3COM CORPORATION
US ROBOTICS 28.8 PC CARD WITH DATAVIEW
US ROBOTICS 28.8 PC CARD FOR POWERBOOK
| 
 Card Type  | 
 Fax, Modem (asynchronous)  | 
| 
 Chip Set  | 
 U.S. Robotics  | 
| 
 I/O options:  | 
 Data View connector  | 
| 
 Maximum Data Rate  | 
 28.8Kbps  | 
| 
 Maximum Fax Rate  | 
 14.4Kbps  | 
| 
 Data Bus  | 
 PCMCIA Type II  | 
| 
 Fax Class  | 
 Class I & II  | 
| 
 Data Modulation Protocol  | 
 Bell 103/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 Rockwell V.FC  | 
| 
 Fax Modulation Protocol  | 
 ITU-T V.17, V.21CH2, V.27ter, V.29  | 
| 
 Error Correction/Compression  | 
 MNP5, V.42, V.42bis  | 

| 
 CONNECTIONS  | ||||||
| 
 Function  | 
 Label  | 
 Function  | 
 Label  | |||
| 
 Line out  | 
 CN1  | 
 Line in  | 
 CN2  | |||
| 
 DIAGNOSTIC LED(S)  | |||
| 
 LED  | 
 Color  | 
 Status  | 
 Condition  | 
| 
 LED 1  | 
 Red  | 
 On  | 
 Power is on  | 
| 
 LED 1  | 
 Red  | 
 Off  | 
 Power is off  | 
| 
 LED 2  | 
 Red  | 
 On  | 
 Modem is transmitting data  | 
| 
 LED 2  | 
 Red  | 
 Off  | 
 Modem is not transmitting data  | 
| 
 LED 3  | 
 Red  | 
 On  | 
 Modem is receiving data  | 
| 
 LED 3  | 
 Red  | 
 Off  | 
 Modem is not receiving data  | 
| 
 LED 4  | 
 Red  | 
 On  | 
 Modem has connected to another modem  | 
| 
 LED 4  | 
 Red  | 
 Off  | 
 Modem has not connected to another modem  | 
| 
 MISCELLANEOUS TECHNICAL NOTES  | 
Note: Data View connector has 4 LED’s that tell you the modem status. See diagnostic LED’s for description. | 
Proprietary AT Command Set
| 
 ABORT  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 Any key  | 
| 
 Description:  | 
 Aborts answering/originating a call; modem hangs up.  | 
| 
 ANSWER  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] A  | 
| 
 Description:  | 
 Enables manual answer mode, the modem goes off-hook; pressing any key will abort.  | 
| 
 ANSWER SEQUENCE  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] Bn [cmds]  | 
| 
 Description:  | 
 Selects the answer sequence the modem will use  | 
| 
 Command  | 
 Function  | 
| 
 í B0 | 
 ITU-T answer sequence enabled  | 
| 
 B1  | 
 Bell answer sequence enabled  | 
| 
 ATTENTION  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds]  | 
| 
 Description:  | 
 Tells the modem that a command follows or use alone to test OK result code  | 
| 
 BAUD RATE  | ||
| 
 Type:  | 
 Register  | |
| 
 Format:  | 
 AT [cmds] S54=n [cmds]  | |
| 
 Default:  | 
 0  | |
| 
 Range:  | 
 0-255  | |
| 
 Unit:  | 
 Bit-mapped  | |
| 
 Description:  | 
 Controls baud rate  | |
| 
 Bit  | 
 Value  | 
 Function  | 
| 
 0  | 
 í 01  | 
 2400 baud rate enabled 2400 baud rate disabled  | 
| 
 1  | 
 í 01  | 
 2743 baud rate enabled 2743 baud rate disabled  | 
| 
 2  | 
 í 01  | 
 2800 baud rate enabled 2800 baud rate disabled  | 
| 
 3  | 
 í 01  | 
 3000 baud rate enabled 3000 baud rate disabled  | 
| 
 4  | 
 í 01  | 
 3200 baud rate enabled 3200 baud rate disabled  | 
| 
 5  | 
 í 01  | 
 3429 baud rate enabled 3429 baud rate disabled  | 
| 
 6  | 
 í 01  | 
 Call indicate during V.34 operation enabled Call indicate during V.34 operation disabled  | 
| 
 7  | 
