3COM CORPORATION US ROBOTICS WINMODEM 28.8 Card Type Fax, Modem (asynchronous) Chip Set U.S. Robotics Maximum Data Rate 28.8Kbps Maximum Fax Rate 14.4Kbps Data Bus 8-bit ISA Fax Class Class I & II Data Modulation Protocol Bell 103/212A ITU-T V.21, V.22, V.22bis, V.23, V.25, V.32, V.32bis, V.34 Fax Modulation Protocol ITU-T V.17, V.21CH2, V.27ter, V.29 Error Correction/Compression MNP5, V.42, V.42bis [Image] CONNECTIONS Function Label Function Label Line in CN1 Line out CN2 Proprietary AT Command Set ANSWER Type: Immediate Format: AT [cmds] A Description: Enables manual answer mode, the modem goes off-hook; pressing any key will abort. ABORT Type: Immediate Format: Any key Description: Aborts answering/originating a call; modem hangs up. ANSWER SEQUENCE Type: Configuration Format: AT [cmds] Bn [cmds] Description: Selects the answer sequence the modem will use Command Function B0 ITU-T answer sequence enabled B1 U.S.(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 BIT-MAPPED REGISTER S13 Format AT [cmds] S13=n [cmds] Default: 0 Range: 0-159 Unit: Bit-mapped Description: Controls DTR reset, non-error-correcting mode buffer, DTR dialing, reset dialing, and disconnect. Bit Value Function 0 0 DTR normal 1 Reset on low DTR 1 0 Non-error-correcting mode transmit buffer set to 1.5KB 1 Non-error-correcting mode transmit buffer set to 128 bytes 2 0 Use backspace key for delete disabled 1 Use backspace key for delete enabled 3 0 DTR dialing disabled 1 DTR dialing enabled 4 0 Reset dialing disabled 1 Reset dialing enabled, dials number at position 0 in NVRAM. 6, 5 00 Not used 7 0 Disconnect as normal 1 Disconnect on escape code BIT-MAPPED REGISTER S15 Format AT [cmds] S15=n [cmds] Default: 0 Range: 0-255 Unit: Bit-mapped Description: Controls ARQ/MNP for V.22/22bis/32/32bis/32terbo, V.42 detection, MNP4 and 3, and MNP incompatibility. Bit Value Function 0 0 Error correction and data compression enabled for V.22 1 Error correction and data compression disabled for V.22 1 0 Error correction and data compression enabled for V.22bis 1 Error correction and data compression disabled for V.22bis 2 0 Error correction and data compression enabled for V.32/32bis/32terbo 1 Error correction and data compression disabled for V.32/32bis/32terbo 7, 3 00 V.42 detection disabled 4 0 MNP 4 enabled 1 MNP 4 disabled 5 0 MNP 3 enabled 1 MNP 3 disabled 6 0 MNP normal 1 MNP adjusted for non compliant modems 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 0 V.21 disabled 1 V.21 enabled 1 0 V.32 non-trellis coding disabled 1 V.32 non-trellis coding enabled 2 0 V.32 modulation enabled 1 V.32 modulation disabled 3 0 2100Hz answer tone enabled 1 2100Hz answer tone disabled 4 0 V.23 fallback mode disabled 1 V.23 fallback mode enabled 5 0 V.32bis enabled 1 V.32bis disabled 6 0 Not used 7 0 Actual result codes displayed 1 Force 9600 result codes BIT-MAPPED REGISTER S32 Format: AT [cmds] S32=n [cmds] Default: 2 Range: 0-27 Description: Controls call indicate, V.8, V.34, and 33.6Kbps support Note: For 28.8 models Bit Value Function 0 0 Call indicate during V.34 operation disabled 1 Call indicate during V.34 operation enabled 1 0 V.8 during V.34 operation disabled 1 V.8 during V.34 operation enabled 2 0 Not used 3 0 V.34 enabled 1 V.34 disabled 4 0 33.6Kbps support enabled 1 33.6Kbps support disabled BIT-MAPPED REGISTER S33 Format: AT [cmds] S33=n [cmds] Default: 0 Range: 0-191 Description: Controls baud rate and shaping. Note: For 28.8 models Bit Value Function 0 0 2400 baud rate enabled 1 2400 baud rate disabled 1 0 2743 baud rate enabled 1 2743 baud rate disabled 2 0 2800 baud rate enabled 1 2800 baud rate disabled 3 0 3000 baud rate enabled 1 3000 baud rate disabled 4 0 3200 baud rate enabled 1 3200 baud rate disabled 5 0 3429 baud rate enabled 1 3429 baud rate disabled 6 0 Not used 7 0 Shaping enabled 1 Shaping disabled BIT-MAPPED REGISTER S34 Format: AT [cmds] S34=n [cmds] Default: 0 Range: 0-255 Description: Controls mapping, non-linear coding, TX level deviation, pre-emphasis, and pre-coding. Note: For 28.8 models Bit Value Function 0 0 8S-2D map enabled 1 8S-2D map disabled 1 0 16S-4D map enabled 1 16S-4D map disabled 2 0 32S-2D map enabled 1 32S-2D map disabled 3 0 64S-4D map enabled 1 64S-4D map disabled 4 0 Non linear coding enabled 1 Non linear coding disabled 5 0 TX level deviation enabled 1 TX level deviation disabled 6 0 Pre-emphasis enabled 1 Pre-emphasis disabled 7 0 Pre-coding enabled 1 Pre-coding disabled BREAK LENGTH Type: Register Format: AT [cmds] S21=n [cmds] Default: 10 Range: Unidentified 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 &Y1 Empties buffer and break is sent immediately &Y2 Do not empty buffer and break is sent immediately 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 &C1 CD signal normal COMPRESSION Type: Configuration Format: AT [cmds] &Kn [cmds] Description: Selects data compression Command Function &K0 Data compression disabled &K1 Auto enabled/disable data compression &K2 Data compression enabled &K3 MNP5 data compression disabled CONNECTION SPEED LOWER LIMIT Type: Configuration Format: AT [cmds] &Un [cmds] Description: Sets minimum required connection speed Note: 16.8 - 28.8bps for 28.8 models Command Function &U0 Disabled &U1 300bps &U2 1200bps &U3 2400bps &U4 4800bps &U5 7200bps &U6 9600bps &U7 12Kbps &U8 14.4Kbps &U9 16.8Kbps &U10 19.2Kbps &U11 21.6Kbps &U12 24Kbps &U13 26.4Kbps &U14 28.8Kbps CONNECTION SPEED UPPER LIMIT Type: Configuration Format: AT [cmds] &Nn [cmds] Description: Sets maximum required connection speed, modem will hang up if it cannot connect. Note: 16.8 - 28.8bps for 28.8 models Command Function &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 &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 &D2 Modem uses DTR as normal 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 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 ms delay before proceeding with dial string W Dialing resumed following dial tone detection of second dial tone @ Wait for quiet answer, then procedes to execute the rest of the dial string. R Answer mode enabled; originate mode disabled following handshake initiation. # and * Extended touch tone pad tones 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: 20 Range: Unidentified 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 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 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 &M4 Auto-detect mode &M5 ARQ mode only ESCAPE SEQUENCE Type: Immediate Format: +++AT [cmds] 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 &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 PASSTHROUGH Type: Configuration Format: AT [cmds] &In [cmds] Description: Allows modem to act on, then transmit XON/XOFF characters. Command Function &I0 Software flow control disabled &I1 XON/XOFF pass-through enabled &I2 XON/XOFF pass-through disabled FLOW CONTROL TYPE - RECEIVE DATA Type: Configuration Format: AT [cmds] &Rn [cmds] Description: Controls receive data hardware flow control and RTS signals Command Function &R1 Modem ignores RTS &R2 Received data to DTE when RTS is on FLOW CONTROL TYPE - TRANSMIT DATA Type: Configuration Format: AT [cmds] &Hn [cmds] Description: Sets type of flow control used by modem Command Function &H0 Flow control disabled &H1 CTS/RTS flow control enabled &H2 XON/XOFF flow control enabled &H3 CTS/RTS and XON/XOFF flow control enabled 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 &G0 Guard tone disabled &G1 550Hz guard tone enabled &G2 1800Hz guard tone enabled HELP SCREEN - CONTROLS Type: Immediate Format: C, K or S Description: Cancel or starts/restarts help screens Command Function C Display of help screen canceled K Display of help screen canceled S Starts/restarts help screens 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: Unidentified 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: Not used. Modem follows COM port speed if it changes, even while on-line. 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 Y0 Use default setting 0 saved in non-volatile RAM Y1 Use default setting 1 saved in non-volatile RAM Y2 Generic template Y3 Hardware flow control template Y4 Software flow control template 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 &P0 39/61ms at 10pps (North America) &P1 33/67ms at 10pps (Europe) REPEAT COMMAND STRING Type: Configuration Format: AT [cmds] A> [cmds] Description: Causes modem to repeat command string until a keyboard key is pressed REPEAT PREVIOUS COMMAND Type: Immediate Format: A/ Description: Repeats previous command, mainly used for re-dial Note: Do not precede this command with AT, or follow it with . REPORT INFORMATION Type: Immediate Format: AT [cmds] In [cmds] Description: Displays information requested Command Function I0 Reports 4-digit product code I1 Reports DSP code checksum I2 Reports RAM test I3 Reports product type I4 Reports current command settings I5 Reports NVRAM settings I6 Reports link diagnostics I7 Reports product configuration I10 VxD configuration RESULT CODES Type: Configuration Format: AT [cmds] Qn [cmds] Description: Enables modem to send result codes to the DTE Command Function 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 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, 10-155 enabled. X2 Busy tone detection disabled, dial tone detection enabled; result codes 0-6, 10-155 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, 7-155 enabled; also adaptive dialing, and wait for answer enabled. X4 Busy and dial tone detection enabled; result codes 0-155 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, 107, 151, and 155. SOFT RESET Type: Immediate Format: AT [cmds] Zn [cmds] Description: Restores modem profiles previously saved in non-volatile RAM Command Function 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 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 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 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 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 &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 S16=0 Tone dialing test disabled S16=2 Tone dialing test enabled V.21 - ANSWER MODE FALLBACK TIMER Type: Register Format: AT [cmds] S29=n [cmds] Default: 20 Range: Unidentified Unit: .1 second Description: Sets the length of time for V.21 answer mode fallback V.32 HANDSHAKE TIME Type: Register Format: AT [cmds] S28=n [cmds] Default: 8 Range: 0-255 Unit: .1 second Description: Sets length of V.32 handshake Value Meaning 0 V.32 answer tones disabled 255 V.32 at 9600 enabled, all other connections disabled.