Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set Contents Page Introduction .................................................................. 1 AT Commands Reference ........................................... 2 AT Commands For Testing and Debugging .............. 16 AT Commands Reference S-Registers...................... 17 AT Command Set Result Codes................................ 22 AT FAX Command Set............................................... 24 AT FAX Commands Reference ...
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference AT commands are issued to the modem to control the modem's operation and software configuration. AT commands can only be entered while the modem is in command mode. The format for entering AT commands is: TYPE: ATXn where X is the AT command, and n is the specific value for that command. PRESS: Enter Any command issued is acknowledged with a response in either text or numeric values known as result codes.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT Commands Reference (continued) Cn Carrier Control The modem will accept the C1 command without error in order to assure backward compatibility with communications software that issues the C1 command. However, this modem does not support the C0 command. The C0 command may instruct some other modems to not send carrier (i.e., it puts them in a receive-only mode). C0: C1: Transmit carrier always off. Normal transmit carrier switching.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference (continued) Fn Online Data Character Echo Command This command determines if the modem will echo data from the DTE. This modem does not support the F0 version of the command. However, the modem will accept F1, which may be issued by older communication software, to assure backward compatibility. F0: F1: Online data character echo enabled (NOT SUPPORTED, ERROR). Online character echo disabled.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT Commands Reference (continued) Mn Monitor Speaker Mode This command turns the speaker on or off. M0: M1: M2: M3: The speaker is off. The speaker is on until the modem detects the carrier signal (default). The speaker is always on when modem is off-hook. The speaker is on until the carrier is detected, except while dialing.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference (continued) T Select Tone Dialing This command instructs the modem to send DTMF tones while dialing. Dialed digits are tone dialed until a P command or dial modifier is received. This is the default setting. Vn DCE Response Format This command controls whether result codes (including call progress and negotiation progress messages) are displayed as words or their numeric equivalents.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT Commands Reference (continued) Extended Result Codes Disabled: Enabled: Displays only the basic result codes OK, CONNECT, RING, NO CARRIER, and ERROR. Displays basic result codes, along with the connect message and the modem's date rate, and an indication of the modem's error correction and data compression operation. Dial Tone Detect Disabled: Enabled: The modem dials a call regardless of whether it detects a dial tone.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference (continued) &Cn Data Carrier Detect (DCD) Control Data Carrier Detect is a signal from the modem to your computer indicating that the carrier signal is being received from a remote modem. DCD normally turns off when the modem no longer detects the carrier signal. &C0: &C1: The state of the carrier from the remote modem is ignored. DCD circuit is always on.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT Commands Reference (continued) &Gn V.22bis Guard Tone Control This command determines which guard tone, if any, to transmit while transmitting in the high band (answer mode). This command is only used in V.22 and V.22bis mode. This option is not used in North America and is for international use only. &G0: &G1: &G2: Guard tone disabled (default). Sets guard tone to 550 Hz. Sets guard tone to 1800 Hz.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference (continued) &Pn Pulse Dial Make-to-Break Ratio Selection This command is effective only for Japan. &P0: &P1: 34/66 make/break ratio (10 pps) (default). 34/66 make/break ration (20 pps). Result Codes: OK n = 0, 1 ERROR Otherwise &Qn Asynchronous Communications Mode Asynchronous Mode, buffered. Same as \N0. Reserved. Reserved. Reserved. Reserved. Error Control Mode, buffered (default).
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT Commands Reference (continued) &Tn Self-Test Commands This command allows the user to perform diagnostic tests on the modem. These tests can help to isolate problems when experiencing periodic data loss or random errors. &T0 &T1 Abort. Stops any test in progress. Local analog loop. This test verifies modem operation, as well as the connection between the modem and computer.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference (continued) “,“ Pause Time 2 sec Press any key to continue; ESC to quit. Option No Carrier Disc DTMF Dial Speed Escape GuardTime Data Calling Tone Line Rate DSVD mode Press any key to continue; ESC to quit.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT Commands Reference (continued) \G Modem Port Flow Control \G0: \G1: Returns an “OK” for compatibility (default). NOT SUPPORTED responds ERROR. Result Codes: OK n=0 ERROR Otherwise \J Adjust Bits/s Rate COntrol When this feature is enabled, the modem emulates the behavior of modems that force the DTE interface to the line speed. \J0: \J1: Turn off feature (default). Turn on feature.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference (continued) \Nn Error Control Mode Selection This command determines the type of error control used by the modem when sending or receiving data. \N0: \N1: \N2: \N3: \N4: \N5: \N7: Buffer mode. No error control (same as &Q6). Direct mode. MNP or disconnect mode. The modem attempts to connect using MNP 24 error control procedures. If this fails, the modem disconnects. This is also known as MNP reliable mode. V.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT Commands Reference (continued) -Cn Data Calling Tone Data Calling Tone is a tone of certain frequency and cadence as specified in V.25 which allows remote Data/FAX/Voice discrimination. The frequency is 1300 Hz with a cadence of .5 s on and 2 s off. -CO: -C1: Disabled (default). Enabled. Result Codes: -SSE OK n = 0, 1 ERROR Otherwise DSVD command This command enables or disables DSVD (Digital Simultaneous Voice and Data).