 í 01  | 
 V.8 during V.34 operation enabled V.8 during V.34 operation disabled  | 
| 
 BIT-MAPPED REGISTER S13  | ||
| 
 Format  | 
 AT [cmds] S13=n [cmds]  | |
| 
 Default:  | 
 0  | |
| 
 Range:  | 
 0-89  | |
| 
 Unit:  | 
 Bit-mapped  | |
| 
 Description:  | 
 Controls DTR reset, DTR dialing, reset dialing, and MNP3.  | |
| 
 Bit  | 
 Value  | 
 Function  | 
| 
 0  | 
 í 01  | 
 DTR normal Reset on low DTR  | 
| 
 1, 2  | 
 í 00 | 
 Not used  | 
| 
 3  | 
 í 01  | 
 DTR dialing disabled DTR dialing enabled, dials number at position 0 in NVRAM.  | 
| 
 4  | 
 í 01  | 
 Reset dialing disabled Reset dialing enabled, dials number at position 0 in NVRAM.  | 
| 
 5  | 
 í 0 | 
 Not used  | 
| 
 6  | 
 í 01  | 
 MNP 3 enabled MNP 3 disabled  | 
| 
 BIT-MAPPED REGISTER S15  | ||
| 
 Format  | 
 AT [cmds] S15=n [cmds]  | |
| 
 Default:  | 
 0  | |
| 
 Range:  | 
 0-56  | |
| 
 Unit:  | 
 Bit-mapped  | |
| 
 Description:  | 
 Controls non-error-correcting mode buffer, MNP4, and BS/DEL switch.  | |
| 
 Bit  | 
 Value  | 
 Function  | 
| 
 0 - 2  | 
 í 0 | 
 Not used  | 
| 
 3  | 
 í 01  | 
 Non-error-correcting mode transmit buffer set to 1.5KB Non-error-correcting mode transmit buffer set to 128 bytes  | 
| 
 4  | 
 í 01  | 
 MNP 4 enabled MNP 4 disabled  | 
| 
 5  | 
 í 01  | 
 Use backspace key for delete disabled Use backspace key for delete enabled  | 
| 
 BIT-MAPPED REGISTER S27  | ||
| 
 Format  | 
 AT [cmds] S27=n [cmds]  | |
| 
 Default:  | 
 0  | |
| 
 Range:  | 
 0-191  | |
| 
 Unit:  | 
 Bit-mapped  | |
| 
 Description:  | 
 Controls V.21, V.32 encoding and modulation, V.42 answer tone and handshake, and 9600 result codes.  | |
| 
 Bit  | 
 Value  | 
 Function  | 
| 
 0  | 
 í 01  | 
 V.21 disabled V.21 enabled  | 
| 
 1  | 
 í 01  | 
 V.32 non-trellis coding disabled V.32 non-trellis coding enabled  | 
| 
 2  | 
 í 01  | 
 V.32 modulation enabled V.32 modulation disabled  | 
| 
 3  | 
 í 01  | 
 2100Hz answer tone enabled 2100Hz answer tone disabled  | 
| 
 5, 4  | 
 í 0001 10 11  | 
 V.42 detect, LAPM and MNP enabled MNP disabled V.42 detect and LAPM disabled V.42 detect disabled and LAPM enabled  | 
| 
 6  | 
 í 0 | 
 Not used  | 
| 
 7  | 
 í 01  | 
 Actual result codes displayed Force 9600 result codes  | 
| 
 BIT-MAPPED REGISTER S48  | |||||
| 
 Format:  | 
 AT [cmds] S48=n [cmds]  | ||||
| 
 Default:  | 
 0  | ||||
| 
 Range:  | 
 0-1  | ||||
| 
 Description:  | 
 Controls the DATA VIEW connector LED’s  | ||||
| 
 Bit  | 
 Value  | 
 Function  | |||
| 
 0  | 
 í 01  | 
 All LED’s enabled Power LED enabled, all others disabled  | |||
| 
 BIT-MAPPED REGISTER S56  | ||
| 
 Format:  | 
 AT [cmds] S56=n [cmds]  | |
| 
 Default:  | 
 0  | |
| 
 Range:  | 
 0-255  | |
| 
 Unit:  | 
 Bit-mapped  | |
| 
 Description:  | 
 Controls non-linear coding, TX level deviation, pre-emphasis, pre-coding, shaping, V.34, and V.FC  | |
| 
 Note: For 28.8 models | ||
| 
 Bit  | 
 Value  | 
 Function  | 
| 
 0  | 
 í 01  | 
 Non linear coding enabled Non linear coding disabled  | 
| 
 1  | 
 í 01  | 
 TX level deviation enabled TX level deviation disabled  | 
| 
 2  | 
 í 01  | 
