PURE DATA, LTD.

CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	Line in	CN2

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, ‘comma’, A/

A, B, E, H, L, Q, V, Y, Z

&D, &F, &G, &M, &R, &V, &W, &X, &Y, &Z

Extended AT Commands

\A, \B, \C, \G, \J, \K, \O, \Q, \T, \U, \X, \Y, \Z

%A, %C, %E

S Registers

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

Special Commands

"H, "O, -J

Note: See MHI Help File for full command documentation.

ACCEPT RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \U [cmds]
Example:	AT \U B1<CR>
Description:	Accepts remote modem’s request for reliable link.

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Configuration
Format:	AT [cmds] %An [cmds]
Example:	AT%A20<CR>
Default:	13
Range:	0-127
Unit:	ASCII
Description:	Sets the character used as the auto-reliable fallback character. %A0 will disable this function.

AUTO-RELIABLE TIME BUFFER CONFIGURATION
Type:	Configuration
Format:	AT [cmds] \Cn [cmds]
Example:	AT \C1 &W<CR>
Description:	Controls the handling of incoming data during auto-reliable time period.
Command	Function
í \CO	Data is discarded.
\C1	Data is buffered.
\C2	Data is discarded, sets to normal mode and sends auto-reliable character to serial port.

AUTO-RETRAIN
Type:	Configuration
Format:	AT %En
Example:	AT %E1 <CR>
Description:	Selects auto-retrain mode.
Command	Function
%E0	Auto-retrain disabled.
í %E1	Auto-retrain enabled.
%E2	Auto-retrain enabled (V.32bis comaptibility).

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14=n [cmds]
Example:		ATS14=138<CR>
Default:		138
Range:		0-174
Unit:		Bit-mapped
Description:		Controls echo, result codes, result code display, dial mode, and answer/originate mode.
Bit	Value		Function
0	0		Not used.
1	0 í 1		Command echo disabled. Command echo enabled.
2	í 0 1		Result codes enabled. Result codes disabled.
3	0 í 1		Display result codes in numeric format. Display result codes in verbose format.
4	0		Not used.
5	í 0 1		Tone dial enabled. Pulse dial enabled.
6	0		Not used.
7	0 í 1		Answer mode enabled. Originate mode enabled.

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Example:		ATS21=48<CR>
Default:		48
Range:		0 - 253
Unit:		Bit-mapped
Description:		Selects CTS signal, low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function.
Note: For bit 1 please see bits 1-3 of S23.
Bit	Value		Function
0, 5	00 í 01 10		DCD forced high. DCD normal. DCD Unix compatibility.
1	í 0 1		Select serial speed option 1 (S23) Select serial speed option 2 (S23)
2	í 0 1		CTS follows RTS. CTS forced high.
4, 3	00 01 í 10 11		DTR signal ignored. Modem goes to command mode on low DTR. Modem disconnects on low DTR. Auto-Answer is disabled. Modem is initialized on low DTR.
6	í 0 1		DSR forced high. DSR normal.
7	í 0 1		Long Space Disconnect function disabled. Long Space Disconnect function enabled.

BIT-MAPPED REGISTER S22
Format		AT [cmds] S22=n [cmds]
Example:		ATS22=118<CR>
Default:		118
Range:		0-255
Unit:		Bit-mapped
Description:		Controls speaker volume and controls, and limits results codes.
Bit	Value		Function
1, 0	00 01 í 10 11		Very low volume. Low volume. Medium level volume. High level volume.
3, 2	00 í 01 10 11		Speaker off. Speaker off on carrier. Speaker always on. Speaker on during handshake.
6, 5, 4	000 011 100 101 110 í 111		Busy and dialtone detection disabled, result codes 0-4 enabled. Busy and dialtone detection enabled, result codes 0-4, 6, 7 enabled. Busy and dialtone detection disabled, result codes 0-5, 9-20 enabled. Busy tone detection disabled, dialtone detection and result codes 0-6, 9-20 enabled. Busy tone detection and result codes 0-5, 7, 9-20 enabled, dialtone detection disabled. Busy and dialtone detection enabled, result codes 0-7, 9-20 enabled.
7	í 0 1		Pulse dialing at 39/61ms at 10pps. Pulse dialing at 33/67ms at 10pps.