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands For Testing and Debugging The following commands are to be used for testing and debugging only and are not meant for general use. &&C Write to/Read from DSP Register AT&&C, writes the value to DSP register at location . AT&&C reads from location . &&L Line-to-Line Loopback This command provides a loopback for line-to-line.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference S-Registers S-registers generally affect how the AT commands perform. Contents of the registers can be displayed or modified when the modem is in command mode. To display the value of an S-register: TYPE: PRESS: ATSn? where n is the register number. Enter To modify the value of an S-register: TYPE: ATSn = r where n is the register number, and r is the new register value.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference S-Registers (continued) S4 Response Formatting Character (user defined) This register determines the ASCII value used as the line feed character. The modem uses a line feed character in command mode when it responds to the computer.
Advanced Data Addendum December 4, 1996 AT&T MTC Data/FAX AT Command Set AT Commands Reference S-Registers (continued) S8 Comma Dial Modifier Time This register sets the time, in seconds, that the modem must pause when it encounters a comma (,) in the dial command string. S10 Range: 0—65 Default: 2 Units: seconds Automatic Disconnect Delay This register sets the length of time, in tenths of a second, that the modem waits before hanging up after a loss of carrier.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference S-Registers (continued) S30 Inactivity Timer S30 specifies the length of time (in minutes) that the modem will wait before disconnecting when no data is sent or received. This function is only applicable to buffer mode. S32 Range: 0—255 Default: 0 Units: minutes Synthetic Ring Volume This register specifies a synthetic ring volume in dB with an implied minus sign.
Advanced Data Addendum December 4, 1996 AT&T MTC Data/FAX AT Command Set AT Commands Reference S-Registers (continued) S37 Dial Line Rate (default 0) S37 = 0 S37 = 1 S37 = 2 S37 = 3 S37 =4 S37 = 5 S37 = 6 S37 =7 S37 = 8 S37 = 9 S37 = 10 S37 = 11 S37 = 12 S37 = 13 S37 = 14 S37 = 15 S37 = 16 S37 = 17 S37 = 18 S37 = 19 S42 maximum modem speed reserved 1200/75 bits/s 300 bits/s reserved 1200 bits/s 2400 bits/s 4800 bits/s 7200 bits/s 9600 bits/s 12000 bits/s 14400 bits/s 16800 bits/s 19200 bits/s 21600 bit
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT Commands Reference S-Registers (continued) S48 LAPM Error Control and Feature Negotiation (default 7) S48 = 7 Negotiation enabled. S 48 = 128 Negotiation disabled; forces immediate fallback options specified in S36. The following chart lists the S36 and S48 configuration settings necessary to negotiate certain types of connections.
Advanced Data Addendum December 4, 1996 AT&T MTC Data/FAX AT Command Set AT Command Set Result Codes Table 2 shows the Result Codes. Table 2.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT FAX Command Set Class 1 FAX Commands The Lucent Technologies HSM Data/FAX Complete Chip Set supports FAX commands conforming to EIA standard 578. These commands are given here with short descriptions; complete explanations are given in the standard, available from the Electronic Industry Association.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT FAX Commands Reference +FCLASS? Service Class Indication This command causes the modem to display the current setting. The modem can operate either as a Class 0 data modem or a class 1 FAX modem. Typical responses: +FCLASS? +FCLASS=? 000 if in data mode; 001 if in FAX class 1, 008 if in voice mode, and 080 if in VoiceView† mode. Service Class Capabilities This command causes the modem to display the classes it supports.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT FAX Commands Reference (continued) +FTM= Transmit FAX Data with Carrier This command causes the modem to transmit data at the modulation specified by . The following table shows the values you can enter for this command and the meaning of those values. Command Option +FRM= Modulation Speed (bits/s) +FTM=3 V.21 Channel 2 300 +FTM=24 V.27ter 2400 +FTM=48 V.27ter 4800 +FTM=72 V.29 7200 +FTM=96 V.
Advanced Data Addendum December 4, 1996 MTC Data/FAX AT Command Set AT FAX Commands Reference (continued) +FTH= Transmit HDLC Data with Carrier This command causes the modem to transmit data framed in the HDLC protocol at the modulation specified by . Command Option +FRH= Modulation Speed (bits/s) +FTH=3 V.21 Channel 2 300 +FTH=24 V.27ter 2400 +FTH=48 V.27ter 4800 +FTH=72 V.29 7200 +FTH=96 V.29 9600 +FTH=73 V.17 7200 +FTH=74 V.17 (short train) 7200 +FTH=97 V.
MTC Data/FAX AT Command Set Advanced Data Addendum December 4, 1996 AT FAX Commands Reference (continued) Manufacturer Identification (+FMI?) Read Syntax: AT+FMI? This parameter reports the manufacturer identification. Typically, the text shall consist of the name of the manufacturer, but the manufacturer may choose to provide more information (e.g., address, telephone number for customer service, etc.). The maximum text length is 80 characters. It is preferred that the first eight characters be unique.