 Pre-emphasis enabled Pre-emphasis disabled  | 
| 
 3  | 
 í 01  | 
 Pre-coding enabled Pre-coding disabled  | 
| 
 4  | 
 í 01  | 
 Shaping enabled Shaping disabled  | 
| 
 5  | 
 í 0 | 
 Not used  | 
| 
 6  | 
 í 01  | 
 V.34 enabled V.34 disabled  | 
| 
 7  | 
 í 01  | 
 V.FC enabled V.FC disabled  | 
| 
 BREAK LENGTH  | |
| 
 Type:  | 
 Register  | 
| 
 Format:  | 
 AT [cmds] S21=n [cmds]  | 
| 
 Default:  | 
 10  | 
| 
 Range:  | 
 0-255  | 
| 
 Unit:  | 
 .01 second  | 
| 
 Description:  | 
 Sets the length of error control mode breaks sent from DCE to DTE.  | 
| 
 BREAK TYPE  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Yn [cmds]  | 
| 
 Description:  | 
 Configures action of break signal  | 
| 
 Command  | 
 Function  | 
| 
 &Y0  | 
 Empty buffer only  | 
| 
 í &Y1 | 
 Empties buffer and break is sent immediately  | 
| 
 &Y2  | 
 Do not empty buffer and break is sent immediately  | 
| 
 &Y3  | 
 Do not empty buffer or send break  | 
| 
 CARRIER DETECT (CD)  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Cn [cmds]  | 
| 
 Description:  | 
 Controls the CD signal  | 
| 
 Command  | 
 Function  | 
| 
 &C0  | 
 Modem does not respond to CD signal  | 
| 
 í &C1 | 
 CD signal normal  | 
| 
 COMPRESSION  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Kn [cmds]  | 
| 
 Description:  | 
 Selects data compression  | 
| 
 Command  | 
 Function  | 
| 
 &K0  | 
 Data compression disabled  | 
| 
 í &K1 | 
 Auto enabled/disable data compression  | 
| 
 &K2  | 
 Data compression enabled  | 
| 
 &K3  | 
 MNP5 data compression disabled  | 
| 
 COMPRESSION AND ERROR CORRECTION  | ||
| 
 Format  | 
 AT [cmds] S51=n [cmds]  | |
| 
 Default:  | 
 0  | |
| 
 Range:  | 
 0-7  | |
| 
 Unit:  | 
 Bit-mapped  | |
| 
 Description:  | 
 Selects compression and error correction for specific modulations  | |
| 
 Bit  | 
 Value  | 
 Function  | 
| 
 0  | 
 í 01  | 
 MNP/V.42 disabled during V.22 operation MNP/V.42 disabled during V.22 operation  | 
| 
 1  | 
 í 01  | 
 MNP/V.42 disabled during V.22bis operation MNP/V.42 disabled during V.22bis operation  | 
| 
 2  | 
 í 01  | 
 MNP/V.42 disabled during V.32bis operation MNP/V.42 disabled during V.32bis operation  | 
| 
 CONNECTION SPEED  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Nn [cmds]  | 
| 
 Description:  | 
 Sets forced connection speed, modem will hang up if it cannot connect.  | 
| 
 Command  | 
 Function  | 
| 
 í &N0 | 
 Variable  | 
| 
 &N1  | 
 300bps  | 
| 
 &N2  | 
 1200bps  | 
| 
 &N3  | 
 2400bps  | 
| 
 &N4  | 
 4800bps  | 
| 
 &N5  | 
 7200bps  | 
| 
 &N6  | 
 9600bps  | 
| 
 &N7  | 
 12Kbps  | 
| 
 &N8  | 
 14.4Kbps  | 
| 
 &N9  | 
 16.8Kbps  | 
| 
 &N10  | 
 19.2Kbps  | 
| 
 &N11  | 
 21.6Kbps  | 
| 
 &N12  | 
 24Kbps  | 
| 
 &N13  | 
 26.4Kbps  | 
| 
 &N14  | 
 28.8Kbps  | 
| 
 DATA SET READY (DSR)  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Sn [cmds]  | 
| 
 Description:  | 
 Selects DSR options  | 
| 
 Command  | 
 Function  | 
| 
 í &S0 | 
 DSR forced high  | 
| 
 &S1  | 
 DSR controlled by modem  | 
| 
 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 after DTR toggles  | 
| 
 í &D2 | 