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Example:		ATS23=11<CR>
Default:		11
Range:		0-255
Unit:		Bit-mapped
Description:		Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone.
Note: Bits 1-3 are set by bit 1 in S21.
Bit	Value		Function
0	0 í 1		Remote digital loopback denied. Remote digital loopback allowed.
3, 2, 1	000 001 010 011 í 101 110 111		Option 1 Sets serial port speed to 0-300bps. 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.	Option 2 Sets serial port speed to 12Kbps. Sets serial port speed to 14.4Kbps. Sets serial port speed to 57.6Kbps. Sets serial port speed to 76.8Kbps. Sets serial port speed to 115.2Kbps.
5,4	í 00 01 10 11		Parity even. No Parity. Parity odd. Mark Parity
7, 6	í 00 01 10		Guard tone disabled. Guard tone 550Hz enabled. Guard tone 1800Hz enabled.

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Example:		AT S27=9 <CR>
Default:		64
Range:		0 - 127
Unit:		Bit-mapped
Description:		Selects synchronous/asynchronous mode, line type, V.25 answer tone, internal clock, and ITU-T/Bell modes.
Bit	Value		Function
1, 0	í 00 01 10 11		Asynchronous mode, serial port speed follows connect speed. Asynchronous command mode and synchronous connect mode. Asynchronous command mode and synchronous connect mode, DTR dialing enabled. Asynchronous command mode on low DTR, synchronous connect mode on high DTR.
7, 2	í 00 01 11		Dial up line. Leased line. Leased line autoconnect.
3	0 1		No delay when answering a call, used in US for answering domestic calls. 2 second delay prior to V.25 answer tone, used in US for answering international calls.
5, 4	í 00 01 10		Internal DCE transmit clock source. External DTE transmit clock source. Remote DCE transmit clock source.
6	0 í 1		CCITT mode. Bell mode.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B3 &W<CR>
Default:	3
Range:	1-9
Unit:	.1 second
Description:	Sends break to modem.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] \Kn [cmds]
Example:	AT \K1 <CR>
Description:	Configures action of break signal.
Command		Break from DTE	Modem receives \B	Break received from remote modem
\K0		Online command mode enabled, send no break to remote modem.	Break sent to remote modem and buffered cleared.	Buffers cleared, break sent to DTE.
\K1		Break sent to remote modem and buffered cleared.	Break sent to remote modem and buffered cleared.	Buffers cleared, break sent to DTE.
\K2		Online command mode enabled, send no break to remote modem.	Send break to remote modem immediately.	Break sent immediately to DTE.
\K3		Send break to remote modem immediately.	Send break to remote modem immediately.	Break sent immediately to DTE.
\K4		Online command mode enabled, send no break to remote modem.	Send break with transmitted data.	Break sent with received data to the DTE.
í \K5		Send break with transmitted data.	Send break with transmitted data.	Break sent with received data to the DTE.

BUFFER SIZE
Type:	Register
Format:	AT [cmds] S29=n [cmds]
Example:	ATS29=6<CR>
Default:	255
Range:	0-255
Unit:	2 bytes (1 word)
Description:	Selects the size of the send/receive buffer.
Note: S29=255 sets the buffer size to 1024 bytes.

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	Asynchronous off-line command mode and synchronous connect mode.
&Q2	Asynchronous off-line command mode - modem autodials first number in directory, then synchronous connect mode.
&Q3	Asynchronous off-line command mode on low DTR, synchronous connect mode on high DTR.

COMPRESSION
Type:	Configuration
Format:	AT [cmds] %Cn [cmds]
Example:	AT *EC0 %C1 *AP0<CR>
Description:	Selects data compression.
Command	Function
%C0	Data compression disabled.
í %C1	Data compression enabled.

