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Chapter 3 - AT Commands, S-Registers, and Result Codes
MT5634ZLX/E
Basic AT Commands
Command Function (* indicates factory default setting)
A/ Re-execute the last command string.
<any key> Terminate the current connection attempt when entered in handshaking state.
The following commands require an “AT” prefix.
A Go off-hook and attempt to establish a connection without waiting for a ring
Bn Line modulation options
B0 Select V.22 mode for 1200 bps connection
B1 * Select Bell 212A for 1200 bps connection
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
B15 Select V.21 for 300 bps connection
B16 Select Bell 103 for 300 bps connection
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
R Reverse dial. Originate call in answer mode (go on-line in answer mode)
S=n Dial the phone number stored in NVRAM at location “n” (n=0, 1, 2, 3)
T DTMF tone dial
W Wait for second dial tone. The modem waits for the second dial tone before
processing the dial string Pause. Cause the modem to pause for a time before
processing the next character in the dial string (specified by S8 register)
! Hook Flash (for call transfer). Cause the modem to go on-hook for 0.5 second then
return to off-hook
@ Wait for 5 seconds of silence after dialing number
; Return to command state after dialing a number without disconnecting the call
En AT command echo options
E0 Echo disabled
E1 * Echo enabled
Hn Switch-hook control
H0 * Modem goes on-hook
H1 Modem goes off-hook
Mn Speaker control
M0 Speaker always off
M1 * Speaker on until carrier present
M2 Speaker always on