 Modem uses DTR as normal  | 
| 
 &D3  | 
 Modem is initialized after DTR goes off  | 
| 
 DIAL  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] D<#> [cmds]  | 
| 
 Example:  | 
 ATDT 443-3388,,,1111;  | 
| 
 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  | 
| 
 í P | 
 Pulse dialing enabled  | 
| 
 T  | 
 Tone dialing enabled  | 
| 
 ,  | 
 Dialing paused for 2 seconds to a maximum amount of time specified in S8 register  | 
| 
 ;  | 
 Modem returned to command state after dialing. Can only be placed at the end of the dial command.  | 
| 
 "  | 
 Dials letters that follow, ATDT"GOMICRO  | 
| 
 !  | 
 Flash function initiated  | 
| 
 /  | 
 125 msec delay before proceeding with dial string  | 
| 
 W  | 
 Dialing resumed following dial tone detection of second dial tone  | 
| 
 @  | 
 Wait for quiet answer, then proceeds to execute the rest of the dial string.  | 
| 
 R  | 
 Answer mode enabled; originate mode disabled following handshake initiation.  | 
| 
 DIAL - LAST NUMBER  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] DL [cmds]  | 
| 
 Description:  | 
 Re-dial last number dialed  | 
| 
 DIAL - STORED NUMBER  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] DSn [cmds]  | 
| 
 Description:  | 
 Dial stored number from memory location n  | 
| 
 DISCONNECT BUFFER DELAY  | |
| 
 Type:  | 
 Register  | 
| 
 Format  | 
 AT [cmds] S38=n [cmds]  | 
| 
 Default:  | 
 0  | 
| 
 Range:  | 
 Unidentified  | 
| 
 Unit:  | 
 1 second  | 
| 
 Description:  | 
 Sets maximum duration allowed during buffered data calls for modem to perform clearing functions after losing carrier-signal or receiving a clear call signal from the remote modem and before initiating hang-up process. A value of 0 will allow the modem to hanging-up after DTR drops.  | 
| 
 DTR CHANGE THRESHOLD  | |
| 
 Type:  | 
 Register  | 
| 
 Format  | 
 AT [cmds] S25=n [cmds]  | 
| 
 Default:  | 
 5  | 
| 
 Range:  | 
 0-255  | 
| 
 Unit:  | 
 .01 second  | 
| 
 Description:  | 
 Sets maximum time a change in the DTR signal will be ignored  | 
| 
 ECHO  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] En [cmds]  | 
| 
 Description:  | 
 Controls echo function; display keyboard commands when enabled.  | 
| 
 Command  | 
 Function  | 
| 
 E0  | 
 Echo function disabled  | 
| 
 í E1 | 
 Echo function enabled  | 
| 
 ECHO - ON-LINE  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] Fn [cmds]  | 
| 
 Description:  | 
 Selects whether data sent while in data mode are echoed  | 
| 
 Command  | 
 Function  | 
| 
 F0  | 
 Local echo enabled  | 
| 
 í F1 | 
 Local echo disabled  | 
| 
 ERROR CORRECTION MODE (ARQ)  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Mn [cmds]  | 
| 
 Description:  | 
 Selects active error correction protocols  | 
| 
 Command  | 
 Function  | 
| 
 &M0  | 
 Normal mode only  | 
| 
 í &M4 | 
 Auto-detect mode  | 
| 
 &M5  | 
 ARQ mode only  | 
| 
 ESCAPE CHARACTER RESPONSE  | |
| 
 Type:  | 
 Register  | 
| 
 Format:  | 
 AT [cmds] S14=n [cmds]  | 
| 
 Description:  | 
 Controls reaction to escape character  | 
| 
 Command  | 
 Function  | 
| 
 í S14=0 | 
 Normal operation  | 
| 
