Table B-1 AT Command Set Summary Command Function (Example) Description -------- ------------------ --------------------------------- A Answer incoming Answers an incoming call. circuit-switched digital modem call (AT A) &C Serial port CD &C0 forces CD to remain on at all control times. (AT &C2) &C1 forces CD to follow the state of carrier from the remote system. CD turns on after CONNECT message is sent to host (default). &C2 forces CD to remain on except temporarily after disconnect. D (ATD5551234) Dials an outgoing 56/64 Kbps circuit-switched digital connection. DT (ATDT5551234) Dials an outgoing analog modem call, using the optional V.32bis modem, at a maximum modem line speed of 14.4 Kbps using touch-tone dialing. DP (ATDP5551234) Dials an outgoing analog modem call, using the optional V.32bis modem, at a maximum modem line speed of 14.4 Kbps using pulse dialing. &D DTR control (AT &D0 causes digital modem to &D0) ignore DTR from host. &D1 causes digital modem to enter command state on detecting on-off transition of DTR. &D2 causes digital modem to hang up current calls upon on-off transition of DTR and prepares serial port to accept AT command at any speed (default) . E AT command echo E0 disables the echo of AT (AT E0) commands back to the host computer. E1 enables the echo of AT commands to the host computer (default). &F Restore factory Restores all factory default defaults settings. (AT &F) H Hang up (AT H) Hangs up the current connections. I Identification (AT 10 displays the product and 10) options ID. 11 displays the flash memory checksum. 14 displays the modem product code, precomputed checksum, firmware revision number, model, interface type, country code, and data pump model. O Enter connect Causes the digital modem to go state (AT 0) out of command mode into on-line mode. Q Result code Q0 enables the output of result control (AT Q) codes (default). Q1 disables the output of result codes. Q2 disables the output of result codes in answer mode only. \Q Serial port flow \Q0 disables flow control. control (AT \Q) \Q1 enables bi-directional XON/XOFF software flow control. \Q3 enables bi-directional RTS/CTS hardware flow control (default). %R Read all S Provides an output list of all S registers registers. SN? Read configuration Reads a specific S register register (AT S60?) setting. SN= Write Writes to a specific S register. configuration register (AT S60=64) \S Read on-line Reads the status of any status: command parameters that have been settings (AT \S) modified through AT commands. \T Link inactivity \T0 disables inactivity timer timer (AT \Tl ) (default). \Tn link inactivity timer in minutes. The digital modem automatically disconnects the call if no activity is sensed within n (n = 0-255) minutes. V Result code format V0 enables short form result (AT V0) codes. Vl enables long form result codes (default). &W Stores Stores the configuration of all S configuration (AT registers that are not part of &W) the digital modem initial configuration set. Z Reset (AT Z) Disconnects all calls in progress and performs a complete digital modem system reset. +++ Enter command Causes digital modem to enter the state command state if it is currently in the on-line state. $B Set baud rate (AT 0-Autobaud (default). Other $B57600) settings are 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200. %V Show version Displays digital modem firmware number (AT %V) version. Table B-2 AT Command Set Summary for the Internal Analog Modem Command Function (Example) Description -------- ------------------ --------------------------------- B Set 1200 bps Initiates calls using either (operation= 0) ITU-T V.220 or]Bell 212a at 1200 bps. 0-V.22 1-Bell 212a (default) C1 ATC1 Modem responds with OK F Select modem 0-Auto detect (default) modulation mode 1-V.21/Bell 103 3-V.23 4-V.22/Bell 212a 5-V.22bis 6-V.32bisN.32 4800 bps 7-V.32bisN.32 7200 bps 8-V.32bisN.32 9600 bps 9-V.32bis 12000 bps 10-V.32bis 14400 bps L Modem speaker 0,1-Low volume control 2-Medium (default) 3-High M Modem speaker 0-Off operation 1-On during handshaking, off while receiving carrier (default) 2-On during handshaking, on while receiving carrier 3-Off while receiving carrier, on during answering X Select the subset O-Basic call progress of result messages that will be used 1-Basic call progress and by the modem to connection inform the PC of rate the results of commands 2-Basic call progress and connection rate 3-Basic call progress and connection rate 4-All call progress and connection rate %E Line quality O-Disable monitor control 1-Enable and retrain 2-Enable and fallback/forward 3-Enable and auto-retrain but hang up immediately if line quality becomes insufficient %L Return received Returns a value that indicates line signal level the received line signal level %Q Report line signal Reports the line signal quality quality &6 Generate guard O-Disable (default) tone 1-Select 1800 Hz guard tone &V Display current configuration \A Set MNP max block 0-64 1-128 2-192 3-256 size \B Transmit break to Sends break to remote modem with remote a length in multiples of 100 ms (n x 100 ms) in non-error corrected mode only. n = 1-9 \G End-to-end, O-Disable (default) modem-to-modem flow control 1-Enable \L MNP mode O-Stream (default) 1-Block \N Set preferred O-Normal speed buffered error-correcting mode to be 