Quick Tips When Issuing At Commands - ZyXEL Communications U-336R/RE User Manual

Start the terminal program by double-clicking the Test Connection
icon. When the terminal window appears, enter the dial command
with ZyXEL's BBS as the phone number.
Type:
The modem will go off-hook, dial the number, and after a few
seconds of negotiation tones you should be connected to our BBS.
You will receive a login message asking for your name. For the
purposes of this example you need not continue. Just click the
"disconnect" icon on the toolbar.

Quick Tips when issuing AT Commands

ATDT17146930762<enter> (Omit the '1714' if
you are in this area code)
The ENTER or RETURN key must be pressed to execute a
command.
Multiple AT commands can be combined into one line. For
example, AT&D2 and AT&N0 can be combined into one line
AT&D2&N0.
Your modem processes commands from left to right. The AT
command that appears to the right might over-write the
command to the left if they are trying to accomplish tasks or set
modes that cannot coexist.
If you see duplicated characters for each one you type, your
modem and software both have their "echo" feature turned on.
The modem command echo state is switched Off using ATE0
and On using ATE1 (default). To eliminate the double
characters, turn off the software's command echo rather than
using the ATE0 command. If you see no characters in your
Basic Modem Operation 19