 S14=1  | 
 When +++ is received, modem goes on hook, enters command state and sends NO CARRIER result code.  | 
| 
 ESCAPE SEQUENCE  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 +++AT [cmds] <CR> | 
| 
 Description:  | 
 Initiates the escape sequence and returns the modem to the on-line command state if it receives three escape characters set in S2 within the time allotted by S12.  | 
Note: Do not precede this command with AT. | |
| 
 EXTENDED RESULT CODES  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &An [cmds]  | 
| 
 Description:  | 
 Selects extended result codes  | 
| 
 Command  | 
 Function  | 
| 
 &A0  | 
 Extended result codes disabled  | 
| 
 &A1  | 
 ARQ result codes enabled  | 
| 
 &A2  | 
 ARQ result codes enabled and V.32 result code added  | 
| 
 í &A3 | 
 Error control and compression result codes enabled  | 
| 
 FACTORY DEFAULT PROFILE  | ||
| 
 Type:  | 
 Configuration  | |
| 
 Format:  | 
 AT [cmds] &Fn [cmds]  | |
| 
 Description:  | 
 Loads values in active profile to values found in the default profile, which are READ-ONLY.  | |
| 
 Command  | 
 Function  | |
| 
 &F0  | 
 Generic template  | |
| 
 &F1  | 
 Hardware flow control template  | |
| 
 &F2  | 
 Software flow control template  | |
| 
 FLOW CONTROL CHARACTER - XOFF  | |
| 
 Type:  | 
 Register  | 
| 
 Format:  | 
 AT [cmds] S23=n [cmds]  | 
| 
 Default:  | 
 19  | 
| 
 Range:  | 
 0-127  | 
| 
 Unit:  | 
 ASCII  | 
| 
 Description:  | 
 Sets the character used to represent XOFF.  | 
| 
 FLOW CONTROL CHARACTER - XON  | |
| 
 Type:  | 
 Register  | 
| 
 Format:  | 
 AT [cmds] S22=n [cmds]  | 
| 
 Default:  | 
 17  | 
| 
 Range:  | 
 0-127  | 
| 
 Unit:  | 
 ASCII  | 
| 
 Description:  | 
 Sets the character used to represent XON.  | 
| 
 FLOW CONTROL PASS-THROUGH  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &In [cmds]  | 
| 
 Description:  | 
 Allows modem to act on, then transmit XON/XOFF characters.  | 
| 
 Command  | 
 Function  | 
| 
 í &I0 | 
 Software flow control disabled  | 
| 
 &I1  | 
 XON/XOFF passthrough enabled  | 
| 
 &I2  | 
 XON/XOFF passthrough disabled  | 
| 
 &I3  | 
 ENQ/ACK enabled in host mode  | 
| 
 &I4  | 
 ENQ/ACK enabled in terminal mode  | 
| 
 &I5  | 
 XON/XOFF passthrough disabled in error correction mode  | 
| 
 FLOW CONTROL TYPE  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Hn [cmds]  | 
| 
 Description:  | 
 Sets type of flow control used by modem  | 
| 
 Command  | 
 Function  | 
| 
 &H0  | 
 Flow control disabled  | 
| 
 í &H1 | 
 CTS/RTS flow control enabled  | 
| 
 &H2  | 
 XON/XOFF flow control enabled  | 
| 
 &H3  | 
 CTS/RTS and XON/XOFF flow control enabled  | 
| 
 FLOW CONTROL TYPE  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Rn [cmds]  | 
| 
 Description:  | 
 Controls receive data hardware flow control and RTS signals  | 
| 
 Command  | 
 Function  | 
| 
 &R1  | 
 Modem ignores RTS  | 
| 
 í &R2 | 
 Received data to DTE when RTS is on  | 
| 
 GUARD TONE  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Gn [cmds]  | 
| 
 Description:  | 
 Commands the modem to transmit a guard tone  | 
Note: Used primarily for international data transmission | |