1-Direct negotiated in a subsequent data 2-Reliable link connection 3-Auto reliable 4-Force LAPM 5-Force MNP -K MNP extended Enables/disables conversion of a services V.42 LAPM connection to an MNP 10 connection. O-Disable 1-Enable 2-Enable; inhibits MNP extended services initiation during V.42 LAPM answer mode detection phase -Q MNP 10 fallback to Enables or disables fallback from 2400 bps MNP 10 to V.22bisN.22. (V.22bis)/1200 (V.22) O-Disable 1-Enable (default) *H Link negotiation Controls the connection speed for speed link negotiations before upshift occurs between two MNP Class 10 modems. O-Highest rate (default) 1-1200 bps 2-4800 bps +F All fax commands All fax commands (AT+fax sub command) Table B-3 Remote S Registers Registers Description --------- ---------------------------------- SO Auto Answer O-Disabled (default) 1-Enabled S50 ISDN Switch Signaling Type: 1-AT&T SESS Custom 3-Nl-1/AT&T5ESS (default) 6-Nl-1/NTI DMS 100 or Siemens EWSD S51 Phone #1 S52 Phone #1 Service Profile ID (SPID) S53 Phone #2 (if required by your carrier) S54 Phone #2 Service Profile ID (SPID) (if required by your carrier) S55 Terminal Endpoint Identifier 1: Stores the first TEI assigned by the switch if a second directory number is required by your carrier. A value of 255 indicates no TEI has been assigned. This field is read-only. S56 Terminal Endpoint Identifier 2: Stores the second TEI assigned by the switch. A value of 255 indicates no TEI has been assigned. This field is read-only. S57 Terminal Initialization State: Indicates the status of the first TEI using SPID 1. This field is read-only. 0-3ComImpact digital modem has not attempted initialization 1-3ComImpact digital modem has initialized successfully using SPID 1 2-3ComImpact digital modem has failed initialization using SPID 1 S58 Terminal Initialization State: Indicates the status of the second TEI using SPID 2. This information is provided only if your carrier requires a second directory number. This field is read-only. 0-3ComImpact digital modem has not attempted initialization 1-3ComImpact digital modem has initialized successfully using SPID 2 2-3ComImpact digital modem has failed initialization using SPID 2 S59 U Interface Status: This field is read-only. 0-U interface is not synchronized with the switch 1-U interface is synchronized and ready 560 B Channel Data Rate: 56-56 Kbps (default) 64-64 Kbps S61 Outgoing Call Type: 0-Follow dial modifiers (default) 2-ISDN 3-Internal analog fax modem 563 (only for models Incoming Voice Call Routing (bit map) with an internal fax modem) Bit Position/Feature: 0-Phone #1 internal analog fax modem 1-Phone #1 Phone Out port 2-Phone #2 internal analog fax modem 3-Phone #2 Phone Out port 565 Voice Automatic Number Identification: Displays the phone number of an incoming voice call. This field is read-only. 566 Data Automatic Number Identification: Displays the phone number of an incoming data call. This field is read-only. S70 Dynamic Bandwidth Allocation: O-DBA disabled 1-DBA enabled (default) S71 B Channel Protocol: 1-Async-Sync PPP conversion 2-V.120 S73 V.120 Frame Type: O-I frame (default) 1-Ul frame S74 V.120 Maximum Frame Size (range 240-256): 256-Maximum frame size of 256 is used (default) 248-Maximum frame size of 248 is used (for AdTran compatibility, use 253) S80 Multilink PPP: O-Disable 1-Enable (default) S81 Multilink PPP Directory Number: If the destination to which you are dialing a Multilink PPP call requires two separate directory numbers, you must include the second telephone number of up to 15 digits in this S register. If left blank, then the number used to dial the first link is used. S82 Multilink PPP Endpoint Identifier Class: If required, this information is provided by your Internet service provider. 1-Locally Assigned Address 2-Internet Protocol (IP) Address 3-IEEE 802.1 Globally Assigned MAC Address 4-PPP Magic-Number Block S-Public Switched Network Directory Number S83 Multilink PPP Endpoint Identifier (up to 20 characters) If required, this information is provided by your Internet service provider. Table B-4 3ComImpact Digital Modem Result Codes Short Form Long Form Meaning ------------- ------------- ------------------------------- 0 OK Indicates that the most recent command or action was successfully completed. 0 OK Indicates that the most recent command or action was successfully completed. 2 RING Indicates that an incoming call is present and no AT Answer command is outstanding. 3 NO CARRIER Indicates that the most recent call attempts did not establish a call or that the physical ISDN interface is not operational. 4 ERROR Indicates that the most recent command or action was not successfully completed. 7 BUSY Indicates that the most recent call attempt did not connect because the remote destination was busy. 5 CONNECT 1200 Indicates 1200 bps analog modem connection. 10 CONNECT 2400 Indicates 2400 bps analog modem connection. 11 CONNECT 4800 Indicates 4800 bps analog modem connection. 12 CONNECT 9600 Indicates 9600 bps analog modem connection. 15 CONNECT 14400 Indicates 14400 bps analog modem connection. 28 CONNECT 28800 Indicates 28800 bps analog modem connection. 56 CONNECT 56000 Indicates 56000 bps digital modem connection. 64 CONNECT 64000 Indicates 64000 bps digital modem connection.
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