20 AT Command Set Summaries
Command
Options
Function & Description
&Yn
Break handling. Destructive Break clears the buffer. Expedited Break is
sent immediately to the remote system.
&Y0
Destructive, expedited.
&Y1 *
Nondestructive, expedited.
&Y2
Nondestructive, unexpedited.
&Z?
Display all the phone numbers stored in non-volatile RAM.
&Zn=s
n=0-3
Write phone number/s to NVRAM at location n (n=0-3) use AT*Dn to set
the default dial pointer.
Extended AT* Command Set
Command
Options Function & Description
*Dn
n=0-3
Set default dial pointer at telephone directory location n.
*En
Modem error control negotiation.
*E0 *
if error control negotiation fails, keep the non-error control connection.
*E1
If error control negotiation fails, disconnect the call (hang-up).
*Qn
Action taken when line quality changes.
*Q0
No action to poor signal quality.
*Q1
Retrain action taken if signal quality is poor.
*Q2 *
Adaptive rate, automatic fall-back or forward.
*Q3
Disconnect if signal quality is poor.
