Card Type	Fax, Modem (synchronous/asynchronous)
Chip Set	Unidentified
Maximum Data Rate	28.8Kbps
Maximum Fax Rate	14.4Kbps
Data Bus	External
Fax Class	Class I & II
Data Modulation Protocol	ITU-T V.21, V.22, V.22bis, V.32, V.32bis, V.34, V.34bis
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
Line out		CN1		DC power		CN4
Line in		CN2		Power switch		SW1
RS-232/422		CN3

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Red	On	Power is on
PWR	Red	Off	Power is off
OH	Red	On	Modem is off-hook
OH	Red	Off	Modem is on-hook
DTR	Red	On	DTR signal is high
DTR	Red	Off	DTR signal is low
DCD	Red	On	Carrier signal detected
DCD	Red	Off	Carrier signal not detected
CTS	Red	On	Modem ready to receive data
CTS	Red	Off	Modem not ready to receive data
RTS	Red	On	Computer ready to receive data
RTS	Red	Off	Computer not ready to receive data
RXD	Red	On	Modem is receiving data
RXD	Red	Off	Modem is not receiving data
TXD	Red	On	Modem is transmitting data
TXD	Red	Off	Modem is not transmitting data
AA	Red	On	Auto-answer enabled
AA	Red	Off	Auto-answer disabled
TST	Red	On	Modem in test mode
TST	Red	Off	Modem not in test mode

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, ‘Comma’, A/

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

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

Extended AT Commands

\A, \B, \G, \K, \L, %C, %L, %Q

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S14, S16, S18, S21, S22, S24, S25, S26

S29, S30, S31, S32, S33, S36, S37, S38, S39, S46, S48, S82, S86, S91, S92, S95

Special Commands

*H, -K, -Q, )M, @M, :E, +MS

Note: See MHI Help file for full command documentation.

AUTOSYNC™
Format		AT [cmds] S19=n [cmds]
Default:		0
Range:		0-30
Unit:		Bit-mapped
Description:		Sets options for Hayes AutoSync™ functions
Bit	Value	Function
0	í 0	Not used
1	í 0 1	BSC enabled HDLC enabled
2	í 0 1	HDLC address detection disabled HDLC address detection enabled
3	í 0 1	NRZI bit encoding enabled NZI bit encoding enabled
4	í 0 1	Mark idle enabled Flag or sync idle enabled

AUTOSYNC ADDRESS CHARACTER
Type:	Register
Format:	AT [cmds] S20=n [cmds]
Default:	0
Range:	0-255
Unit:	1 byte
Description:	Defines the BSC sync character or the HDLC address

AUTO-RETRAIN - AUTO-FALLBACK/FALL-FORWARD
Type:	Configuration
Format:	AT [cmds] %En [cmds]
Description:	Controls auto-retrain mode and fallback/fall-forward
Command	Function
í %E0	Auto-retrain disabled
%E1	Auto-retrain enabled
%E2	Auto-fallback/fall-forward enabled
%E3	Auto-retrain enabled, hang-up when EQM threshold reached

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Default:		Unidentified
Range:		0-191
Unit:		Bit-mapped
Description:		Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone.
Bit	Value	Function
0	0 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 Not used Parity odd Mark or No Parity
7, 6	00 01 10	Guard tone disabled Not used Guard tone 1800Hz enabled

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Default:		9
Range:		0-127
Unit:		Bit-mapped
Description:		Selects asynchronous mode, line type, clock source, and ITU-T/Bell modes.
Bit	Value	Function
3, 1, 0	000 001 010 011 100 í 101 110 111	Asynchronous mode, serial port speed follows connect speed Not used Not used Not used Not used Error correction mode Buffered asynchronous mode Not used
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:		0-154
Unit:		Bit-mapped
Description:		Controls transmit/receive speed, pulse dialing, and MNP link negotiation.
Bit	Value	Function
0	í 0	Not used
1	í 0 1	75bps transmit, 1200bps receive enabled 1200bps transmit, 75bps receive enabled
2	í 0	Not used
4, 3	00 í 01 10 11	39ms make/61ms break at 10pps 33ms make/67ms break at 10pps 39ms make/61ms break at 20pps 33ms make/67ms break at 20pps
5	í 0	Not used
7, 6	í 00 01 10	Link will be negotiated at highest possible speed Link will be negotiated at 1200bps Link will be negotiated at 4800bps

