Motorola SM56 manual Tone Dial, Result-Code Format, Select Call-Progress Result Codes to Return

Table 1: AT and AT& Commands

Command	Option	Description
T	T	Tone Dial
		This command instructs the modem to use DTMF tone
		dialing.
		Example: ATDT5554678.
		This command uses DTMF tone Dialing to dial the number
		5554678
V		Result-Code Format
		Determines whether the modem sends short- or ling-form
		messages to the communications application, indicating
		the connection status, rate, and mode.
	V0	Return Numeric Code (Short Form)
	V1	Return Text (Long Form)
X		Select Call-Progress Result Codes to Return
	X0	No Carrier; Connect. Modem reports lack of a carrier sig-
		nal; connection success/failure; modem dials without wait-
		ing for a dial tone
	X1	No Carrier; Connect; Connect <rate>. Modem reports lack
		of a carrier signal; connection success/failure, and the
		computer data rate established
	X2	No Carrier; Connect; Connect <rate>; No Dial Tone.
		Modem reports lack of a carrier signal; connection success/
		failure; the computer data rate established; and the lack of
		a dial tone
	X3	No Carrier; Connect; Connect <rate>; Busy-tone. Modem
		reports lack of a carrier signal; connection success/failure;
		the computer data rate established; and the presence of a
		busy signal
	X4	No Carrier; Connect; Connect <rate>; No Dial-tone; Busy-
		tone. Modem reports lack of a carrier signal; connection
		success/failure; the computer data rate established; the lack
		of a dial tone; and the presence of a busy signal
Z	Z	Reset Modem Parameters to Default Configuration
&C		DCD Control
	&C0	Always Asserted
	&C1	Asserted in Data Mode Only
&D		DTR Control
		Determines how modem responds to DTR signal from
		DTE.
	&D0	Ignore DTR
	&D1	Enter Command mode when DTR transitions from
		asserted to de-asserted

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