Black Box MD1640A, MD1641A manual Appendix C Command Summary, Description, $An, #An

		APPENDIX C: Command Summary
Appendix C - Command Summary
Command	Values	Description
AT		Attention Code that precedes most comd.
		strings except A/, A: and Escape Codes.
RETURN		Pressing RETURN key executes most
		commands.
$	In Dial Comd.	This symbol placed in dialing string enables
		the modem to detect AT&T's "call card"
		tones for accessing user's calling card to
		originate an on-line connection.
A		Answer call, even if no ring present. Repeat
		last command. (Do not precede this
		command with AT. Do not hit RETURN to
		execute.)
A:		Continuous redial of last number until
		answered.
A/		Repeat previous command. (Do not
		precede this command with AT.)
$An	n = 0 or 1	*$A0 discards data during auto-reliable time
		period.
		$A1 buffers data during auto-reliable time
		period.
#An	n = 0 thru 3	*#A0 selects initial handshake at 33,600 to
		31,200 to 28,800 to 24000 to 21,600 to
		19,200 to 16,800 to 14,400 to 12,000 to 9600
		to 4800 to 2400 to 1200 to 300 bps.
		#A1 selects initial handshake at 33,600 bps
		only.
		#A2 selects initial handshake at 33,600 to
		31,200 to 28,800 to 24000 to 21600 to
		19,200 to 16,800 19,200 to 14,400 to 9600
		to 4800 bps.
		#A3 selects initial handshake at 2400 to
		1200 to 300 bps.
* Factory Default Setting			151