| 
 Command  | 
 Function  | 
| 
 í &G0 | 
 Guard tone disabled  | 
| 
 &G1  | 
 550Hz guard tone enabled  | 
| 
 &G2  | 
 1800Hz guard tone enabled  | 
| 
 HANDSHAKE TIMER  | |
| 
 Type:  | 
 Register  | 
| 
 Format:  | 
 AT [cmds] S28=n [cmds]  | 
| 
 Default:  | 
 8  | 
| 
 Range:  | 
 0-255  | 
| 
 Unit:  | 
 .1 second  | 
| 
 Description:  | 
 Sets the length of handshake time, so modems with V.32bis, V.FC and V.34 are given a chance to connect at 9600bps or higher.  | 
| 
 HOOK CONTROL  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] Hn [cmds]  | 
| 
 Description:  | 
 Selects whether the modem is on-hook or off-hook  | 
| 
 Command  | 
 Function  | 
| 
 H0  | 
 Modem commanded to go on-hook (hang-up)  | 
| 
 H1  | 
 Modem commanded to go off-hook (pick-up)  | 
| 
 INACTIVITY TIMER  | |
| 
 Type:  | 
 Register  | 
| 
 Format:  | 
 AT [cmds] S19=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.  | 
| 
 LIST AMPERSAND COMMANDS  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] &$ [cmds]  | 
| 
 Description:  | 
 Displays ampersand (&) commands  | 
| 
 LIST DIAL COMMANDS  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] D$ [cmds]  | 
| 
 Description:  | 
 Displays dial commands  | 
| 
 LIST S-REGISTERS  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] S$ [cmds]  | 
| 
 Description:  | 
 Displays the S-registers  | 
| 
 LOCK SERIAL PORT  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Bn [cmds]  | 
| 
 Description:  | 
 Sets operation of serial port speed  | 
| 
 Command  | 
 Function  | 
| 
 &B0  | 
 Serial speed follows connect speed  | 
| 
 í &B1 | 
 Serial speed locked  | 
| 
 &B2  | 
 Serial speed locked in ARQ mode and variable in non-ARQ mode  | 
| 
 MAPPING  | ||||||
| 
 Format:  | 
 AT [cmds] S55=n [cmds]  | |||||
| 
 Default:  | 
 0  | |||||
| 
 Range:  | 
 0-15  | |||||
| 
 Unit:  | 
 Bit-mapped  | |||||
| 
 Description:  | 
 Controls all Map options  | |||||
| 
 Bit  | 
 Value  | 
 Function  | ||||
| 
 0  | 
 í 01  | 
 8S-2D map enabled 8S-2D map disabled  | ||||
| 
 1  | 
 í 01  | 
 16S-4D map enabled 16S-4D map disabled  | ||||
| 
 2  | 
 í 01  | 
 32S-2D map enabled 32S-2D map disabled  | ||||
| 
 3  | 
 í 01  | 
 64S-4D map enabled 64S-4D map disabled  | ||||
| 
 ON-LINE  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] On [cmds]  | 
| 
 Description:  | 
 Controls on-line command (data transmission) mode 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  | 
| 
 ON-LINE HELP  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] $ [cmds]  | 
| 
 Description:  | 
 On-line help; displays basic command list  | 
| 
 POWER-UP/HARD RESET CONFIGURATIONS  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] Yn [cmds]  | 
| 
 Description:  | 
 On power-up modem uses default profiles  | 
| 
 Command  | 
 Function  | 
| 
 í Y0 | 
 Use default setting 0 saved in non-volatile RAM  | 
| 
 Y1  | 
 Use default setting 1 saved in non-volatile RAM  | 
| 
 Y2  | 
 Use default setting 2 saved in non-volatile RAM  | 
| 
 Y3  | 
 Use default setting 3 saved in non-volatile RAM  | 
| 
 Y4  | 