CONNECT MODE
Type:	Configuration
Format:	AT [cmds] \Nn [cmds]
Example:	AT \N1 DT555-1212<CR>
Description:	Sets connect mode.
Command	Function
\N0	Normal mode enabled.
\N1	Diagnostic mode enabled.
\N2	Reliable mode enabled.
í \N3	Auto-reliable mode enabled.
\N4	LAPM mode enabled.

CONVERT TO RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \Y [cmds]
Example:	AT \Y<CR>
Description:	Initiates reliable mode link.

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

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.
DS=n	Dial stored telephone number n
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;	Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command.

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] \Vn [cmds]
Description:	Selects modem port flow control.
Command	Function
\V0	Extended result codes disabled.
\V1	Extended result codes enabled.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] \Qn [cmds]
Example:	AT \Q0 A <CR>
Description:	Sets type of flow control used by modem.
Command	Function
\Q0	Flow control disabled.
\Q1	XON/XOFF flow control enabled.
\Q2	CTS flow control to DTE enabled.
í \Q3	RTS/CTS flow control enabled.

HANDSHAKE TIMING
Type:	Configuration
Format:	AT [cmds] "Sn [cmds]
Example:	AT "S0 &W<CR>
Description:	Controls the time the modem waits before handshake-responding to remote modem.
Command	Function
í "S0	Modem waits 3 seconds after receiving handshake tone then responds to remote modem.
"S1	Modem waits 1.6 seconds after receiving handshake tone then responds to remote modem.
"S2	Same as "S0, then performs fast handshaking with V.32/32bis modems.
"S3	Same as "S1, then performs fast handshaking with V.32/32bis modems.

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] \Tn [cmds]
Example:	AT\T20<CR>
Default:	0
Range:	0-90
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects.

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] \Jn [cmds]
Example:	AT %L3 %B14 \J0<CR>
Description:	Sets operation of serial port speed.
Command	Function
í \J0	Serial speed locked.
\J1	Serial speed follows connect speed.

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Configuration
Format:	AT [cmds] \An [cmds]
Example:	AT \A3 &MB28800<CR>
Description:	Sets the maximum transmittable block size.
Command	Function
\A0	Maximum MNP block size is 64 characters.
\A1	Maximum MNP block size is 128 characters.
\A2	Maximum MNP block size is 192 characters.
í \A3	Maximum MNP block size is 256 characters.

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	Return to on-line command mode.
O1	Return to on-line command mode with retraining enabled.
O2	Fall back, return to online command mode.
O3	Fall forward, return to online command mode.

ON-LINE IN RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \O
Example:	AT \O <CR>
Description:	Returns to on-line and requests reliable mode connection.

PROTOCOL/SPEED
Type:	Register
Format:	AT [cmds] S31=n [cmds]
Example:	AT S31=10 <CR>
Description:	Selects the current DCE speed.
Command	Function
í S37=0	Select last ATspeed.
S37=3	Select 300bps speed.
S37=5	Select 1200bps speed.
S37=6	Select 2400bps speed.
S37=7	Select 4800bps speed.
S37=8	Select 7200bps speed.
S37=9	Select 9600bps speed.
S37=10	Select 12Kbps speed.
S37=11	Select 14.4Kbps speed.

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 ROM checksum
I3		Reports manufacturer and model information
I4		Reports data connection information

RETRAIN COUNTER
Type:	Register
Format:	AT [cmds] S30=n [cmds]
Example:	ATS30=6<CR>
Default:	0
Range:	0-255
Unit:	1 retrain
Description:	Counts the number of times the modem attempted to retrain since power-up.

