MEGAHERTZ 3CXEM556 B, MEGAHERTZ 3CCEM556 B

3COM CORPORATION

Card Type	Modem/Network interface card
Chip Set	Unidentified
I/O Options	RJ-11 port, 15-pin LAN/cellular port
Maximum Modem Rate	56Kbps
Maximum Fax Rate	14.4Kbps
Data Modulation Protocol	ITU-T V.23, V.32, V.32bis, V.34, V.34+, V.90
Fax Modulation Protocol	Unidentified
Error Correction/Compression	MNP5, V.42, V.42bis
Fax Class	Class I & II
Data Bus	PCMCIA Type II/ PCMCIA Type III

55469

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, A/

A, E, F, H, M, O, V

&C, &G, &R, &W, &Z

S Registers

S0, S1, S2, S3, S4, S5, S8, S9, S10, S11, S12, S18, S25, S38

Note: See MHI Help File for full command documentation.

Proprietary AT Command Set

DATA COMPRESSION CONTROL
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Enables data compression modes
Command	Function
&K0	Disable all data compression
&K1	Enable V.42bis, MNP5 data compression
&K2	Enable only V.42bis data compression
&K3	Enables selective data compression

DATA COMPRESSION RESULT CODES
Type:	Configuration
Format:	AT [cmds] &An [cmds]
Description:	Selects result codes reported during data compression
Command	Function
&A0	Disables all data compression result codes
&A1	Enables data compression result codes
&A2	Enables modulation result codes
&A3	Enables data compression result codes and adds V.42bis and MNP indicators

DATA SET READY (DSR)
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Description:	Selects DSR options
Command	Function
&S0	DSR forced high
&S1	DSR high only while modem is handshaking or connected

DATA TERMINAL READY (DTR)
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Description:	Selects modem response to DTR
Command	Function
&D0	Modem does not respond to DTR
&D1	Modem goes to command mode on DTR toggle
&D2	Enable DTE control of DTR

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.
Command	Function
DP	Pulse dialing enabled
DR	Answer mode enabled; originate mode disabled following handshake initiation.
DT	Tone dialing enabled/Pulse dialing disabled
DW	Dialing resumed following dial tone detection
D,	Dialing paused for amount of time specified in S8 register
D!	Flash function initiated. Modem commanded to go off-hook for specified time before returning on-hook.
D@	Wait for Quite Answer function enabled. Modem waits until a "quiet answer," a ring-back signal followed by silence up to the time specified in S7, is received prior to executing the rest of the dial string.
D$	Wait for prompt tone detection function enabled. Waits for prompt tone for amount of time specified by the S7 command.
D;	Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command.
D&	Wait for credit card prompt tone dectection function enabled.

DTE SETTINGS
Type:	Configuration
Format:	AT [cmds] &Bn [cmds]
Description:	Controls DTE settings and speeds
Command	Function
&B0	Enables floating DTE speed
&B1	Enables fixed DTE speed
&B2	Enables fixed DTE speed during data compression

ERROR CORRECTION CONTROL
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects error corrections modes
Command	Mode
&M0	Disables error correction at speeds of 1200bps and faster
&M4	Enables error correction V.42 or MNP at speeds of 1200bps and faster
&M5	Enablse error correction V.42 or MNP at speeds of 1200bps and faster

FACTORY DEFAULT PROFILE
Type:	Configuration
Format:	AT [cmds] &Fn [cmds]
Description:	Sets values in active profile to values found in the default profile
Command	Function
&F0	Sets the factory default profile, using hardware flow control
&F1	Sets the factory default profile, using hardware flow control
&F2	Sets the factory default profile, using software control

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &Hn [cmds]
Description:	Displays information requested
Command	Function
&H0	Disables flow control for received data
&H1	Enables hardware flow control (RTS/CTS) for received data
&H2	Enables software flow control (XON/XOFF) for received data

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Description:	Displays information requested
Command	Function
&I0	Disables flow control for received data
&I1	Enables software control (XON/XOFF) and sends signals to both modems
&I2	Enables software control (XON/XOFF) but sends signals to local modem only
&I3	Enables HP Eng/Ack in Host mode
&I4	Enables HP Eng/Ack in Terminal mode
&I5	Enables software control, sends signals if using error correction, looks for incoming signals if using data compression

REPORT AT COMMANDS
Type:	Immediate
Format:	AT [cmds] $ [cmds]
Description:	Displays the list of AT commands

REPORT AT COMMANDS
Type:	Immediate
Format:	AT [cmds] &$ [cmds]
Description:	Displays the list of AT ampersand commands

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	Tests and reports RAM checksum
I3	Reports firmware version
I4	Reports current modem settings
I5	Reports current user profile
I7	Reports product configuration

SELECT CALL PROGRESS RESULT CODES
Type:	Configuration
Format:	AT [cmds] Xn [cmds]
Description:	Enables selection of code format options
Command	Function
X0	Result codes 0 - 4 enabled.
X1	Result codes 0 - 5 & 10 enabled.
X2	Result codes 0 - 6 & 10 enabled.
X3	Result codes 0 - 5, 7 & 10 enabled.
X4	Result codes 0 - 7 & 10 enabled.

