Multi-Tech Systems MT5634ZLX 2 manual AT Commands, S-Registers, and Result Codes Basic AT Commands

Chapter 3 - AT Commands, S-Registers, and Result Codes

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

WWait 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

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