		MNP class 2 enabled
3		MNP class 3 enabled
4		MNP class 4 enabled
5		MNP class 5 enabled
6		V.42 enabled
7		V.42bis enabled

FACTORY DEFAULT PROFILE
Type:	Configuration
Format:	AT [cmds] &F [cmds]
Description:	Sets values in active profile to values found in the default profile
Command		Function
&FØ		V.42 factory defaults
&F1		MNP factory defaults
&F2		Basic asynchronous operation defaults

FLASH MEMORY DOWNLOAD
Type:	Immediate
Format:	AT [cmds] %FLOAD [cmds]
Description:	Retrieve upgrade code to modem through serial port

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Enables flow control options
Command	Function
&K0	Flow control disabled
í &K3	Local RTS/CTS flow control enabled
&K4	Local XON/XOFF flow control enabled
&K8	Unidirectional Software flow control enabled
&K12	Software flow control - XON/XOFF enabled
&K16	Software - Internal XON/XOFF flow control enabled
&K20	Software - Local XON/XOFF flow control enabled

FLOW CONTROL CHARACTER - XOFF
Type:	Register
Format:	AT [cmds] S48=n [cmds]
Default:	19
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XOFF

FLOW CONTROL CHARACTER - XON
Type:	Register
Format:	AT [cmds] S47=n [cmds]
Default:	17
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XON

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] S40=n [cmds]
Default:	0
Range:	0-255
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects; S90=0 will disable.

INGORE KEYBOARD ABORT DURING ANSWER MODE
Type:	Configuration
Format:	AT [cmds] %Qn [cmds]
Description:	Controls the modem to ignore any data sent to the modem while it is in answer mode
Command	Function
í %Q0	Keyboard abort disabled
%Q1	Keyboard abort enabled

LINE SIGNAL LEVEL
Type:	Immediate
Format:	AT [cmds] %Ln [cmds]
Description:	Returns a value which indicates the received line signal level
Command		Function
%L0		Reports signal level in dB
%L1		Reports data pump line status

REDIAL ATTEMPTS ON LINE LOSS
Type:	Configuration
Format:	AT [cmds] {An [cmds]
Default:	Unidentified
Range:	0-3
Unit:	1 attempt
Description:	Number of attempts to attempt to reconnect if line drops by 1 minute intervals
Note:	ATS15=0 - No re-dial

REDIAL ATTEMPTS ON LINE LOSS
Type:	Register
Format:	AT [cmds] S15=n [cmds]
Default:	Unidentified
Range:	0-3
Unit:	1 attempt
Description:	Number of attempts to attempt to reconnect if line drops by 1 minute intervals
Note:	If the re-dial is aborted by a key-press then no further re-dials are attempted.

REASON FOR DISCONNECTION
Type:	Read-only
Format:	AT [cmds] S45? [cmds]
Description:	Displays why the modem disconnected from the link
Value		Meaning
0		Lost carrier
1		User interrupt
2		Training failure
3		Retrain failure
4		Inactivity time out
5		Long space disconnect
6		Negotiation failure

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports product code
I1	Reports ROM checksum. The report is displayed as three hexadecimal digits.
I2	Tests and reports ROM checksum, returns ‘OK’ or ‘ERROR’
I3	Reports firmware revision number
I4	Reports ASCII string test
I5	Reports data pump chipset revision

SMART/DUMB MODE
Type:	Configuration
Format:	AT [cmds] *Dn [cmds]
Description:	Select between smart mode and dumb mode
Command		Function
í *D0		Smart mode enabled
*D1		Dumb mode enabled

TRANSMISSION LEVEL
Type:	Register
Format:	AT [cmds] S35=n [cmds]
Default:	10
Range:	0-20
Unit:	-1 dBm
Description:	Sets the signal level for transmission

TRANSMISSION LEVEL - CELLULAR
Type:	Register
Format:	AT [cmds] S33=n [cmds]
Default:	9
Range:	0-20
Unit:	-1 dBm
Description:	Sets the signal level for transmission while in cellular mode

V.25bis SELECTION
Type:	Configuration
Format:	AT [cmds] %Vn [cmds]
Description:	Sets the V.25bis speed as per S23 bits 3, 2, 1 and S39 bits 3,2
Command		Function
í %VØ		AT command set
%V1		V.25bis command set asynchronous
%V2		V.25bis command set synchronous BSC
%V3		V.25bis command set synchronous HDLC (NRZ)
%V4		V.25bis command set synchronous HDLC (NRZI)