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Chapter 4 – AT Commands, S-Registers, and Result Codes
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 16
AT Commands
AT CommandsAT Commands
AT Commands
The commands labeled as default are factory default settings.
Command Options Function & Description
+++AT Escape Sequence puts the modem in command mode (and optionally
issues a command) while remaining online. Type +++AT and up to ten
command characters, then press ENTER. Used mostly to issue the
hang-up command: +++ATH <cr>
%%%AT Remote Configuration Escape Sequence initiates remote configuration
mode while online with a remote modem. The remote configuration
escape character (%) is defined in register S13.
A/ Re-execute the last command string.
<any key> Terminate the current connection attempt when entered in handshaking
state.
All the following commands require an AT prefix
$ Calling Card “Bong” Detection.
A Go off-hook and attempt to establish a connection without waiting for a
ring.
Bn Line modulation options.
B0 Select ITU-T V.22 mode for 1200 bps connection and V.21 mode for 300
bps.
B1 (default) Select Bell 212A for 1200 bps connection; Bell 103 for 300 bps.
B2 Select V.23 1200 bps for receiving, 75 bps for transmitting in originate
mode; 75 bps for receiving and 1200 bps for transmitting in answer
mode.
B3 Select V.23 75 bps for receiving, 1200 bps for transmitting in originate
mode; 1200 bps for receiving and 75 bps for transmitting in answer
mode.
Dn Dial command, beginning the dialing sequence. The string “n” (telephone
number and modifiers) listed as follows is entered after the “D”
command.
P Pulse dial. Only digits 0 to 9 can be dialed.
R Reverse dial. Originate call in answer mode (go on-line in answer mode).
Sn Dial the phone number stored in NVRAM at location n (n=0, 1, 2, 3).
T DTMF tone dial. Any digit 0 to 9, *, #, A, B, C… maybe dialed as a tone.
W Wait for second dial tone. The modem waits for the second dial tone
before processing the dial string.
, Pause. Causes the modem to pause for a time before processing the dial
string (value set by S8 register).
! Flash hook (for call transfer). Causes the modem to go on-hook for 0.5
second then return off-hook.
@ Wait for 5 seconds of silence after dialing a number.