 Use default setting 4 saved in non-volatile RAM  | 
| 
 PULSE DIALING  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] P [cmds]  | 
| 
 Description:  | 
 Enables pulse dialing  | 
Note: This command can be duplicated with the P modifier in the D (Dial) command. | |
| 
 PULSE DIALING RATIO  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Pn [cmds]  | 
| 
 Description:  | 
 Selects pulse dial make/break ratio  | 
| 
 Command  | 
 Function  | 
| 
 í &P0 | 
 39/61ms at 10pps (North America)  | 
| 
 &P1  | 
 33/67ms at 10pps (Europe)  | 
| 
 REPEAT PREVIOUS COMMAND  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 A/  | 
| 
 Description:  | 
 Repeats previous command, mainly used for redial  | 
Note: Do not precede this command with AT, or follow it with <CR>. | |
| 
 REPORT INFORMATION  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] In [cmds]  | 
| 
 Description:  | 
 Displays information requested  | 
| 
 Command  | 
 Function  | 
| 
 I0  | 
 Reports 4-digit product code  | 
| 
 I1  | 
 Reports ROM checksum  | 
| 
 I2  | 
 Reports RAM checksum  | 
| 
 I3  | 
 Reports product type  | 
| 
 I4  | 
 Reports current command settings  | 
| 
 I5  | 
 Reports NVRAM settings  | 
| 
 I6  | 
 Reports link diagnostics  | 
| 
 I7  | 
 Reports product configuration  | 
| 
 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  | 
 Result code sending enabled while in originate mode  | 
| 
 RESULT CODE FORMAT  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] Vn [cmds]  | 
| 
 Description:  | 
 Selects word or numeric format for information-text and result codes  | 
| 
 Command  | 
 Function  | 
| 
 V0  | 
 Numeric format enabled  | 
| 
 í V1 | 
 Verbose (word) format enabled  | 
| 
 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, 10-107 enabled  | 
| 
 X2  | 
 Busy tone detection disabled, dial tone detection enabled; result codes 0-6, 10-107 enabled; also adaptive dialing, wait for second dial tone, and fast dialing enabled.  | 
| 
 X3  | 
 Busy tone detection enabled, dial tone detection disabled; result codes 0-5, 7-107 enabled; also adaptive dialing, and wait for answer enabled.  | 
| 
 X4  | 
 Busy and dial tone detection enabled; result codes 0-107 enabled; also adaptive dialing, wait for second dial tone, wait for answer, and fast dialing enabled.  | 
| 
 Note: Valid numeric result codes; 0-8, 10, 13, 18, 20, 21, 25, 43, 85, 91, 99, 103, and 107. | |
| 
 SOFT RESET  | |
| 
 Type:  | 
 Immediate  | 
| 
 Format:  | 
 AT [cmds] Zn [cmds]  | 
| 
 Description:  | 
 Restores modem profiles previously saved in non-volatile RAM  | 
| 
 Command  | 
 Function  | 
| 
 í Z0 | 
 Restore setting used by ATY command  | 
| 
 Z1  | 
 Restore setting 0  | 
| 
 Z2  | 
 Restore setting 1  | 
| 
 Z3  | 
 Restore factory setting 0 (AT&F0)  | 
| 
 Z4  | 
 Restore factory setting 1 (AT&F1)  | 
| 
 Z5  | 
 Restore factory setting 2 (AT&F2)  | 
| 
 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.  | 
| 
 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  | 
| 
 STATUS-REGISTER  | ||
| 
 Type:  | 
 Configuration  | |
| 
 Format:  | 
 Read: AT [cmds] Sn? [cmds] Write: AT [cmds] Sn=x [cmds]  | |
