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Basic Modem AT Command Set

Some applications may require a custom modem initialisation string. The AT Command set listed below is for reference only.

Basic AT Commands

  • A/ Re-execute command
  • A Go off-hook and attempt to answer a call
  • B0 Select V.22 connection at 1200 bps
  • B1 Select Bell 212A connection at 1200 bps
  • C1 Return OK message
  • Dn Dial modifier
  • E0 Turn off command echo
  • E1 Turn on command echo
  • F0 Select auto-detect mode (equivalent to N1). (RC144)
  • F1 Select V.21 or Bell 103. (RC144)
  • F2 Reserved. (RC144)
  • F3 Select V.23 line modulation. (RC144)
  • F4 Select V.22 or Bell 212A 1200 bps line speed. (RC144)
  • F5 Select V.22 bis line modulation. (RC144)
  • F6 Select V.32 bis or V.32 4800 line modulation. (RC144)
  • F7 Select V.32 bis 7200 line modulation. (RC144)
  • F8 Select V.32 bis or V.32 9600 line modulation. (RC144)
  • F9 Select V.32 bis 12000 line modulation. (RC144)
  • F10 Select V.32 bis 14400 line modulation. (RC144)
  • H0 Initiate a hang-up sequence
  • H1 If on-hook, go off-hook and enter command mode
  • I0 Report product code
  • I1 Report pre-computed checksum
  • I2 Report OK
  • I3 Report firmware revision, model, and interface type
  • I4 Report response programmed by an OEM
  • I5 Report the country code parameter
  • I6 Report modem data pump model and code revision
  • I7 Reports the DAA code (W-class models only)
  • L0 Set low speaker volume
  • L1 Set low speaker volume
  • L2 Set medium speaker volume
  • L3 Set high speaker volume
  • M0 Turn speaker off
  • M1 Turn speaker on during handshaking and turn speaker off while receiving carrier
  • M2 Turn speaker on during handshaking and while receiving carrier
  • M3 Turn speaker off during dialling/receiving carrier and turn speaker on during answering
  • N0 Turn off automode detection
  • N1 Turn on automode detection
  • O0 Go on-line
  • P Force pulse dialling
  • Q0 Allow result codes to DTE
  • Q1 Inhibit result codes to DTE
  • Sn Select S-Register as default
  • Sn? Return the value of S-Register n
  • =v Set default S-Register to value v
  • ? Return the value of default S-Register
  • T Force DTMF dialling
  • V0 Report short form (terse) result codes
  • V1 Report long form (verbose) result codes
  • W0 Report DTE speed in EC mode
  • W1 Report line speed, EC protocol and DTE speed
  • W2 Report DCE speed in EC mode
  • X0 Report basic call progress result codes
  • X1 Report basic call progress result codes and connections speeds
  • X2 Report basic call progress result codes and connections speeds
  • X3 Report basic call progress result codes and connection rate
  • X4 Report all call progress result codes and connection rate
  • Y0 Disable long space disconnect before on-hook
  • Y1 Enable long space disconnect before on-hook
  • Z0 Restore stored profile 0 after warm reset
  • Z1 Restore stored profile 1 after warm reset
  • &C0 Force RLSD active regardless of the carrier state
  • &C1 Allow RLSD to follow the carrier state
  • &D0 Interpret DTR ON-to-OFF transition per &Qn: 0,5,6 Ignores DTR. 1,2,3,4 Hangs up
  • &D1 Interpret DTR ON-to-OFF transition per &Qn: 0,1,4,5,6 Asynchronous escape. 2,3 Hangs up
  • &D2 Interpret DTR ON-to-OFF transition per &Qn: &Q0 through &Q6 The modem hangs up
  • &D3 Interpret DTR ON-to-OFF transition per &Qn: 0,1,4,5,6 Performs soft reset. 2,3 Hangs up
  • &F0 Restore factory configuration 0
  • &F1 Restore factory configuration 1
  • &G0 Disable guard tone
  • &G1 Disable guard tone
  • &G2 Enable 1800 Hz guard tone
  • &J0 Set S-Register response only for compatibility
  • &J1 Set S-Register response only for compatibility
  • &K0 Disable DTE/DCE flow control
  • &K3 Enable RTS/CTS DTE/DCE flow control
  • &K4 Enable XON/XOFF DTE/DCE flow control
  • &K5 Enable transparent XON/XOFF flow control
  • &K6 Enable both RTS/CTS and XON/XOFF flow control
  • &L0 Select dial up line operation
  • &M0 Select direct asynchronous mode
  • &P0 Set 10 pps pulse dial with 39%/61% make/break
  • &P1 Set 10 pps pulse dial with 33%/67% make/break
  • &P2 Set 20 pps pulse dial with 39%/61% make/break
  • &P3 Set 20 pps pulse dial with 33%/67% make/break
  • &Q0 Select direct asynchronous mode
  • &Q4 Select Hayes AutoSync mode
  • &Q5 Modem negotiates an error corrected link
  • &Q6 Select asynchronous operation in normal mode
  • &R0 CTS tracks RTS (async) or acts per V.25 (sync)
  • &R1 CTS is always active
  • &S0 DSR is always active
  • &S1 DSR acts per V.25
  • &T0 Terminate any test in progress
  • &T1 Initiate local analog loopback
  • &T4 Allow remote digital loopback
  • &T5 Disallow remote digital loopback request
  • &V Display current configurations
  • &W0 Store the active profile in NVRAM profile 0
  • &W1 Store the active profile in NVRAM profile 1
  • &X0 Select internal timing for the transmit clock
  • &X1 Select external timing for the transmit clock
  • &X2 Select slave receive timing for the transmit clock
  • &Y0 Recall stored profile 0 upon power up
  • &Y1 Recall stored profile 1 upon power up
  • &Zn=x Store dial string x (to 34) to location n (0 to 3)
  • %E0 Disable line quality monitor and auto retrain
  • %E1 Enable line quality monitor and auto retrain
  • %E2 Enable line quality monitor and fallback/fall forward
  • \Kn Controls break handling during three states:
    • When modem receives a break from the DTE
      • \K0,2,4 Enter on-line command mode, no break sent to the remote modem
      • \K1 Clear buffers and send break to remote modem
      • \K3 Send break to remote modem immediately
      • \K5 Send break to remote modem in sequence with transmitted data
    • When modem receives \B in online command state:
      • \K0,1 Clear buffers and send break to remote modem
      • \K2,3 Send break to remote modem immediately
      • \K4,5 Send break to remote modem in sequence with transmitted data
    • When modem receives break from the remote modem:
      • \K0,1 Clear data buffers and send break to DTE
      • \K2,3 Send a break immediately to DTE
      • \K4,5 Send a break with received data to the DTE
  • \N0 Select normal speed buffered mode
  • \N1 Select direct mode
  • \N2 Select reliable link mode
  • \N3 Select auto reliable mode
  • \N4 Force LAPM mode
  • \N5 Force MNP mode
  • \V0 Connect messages are controlled by the command settings X, W, and S95
  • \V1 Connect messages are displayed in the single line format
  • +H0 Disable RPI
  • +H1 Enable RPI and set DTE speed to 19200 bps
  • +H2 Enable RPI and set DTE speed to 38400 bps
  • +H3 Enable RPI and set DTE speed to 57600 bps
  • +H11 Enable RPI+ mode
  • -SDR=0 Disable Distinctive Ring
  • -SDR=1 Enable Distinctive Ring Type 1
  • -SDR=2 Enable Distinctive Ring Type 2
  • -SDR=3 Enable Distinctive Ring Type 1 and 2
  • -SDR=4 Enable Distinctive Ring Type 3
  • -SDR=5 Enable Distinctive Ring Type 1 and 3
  • -SDR=6 Enable Distinctive Ring Type 2 and 3
  • -SDR=7 Enable Distinctive Ring Type 1, 2, and 3
  • -SSE=0 Disable DSVD
  • -SSE=1 Enable DSVD

