Black Box MD403A Enter Key, Answer, Repeat Last Command, Communication Standard Setting

CHAPTER 4: AT Commands, S-Registers, and Result Codes

You can issue several commands in one line, in what is called a command string. The command string begins with AT and ends when you press ENTER. Spaces to separate the commands are optional; they are ignored by the command interpreter. The most familiar command string is the initialization string, which is used to configure the modem when it is turned on or reset, or when your communications software calls another modem.

AT COMMAND SUMMARY
Command:	AT	Attention Code
Values:	n/a
Description:		The attention code precedes all command lines
		except A/, A:, and escape sequences.
Command:	ENTER Key
Values:	n/a
Description:		Press the Enter (Return) key to execute most
		commands.
Command:	A	Answer
Values:	n/a
Description:		Answer call before final ring.
Command:	A/	Repeat Last Command
Values:	n/a
Description:		Repeat the last command string. Do not precede
		this command with AT. Do not press Enter to
		execute.
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.

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