Motorola 326X V.34, and V.32bis, V.34-SDC manual Longspace, Select Options

Table A-1.

AT Commands, Cross-Referenced to Front Panel Options (Continued)

AT	Parameter &
Command	Option	Description
ATX2	=2	The modem waits for dial tone and uses only NO CARRIER, CONNECT, CONNECT <Rate>
		and NO DIALTONE result codes.
ATX3	=3	The modem detects busy signal and uses NO CARRIER, CONNECT, CONNECT <Rate>, and
		BUSY result codes.
ATX4	=4	The modem waits for dial tone and detects busy signal. Only NO CARRIER, CONNECT,
		CONNECT <Rate>, BUSY, and NO DIAL TONE result codes are used.
	Longspace	Longspace Disconnect
ATY0	=Off	The modem does not disconnect when it receives space longer than 1.6 seconds. When
		terminating a call, the modem does not send continuous space for 4 seconds.
ATY1	=On	The modem disconnects when it receives space longer than 1.6 seconds. When terminating a
		call, the modem sends continuous space for 4 seconds.
	Select Options	Selecting an Option Set
		The new option set takes effect immediately.
ATZ0/ATZ1	=1	The modem uses Option Set 1.
ATZ2	=2	The modem uses Option Set 2.
ATZ3	=3	The modem uses Option Set 3.
ATZ4	=4	The modem uses Option Set 4. NOTE: The modem disconnects from the line when ATZ is
		entered. Any test in progress is terminated. Since any AT command that follows ATZ is
		ignored by the modem, ensure that ATZ is the last command entered in a command string. Use
		the AT&Y command to select the option set in which the modem powers up.
	DCD	DCD Control
		Determines how the modem sets DCD signals. The modem signals the DTE with DCD on
		EIA/TIA 232-D Pin 8 (V.24 Circuit 109).
AT&C0	=High	DCD is always on.
AT&C1	=Normal	DCD is off during dialing and while the modem is training with the remote modem. DCD is on
		in data mode. It is off when the modem is disconnected from the telephone line.
AT&C2	=ACU On	DCD is on when the modem is disconnected so that terminals requiring this signal can use the
		ACU. During dialing, DCD goes off until both modems train and are ready to pass data. DCD
		is on in data mode. DCD drops on a disconnect momentarily.
AT&C3	=Remote	This setting applies to simulated half-duplex applications and works only if the remote modem
		also supports RTS/DCD signaling. When the remote DTE turns RTS on, DCD is forced on at
		the local modem. The local modem can receive data only during this period. Once the remote
		DTE drops RTS, DCD at the local modem follows. The Rem RTS/DCD option lets you choose
		the type of RTS/DCD signaling.
AT&C4	=Wink	DCD is always on; however, it drops after disconnect and remains low momentarily.
	DTR	DTR Control
		This command determines how the modem interprets the DTR signal. The local DTE uses
		DTR (Pin 20) to signal the modem.
AT&D0	=High	The modem ignores DTR from the DTE. The modem reads DTR as always high. Choose this
		option for DTR/CTS flow control with error correction, or if the DTE does not provide DTR
		signal.
AT&D1	=Escape	When ACU Select=AT and AT Form=Async (AT&M), the modem enters the AT Escape mode
		(+++) when DTR goes off while the modem is in data or test mode.

Gray shading indicates country-specific options. See Appendix C for your country’s options.

Configuration

Quick-Reference

Configuration Quick Reference A-9