* Serial interface operation only

ECC Commands

  • %C0 Disable data compression
  • %C1 Enable MNP 5 data compression
  • %C2 Enable V.42 bis data compression
  • %C3 Enable both V.42 bis and MNP 5 compression
  • \A0 Set maximum block size in MNP to 64
  • \A1 Set maximum block size in MNP to 128
  • \A2 Set maximum block size in MNP to 192
  • \A3 Set maximum block size in MNP to 256
  • \Bn Send break of n x 100 ms

MNP 10 Commands

  • -K0 Disable MNP 10 extended services
  • -K1 Enable MNP 10 extended services
  • -K2 Enable MNP 10 extended services detection only
  • -SEC=0 Disable MNP10-EC
  • -SEC=1,[] Enable MNP10-EC and set transmit level 0 to 30 (0dBm to -30dBm)

W-Class Commands

  • *B Display list of permanently blacklisted numbers
  • *D Display list of delayed numbers

Caller ID Commands

  • #CID=0 Disable Caller ID
  • #CID=1 Enable Caller ID with formatted presentation
  • #CID=2 Enable Caller ID with unformatted presentation

Fax Class 1 Commands

  • +FCLASS=n Service class
  • +FAE=n Data/fax auto answer

Fax Class 2 Commands

  • +FCLASS=n Service class
  • +FAA=n Adaptive answer
  • +FCLASS= Service class
  • +FCR= Capability to receive
  • +FDCC= DCE capabilities parameters
  • +FDIS= Current sessions parameters
  • +FPTS= Page transfer status
  • +FREV? Identify revision

Voice/Audio Commands

  • #MDL? Identify model
  • #MFR? Identify manufacturer
  • #REV? Identify revision level