SELECT CALL PROGRESS RESULT CODES
Type:	Configuration
Format:	AT [cmds] Xn [cmds]
Description:	Enables selection of tone detection and associated result code format options
Command	Function
X0	Busy and dial tone detection disabled; result codes 0 - 4 enabled.
X1	Busy and dial tone detection disabled; result codes 0 - 5 & 9 - 20 enabled.
X2	Busy tone detection disabled, dial tone detection enabled; result codes 0 - 6 & 9 - 20 enabled.
X3	Busy tone detection enabled, dial tone detection disabled; result codes 0 - 5, 7 & 9 - 20 enabled.
í X4	Busy and dial tone detection enabled; result codes 0 - 7 & 9 - 20 enabled.
X5	Busy and dial tone detection enabled; result codes 0, 4, 6 & 7 enabled.

SPEAKER MODE
Type:	Configuration
Format:	AT [cmds] Mn [cmds]
Description:	Selects various speaker options
Command	Function
M0	Speaker disabled
í M1	Speaker enabled until carrier signal detected
M2	Speaker enabled
M3	Speaker enabled following dialing, then disabled after carrier signal detected.
M4	Speaker enabled until carrier signal detected, on during retrain.
M5	Speaker enabled following dialing, then disabled after carrier signal detected, on during retrain.

SWITCH TO MNP MODE
Type:	Configuration
Format:	AT [cmds] \Z [cmds]
Example:	AT \Z &W<CR>
Description:	Switches to normal mode from MNP mode.

TEST MODES
Format		AT [cmds] S16=n [cmds]
Example:		ATS16=40<CR>
Default:		0
Range:		0-125
Unit:		Bit-mapped
Description:		Controls loopback tests, analog, digital, remote digital, and self tests.
Bit	Value		Function
0	í 0 1		Local analog loopback not in progress. Local analog loopback in progress.
1	0		Not used.
2	í 0 1		Local digital loopback not in progress. Local digital loopback in progress.
3	í 0 1		Modem not in remote digital loopback. Remote digital loopback in progress.
4	í 0 1		Remote digital loopback not requested. Remote digital loopback requested.
5	í 0 1		Remote digital loopback w/ self-test not in progress. Remote digital loopback w/ self-test in progress.
6	í 0 1		Local analog loopback w/ self-test not in progress. Local analog loopback w/ self-test in progress.

TEST MODES
Type:	Immediate
Format:	AT [cmds] &Tn
Description:	Selects test options
Command	Function
&T0	End current test
&T1	End current test
&T8	Begin local analog loopback and self-test

TIMED MNP RELIABLE CONNECTION
Type:	Register
Format:	AT [cmds] S28=n [cmds]
Example:	ATS28=8<CR>
Default:	8
Range:	0-255
Unit:	1 second
Description:	Controls the time the modem takes to make a MNP reliable connection, if the threshold is exceeded the modem falls back to a normal connection.
Note: S28=0 sets the factory default, 8 seconds. S28=(1-4) causes the modem to make a normal connection.

V.42 DETECTION PHASE
Type:	Configuration
Format:	AT [cmds] -Jn [cmds]
Example:	AT -J1 &W<CR>
Description:	Controls V.42 detection.
Command	Function
-J0	V.42 detection disabled.
í -J1	V.42 detection enabled.

V.42bis COMPRESSION CONTROL
Type:	Configuration
Format:	AT [cmds] "Hn [cmds]
Example:	AT "H3 &W<CR>
Description:	Controls V.42bis data compression
Command	Function
"H0	V.42bis disabled.
"H1	V.42bis when transmitting enabled.
"H2	V.42bis when receiving enabled.
í "H3	V.42bis when transmitting/receiving enabled.

V.42bis MAXIMUM STRING LENGTH
Type:	Immediate
Format:	AT [cmds] "O=n [cmds]
Example:	AT "O=32 <CR>
Default:	250
Range:	6 - 250
Unit:	Unidentified
Description:	Selects string size for V.42bis compression.

XON/XOFF PASS-THROUGH
Type:	Configuration
Format:	AT [cmds] \Xn [cmds]
Example:	AT \X0<CR>
Description:	Selects whether XON/XOFF signals are sent to remote modem.
Command	Function
í \X0	XON/XOFF signals trapped by local modem.
\X1	XON/XOFF passed through local modem.