ZyXEL U-336RE User Guide - Page 31

Quick Tips when issuing AT Commands

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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 ATV0 ATV1 Description Select numerical result code. Select verbose result code. Basic Modem Operation 17

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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.