ZyXEL Communications U-336SA - Manual (Page 31)

Basic Modem Operation 17
Quick Tips when issuing AT Commands
•
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 terminal window when
you type, the modem’s echo setting is probably set to off. In this
case, issue the ATE1 command.
•
When a command is successfully issued and accepted, a modem
responds with a “Result Code.” Your modem supports both
“verbose” result codes (i.e. “OK”), and “numerical” result codes
(i.e. “0”). You can use the ATV command to set it one way or the
other as follows.
Command Description
ATV0 Select numerical result code.
ATV1 Select verbose result code.