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Chapter 3 – AT Commands, S-Registers, and Results Codes
Multi-Tech Systems, Inc. MT2834ZDX User's Guide 9
Command: $BAn 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: &Cn 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: &CDn Cleardown at Disconnect
Values: n = 0, 1
Default: 0
Description: &CD0 Execute a cleardown at disconnect.
&CD1 Do not execute a cleardown at disconnect.
Command: Ds 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.
Command: DsNd Store Telephone Number
Values: s = dial string (phone number and dial modifiers)
d = 0 or 1
Default: none
Description: To store, enter D followed by dial string s, then N followed by directory number d.
Example: ATDT9,5551212N1.
Command: &Dn Data Terminal Ready Control
Values: n = 0–3
Default: 2
Description: &D0 Modem ignores DTR signal.
&D1 When DTR drops, the modem hangs up. While DTR is low, the modem accepts commands
but will not dial or auto-answer until DTR goes high again.
&D2 Same as &D1.
&D3 When DTR drops, the modem hangs up and resets as if an ATZ command were issued.
Command: $Dn DTR Dialing
Values: n = 0 or 1
Default: 0
Description: $D0 Do not dial when DTR goes high.
$D1 Dial stored number N0 when DTR goes high.
Command: %DCn AT Command Control
Values: n = 0 or 1
Default: 0
Description: %DC0 The modem responds to AT commands.
%DC1 The modem ignores AT commands.
Note: The modem will respond to AT%DC for 10 seconds after power-up.
Command: %DFn Format Line Probe Data
Values: n = 0 or 1
Default: 0
Description: %DF0 Display data in graph format. Y axis is gain shown in dBm.
%DF1 Display data in table format. Gain is shown numerically in dBm at 75Hz increments from
150Hz to 3750Hz.