Specifications

Chapter 2 - AT Commands, S-Registers and Result Codes
13
COMMAND: $A n
VALUES: n = 0 or 1
DEFAULT: $A0
DESCRIPTION: $A0 discards data during auto-reliable time
period.
$A1 buffers data during auto-reliable time
period.
COMMAND: #A n
VALUES: n = 0 thru 3
DEFAULT: #A0
DESCRIPTION: #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.
VALUES: $
DEFAULT: n/a
DESCRIPTION: This symbol ( $ ) placed in dialing string
enables the modem to detect AT&T's "call
card" tones to access user's calling card
when originating an on-line connection
COMMAND: &B n
VALUES: n = 0 or 1
DEFAULT: &B0
DESCRIPTION: &B0 selects normal transmit buffer size.
&B1 selects reduced transmit buffer size.