SOFT RESET
Type:	Immediate
Format:	AT [cmds] Zn [cmds]
Description:	Restores modem profiles previously saved in non-volatile RAM using the &W command.
Command	Function
Z0	Resets modem and follows instructions set in Y
Z1	Resets modem and enables profile in &W0
Z2	Resets modem and enables profile in &W1
Z3	Resets modem and enables settings in &F0 and loads factory default profile 1
Z4	Resets modem and enables settings in &F1 and loads factory default profile
Z5	Resets modem and enables settings in &F2 and loads factory default profile 2

SPEAKER VOLUME
Type:	Configuration
Format:	AT [cmds] Ln [cmds]
Description:	Controls speaker volume
Command	Function
L0	Speaker disabled
L1	Enables speaker volume
L2	Enables speaker volume
L3	Enables speaker volume

USER PROFILE SELECTION
Type:	Configuration
Format:	AT [cmds] Yn [cmds]
Description:	Commands modem to use the selcted user profile on the following reset
Command	Function
Y0	Enables user profile in &W0 after the next reset
Y1	Enables user profile in &W1 after the next reset

S(status) Registers

BIT-MAPPED REGISTER S13
Format:	AT [cmds] S13=n [cmds]
Range:	0-255
Unit:	Bit-mapped
Description:	Controls reset criteria, selects delete key and escape code hangup.
Value	Function
S13=1	Reset on DTR loss
S13=2	Enable reduced non-ARQ transmit buffer
S13=4	Set DEL key to backspace function
S13=8	Do "DS0" on DTR
S13=16	Do "DS0" on reset
S13=128	Enables escape code hangup

BIT-MAPPED REGISTER S15
Format:	AT [cmds] S15=n [cmds]
Range:	0-255
Unit:	Bit-mapped
Description:	Controls error correction configuration.
Value	Function
S15=1	Disable MNP/V.42 in V.22 mode
S15=2	Disable MNP/V.42 in V.22bis mode
S15=4	Disable MNP/V.42 in V.32 and V.34 modes
S15=8	Disable MNP handshake
S15=16	Disable MNP Level 4 mode
S15=32	Disable MNP Level 3 mode
S15=64	Enable unusual MNP incompatibility
S15=128	Disable V.42 error correction
S15=136	Disable V.42 detection phase

BIT-MAPPED REGISTER S27
Format	AT [cmds] S27=n [cmds]
Range:	0-111
Unit:	Bit-mapped
Description:	Selects ITU-T/Bell modes.
Value	Function
S27=1	Enables V.21 mode
S27=2	Disables TCM mode
S27=4	Disables V.32 mode
S27=8	Disables 2100Hz
S27=16	Enables V.23 fallback mode
S27=32	Disables V.32bis mode
S27=64	Disables selective reject
S27=128	Enables software compatibility mode

BIT-MAPPED REGISTER S32
Format	AT [cmds] S32=n [cmds]
Range:	0-255
Unit:	Bit-mapped
Description:	Selects connection protocols.
Value	Function
S32=1	Enables V.8 call indicate
S32=2	Enables V.8 mode
S32=8	Disables V.34 modulation
S32=16	Disables V.34+ mode
S32=32	Disables x2 modulation

BIT-MAPPED REGISTER S33
Format	AT [cmds] S33=n [cmds]
Range:	0-255
Unit:	Bit-mapped
Description:	Selects V.34 and V.34+ connection rates.
Value	Function
S33=1	Disables 2400 symbol rate
S33=2	Disables 2743 symbol rate
S33=4	Disables 2800 symbol rate
S33=8	Disables 3000 symbol rate
S33=16	Disables 3200 symbol rate
S33=32	Disables 3429 symbol rate
S33=128	Disables shaping

BIT-MAPPED REGISTER S34
Format	AT [cmds] S34=n [cmds]
Range:	0-255
Unit:	Bit-mapped
Description:	Selects V.34 and V.34+ connection setup modes
Value	Function
S34=16	Disables nonlinear coding
S34=32	Disables transmit level deviation
S34=64	Disables preemphasis
S34=128	Disables precoding

BLIND DIALING DELAY
Type:	Register
Format	AT [cmds] S6=n [cmds]
Range:	2-255
Unit:	1 second
Description:	Duration of delay after modem goes off-hook and before dialing blindly during modes set by X2 or X4 commands.

DIAL TEST MODES
Type:	Register
Format:	AT [cmds] S16=n [cmds]
Range:	2
Unit:	Bit-mapped
Description:	Controls self tests.
Value	Function
S16=2	Enables dial test

ERROR CORRECTION BREAK LENGTH
Type:	Register
Format:	AT [cmds] S21=n [cmds]
Default:	10
Range:	0-255
Unit:	0.1 second
Description:	Sets the break length for error correction

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] S19=n [cmds]
Default:	0
Range:	0-255
Unit:	1 minute
Description:	Sets the duration for the inactivity timer
Note: S19=0 disables the timer and allows an indefinite duration.

NO CARRIER TIME-OUT
Type:	Register
Format	AT [cmds] S7=n [cmds]
Range:	1-255
Unit:	1 second
Description:	Maximum wait time the modem uses after dialing to detect a carrier signal from the remote modem for both originating and answering calls.
Note: W dial modifier also uses S7 to set the maximum time to wait.

V.21 ANSWER FALLBACK TIMER
Type:	Register
Format	AT [cmds] S29=n [cmds]
Range:	0-255
Unit:	.01 second
Description:	Controls the duration of the V.21 answer mode fallback timer

V.32 HANDSHAKE TIMER
Type:	Register
Format	AT [cmds] S28=n [cmds]
Default:	0
Range:	0-255
Unit:	0.8 seconds
Description:	Controls the time duration of handshake in V.32 mode

XOFF CHARACTER
Type:	Register
Format	AT [cmds] S23=n [cmds]
Default:	19
Range:	0-127
Unit:	ASCII
Description:	Sets the ASCII code for the XOFF character

XON CHARACTER
Type:	Register
Format:	AT [cmds] S22=n [cmds]
Default:	17
Range:	0-127
Unit:	ASCII
Description:	Sets the ASCII code for the XON character