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Appendix D - AT Command Summary
Command Values Description
Un n = 0, 1, 2, or 3 U0 places modem in Analog Loop Originate Mode.
U1 places modem in Analog Loop Answer Mode.
U2 places modem in Remote Digital Loopback test
mode.
U3 places modem in Local Digital Loopback test
mode.
$VDn n= 0 or 1 * $VD0 disables Voice/Data Dialing
$VD1 enables Voice/Data Dialing
Vn n = 0 or 1 V0 means Result Codes sent as digits (terse
response).
* V1 means Result Codes sent as words (verbose
response).
W Wait for new dial-tone.
&Wn n = 0 or 1 &W0 causes modem to store its current parameters
in non-volatile RAM, and modem will load these for
future sessions instead of reading factory ROM
defaults, unless &F command used.
* &W1 causes modem to not store parameters.
Xn n = 0,1,2,3 or 4 * X0 selects Basic Result Codes (w/o CONNECT
1200, CONNECT 2400).
X1 selects Extended Result Codes (w/CONNECT
1200, CONNECT 2400).
X2 selects Standard AT Command set with NO
DIAL TONE.
X3 selects Standard AT Command set with BUSY.
X4 selects Standard AT Command set with NO
DIAL TONE and BUSY.
#Xn n= 0 or 1 * #X0 selects single XOFF character sent until XON
level returns.
#X1 selects multiple XOFF characters after buffer
level is full.
Yn n = 0 or 1 * Y0 disables sending or responding to long space
“break”.
Y1 enables sending or responding to long space
“breaks”.
Z All configuration parameters are reset to default
values.
, In Dial Command Causes pause during dialing.
; In Dial Command Causes return to Command Mode after dialing.
! In Dial Command Causes modem to flash On-Hook.
@ In Dial Command Causes modem to wait for ringback, then 5 seconds
of silence before processing next part of command.
* Factory Default Setting