Zyxel-communications U-336SA Manual do Utilizador descarregar pdf (Página 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.

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