Multi-Tech Systems MT4X56USB manual AT Commands, S-Registers and Result Codes

		Chapter 4 - AT Commands, S-Registers and Result Codes
Command:	Bn	Communication Standard Setting
Values:		n = 0–3, 15, 16
Default:		1 and 16
Description:	B0	Select ITU-T V.22 mode when modem is at 1200 bps.
	B1	Select Bell 212A when modem is at 1200 bps.
	B2	Deselect V.23 reverse channel (same as B3).
	B3	Deselect V.23 reverse channel (same as B2).
	B15	Select V.21 when the modem is at 300 bps.
	B16	Select Bell 103J when the modem is at 300 bps.
Command:	Cn	Carrier Control
Values:		n = 1
Default:		1
Description:	C0	Transmit carrier always off. (Not supported.)
	C1	Normal transmit carrier switching (included for backward compatibility with some software).
Command:	Ds	Dial
Values:		s = dial string (phone number and dial modifiers)
Default:		none
Description:		Dial telephone number s, where s may up to 40 characters long and include the 0–9, *, #, A, B, C,
		and D characters, and the L, P, T, V, W, S, comma (,), semicolon (;), !, @, ^ and $ dial string
		modifiers.

Dial string modifiers:

LRedial last number. (Must be placed immediately after ATD.) P Pulse-dial following numbers in command.

T Tone-dial following numbers in command (default).

V Switch to speakerphone mode and dial the following number. Use ATH command to hang up. W Wait for a new dial tone before continuing to dial. (X2, X4, X5, X6, or X7 must be selected.)

, Pause during dialing for time set in register S8.

; Return to command mode after dialing. (Place at end of dial string.)

! Hook flash. Causes the modem to go on-hook for one-half second, then off-hook again.

@ Wait for quiet answer. Causes modem to wait for a ringback, then 5 seconds of silence, before processing next part of command. If silence is not detected, the modem returns a NO ANSWER code.

^ Disable data calling tone transmission.

$ Detect AT&T call card “bong” tone. The character should follow the phone number and precede the user’s call card number: ATDT1028807637853500$123456789

Command:	DS=y	Dial Stored Telephone Number
Values:		y = 0–3
Default:		none
Description:		Dial a number previously stored in directory number y by the &Zy=x command.
		Example: ATDS=3
Command:	En	Echo Command Mode Characters
Values:		n = 0 or 1
Default:		1
Description:	E0	Do not echo keyboard input to the terminal.
	E1	Do echo keyboard input to the terminal.
Command:	Fn	Echo Online Data Characters
Values:		n = 1
Default:		1
Description:	F0	Enable online data character echo. (Not supported.)
	F1	Disable online data character echo (included for backward compatibility with some software).
Command:	Hn	Hook Control
Values:		n = 0 or 1
Default:		0
Description:	H0	Go on-hook (hang up).
	H1	Go off-hook (make the phone line busy).

MT4X56USB 41