| 
 Description:  | 
 Writes to or reads from a specified register  | |
Note: See the section on S-registers for detailed listing of commonly used S-registers. | ||
| 
 Command  | 
 Function  | |
| 
 Sn.b=x  | 
 Write to register bit b using values 0 (off) and 1 (on) for x  | |
| 
 STORE ACTIVE PROFILE  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] &Wn [cmds]  | 
| 
 Description:  | 
 Writes the values for the active profile into the non-volatile RAM templates  | 
| 
 Command  | 
 Function  | 
| 
 &W0  | 
 Write the active profile to stored profile 0  | 
| 
 &W1  | 
 Write the active profile to stored profile 1  | 
| 
 STORE TELEPHONE NUMBER  | ||
| 
 Type:  | 
 Configuration  | |
| 
 Format:  | 
 AT [cmds] &Zn=x [cmds]  | |
| 
 Description:  | 
 Writes selected telephone numbers into the non-volatile memory at location n  | |
Note: The characters described in the D command are valid for use in the &Z command. | ||
| 
 Command  | 
 Function  | |
| 
 &Zn=L  | 
 Writes last executed dial string into the non-volatile memory at location n  | |
| 
 &Zn?  | 
 Displays phone number from non-volatile memory at location n  | |
| 
 &ZL?  | 
 Displays last executed dial string  | |
| 
 TEST MODES  | ||
| 
 Type:  | 
 Configuration  | |
| 
 Format:  | 
 AT [cmds] &Tn [cmds]  | |
| 
 Description:  | 
 Controls loopback tests, analog, digital, remote digital, and self tests.  | |
| 
 Command  | 
 Function  | |
| 
 &T0  | 
 Testing disabled  | |
| 
 &T1  | 
 Local analog loopback enabled  | |
| 
 &T3  | 
 Local digital loopback enabled  | |
| 
 &T4  | 
 Remote digital loopback enabled  | |
| 
 í &T5 | 
 Remote digital loopback prohibited  | |
| 
 &T6  | 
 Remote digital loopback initiated  | |
| 
 &T7  | 
 Remote digital loopback w/ self-test and error detector in progress  | |
| 
 &T8  | 
 Local analog loopback w/ self-test and error detector in progress  | |
| 
 TEST TIMER  | |
| 
 Type:  | 
 Register  | 
| 
 Format  | 
 AT [cmds] S18=n [cmds]  | 
| 
 Default:  | 
 0  | 
| 
 Range:  | 
 0-255  | 
| 
 Unit:  | 
 1 second  | 
| 
 Description:  | 
 Sets the maximum duration for modem tests  | 
Note: S18=0 disables the timer and allows an indefinite duration. | |
| 
 TONE DIALING  | |
| 
 Type:  | 
 Configuration  | 
| 
 Format:  | 
 AT [cmds] T [cmds]  | 
| 
 Description:  | 
 Enables tone dialing mode  | 
Note: This command can be duplicated with the T modifier in the D (Dial) command. | |
| 
 TONE DIALING TEST  | |
| 
 Type:  | 
 Register  | 
| 
 Format:  | 
 AT [cmds] S16=n [cmds]  | 
| 
 Description:  | 
 Selects the tone dialing test  | 
| 
 Command  | 
 Function  | 
| 
 í S16=0 | 
 Tone dialing test disabled  | 
| 
 S16=2  | 
 Tone dialing test enabled  | 
| 
 V.23 AND V.32bis MODULATIONS  | ||
| 
 Format  | 
 AT [cmds] S34=n [cmds]  | |
| 
 Default:  | 
 0  | |
| 
 Range:  | 
 0-9  | |
| 
 Unit:  | 
 Bit-mapped  | |
| 
 Description:  | 
 Controls V.23 and V.32bis modulations.  | |
| 
 Bit  | 
 Value  | 
 Function  | 
| 
 0  | 
 0 1  | 
 V.32bis enabled V.32bis disabled  | 
| 
 2, 1  | 
 00  | 
 Not used  | 
| 
 3  | 
 0 1  | 
 V.23 modulation disabled V.23 modulation enabled  |