BIT-MAPPED REGISTER S40
Format		AT [cmds] S40=n [cmds]
Default:		105
Range:		0-255
Unit:		Bit-mapped
Description:		Controls power level and break handling; selects MNP extended services, and block size.
Bit	Value	Function
1, 0	00 01 í 10	MNP extended services disabled MNP extended services enabled MNP extended services enabled without indicating MNP on the answer detection phase.
2	í 0 1	Power level adjustment enabled Power level adjustment disabled
5, 4, 3	000 001 í 010 011 100 101	\K0 \K1 \K2 \K3 \K4 \K5
7, 6	00 01 10 í 11	MNP block size is 64 characters MNP block size is 128 characters MNP block size is 192 characters MNP block size is 256 characters

BIT-MAPPED REGISTER S41
Format		AT [cmds] S41=n [cmds]
Default:		131
Range:		0-219
Unit:		Bit-mapped
Description:		Selects compression, auto-retrain/auto-fallback/fall-forward, flow control, MNP mode and V.22/22bis fallback.
Bit	Value	Function
1 - 0	00 01 10 í 11	Data compression disabled MNP5 enabled V.42bis enabled MNP5 and V.42bis enabled
6, 2	í 00 01 10	Auto-retrain disabled Auto-retrain enabled Auto-fallback/fall-forward enabled
3	í 0 1	Flow control disabled Flow control enabled
4	í 0 1	Stream mode for MNP Block mode for MNP
5	í 0	Not used
7	0 í 1	MNP at 2400 and 1200bps disabled MNP at 2400 and 1200bps enabled

BIT-MAPPED REGISTER S201
Format:			AT [cmds] S201=n [cmds]
Default:			58
Range:			0-62
Description:			Controls power level and compromise equalizer
Bit	Value			Function
4 - 0	í 00000 00001 00010 ... 01010 01011 ...to... 11111			Initial power level -26dBm Initial power level -30dBm Initial power level -10dBm ... Initial power level -10dBm Initial power level -11dBm ...to... Initial power level -31dBm
5		0 í 1			Equalizer disabled Equalizer enabled

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

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects communications mode
Command	Mode
í &M0	Asynchronous mode
&M1	Not used
&M2	Not used
&M3	Not used

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	Not used
&Q2	Not used
&Q3	Not used
&Q4	Not used
&Q5	Error correction mode
&Q6	Buffered asynchronous mode

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	MNP10 link negotiation enabled
K	Power level adjustment enabled during MNP10
L	Re-dial last number
P	Pulse dialing enabled
R	Accepted, but not acted upon
T	Tone dialing enabled
W	Dialing resumed following dial tone detection
$	Waits for prompt tone for amount of time specified by the S7 register.
;	Modem returned to command state after dialing
^	Toggle calling tone enabled/disabled
!	Modem commanded to go off-hook for amount of time specified in S29 register
@	Wait for quiet answer
,	Dialing paused for amount of time specified in S8 register

DCE LINE SPEED
Type:	Register
Format	AT [cmds] S37=n [cmds]
Description:	Sets the maximum allowable data exchange rate
Command	Function
í S37=0	Automode connection
S37=1	300bps
S37=2	300bps
S37=3	300bps
S37=5	1200bps
S37=6	2400bps
S37=7	V.23 mode
S37=8	4800bps
S37=9	9600bps
S37=10	12.0Kbps
S37=11	14.4Kbps
S37=12	7200bps
S37=15	14.4Kbps
S37=16	V.FC 16.8Kbps
S37=17	V.FC 19.2Kbps
S37=18	V.FC 21.6Kbps

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports product code
I1	Reports ROM checksum
I2	Tests and reports ROM checksum
I3	Reports firmware revision, model identity
I4	Reports model type