Specifications

31
Chapter 4 - AT Commands, S-Registers and Result Codes
Command: B n Answer Tone (ZDXI modems only)
Values: n = 0 or 1
Default: 0
Description: B0 Select ITU-T V.21. V.22, and V.23 answer tones.
B1 Select Bell answer tones, including Bell 103.
Command: &BS n Maximum Reliable Block Size
Values: n = 0 or 1
Default: 1
Description: &BS0 Maximum transmit block size of 64 characters.
&BS1 Maximum transmit block size of 256 characters.
Command: $BA n Baud Adjust
Values: n = 0 or 1
Default: 0
Description: $BA0 Set baud adjust off, speed conversion on. (Serial
port speed is independent of modem data rate.)
$BA1 Set baud adjust on, speed conversion off. (Serial
port speed is same as modem data rate.)
Command: &C n Carrier Detect Control
Values: n = 0, 1, 2, or 4
Default: 1
Description: &C0 Force Carrier Detect high.
&C1 Let Carrier Detect follow carrier signal.
&C2 Let Carrier Detect drop on disconnect, then go
high again (for some CBX phone systems).
&C4 Reset modem when Carrier Detect drops.
Command: D s Dial
Values: s = dial string (phone number and dial modifiers)
Default: none
Description: Dial telephone number s , where s may include up
to 60 digits and T, P, R, comma, colon, and
semicolon characters.