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.

There are a few basic commands that do not require the “AT” command prefix. These are as follows.

Command

Description

A/

Repeats the last issued AT command once.

A>

Repeats the last issued AT command once, or

 

re-dials the last dialed number up to 9 times

 

until a key is pressed or a connection is made.

<any key>

Terminates the current connection attempt, if

 

pressed while modem is handshaking.

+++Escape code sequence. Entered while the modem is in Data Mode. Returns modem to Command Mode.

Your modem supports several groups of AT commands:

AT Command Set/Type

Example

Basic AT (Hayes compatible)

ATB0

Basic AT$ (on line help)

AT$

Extended AT& commands

AT&N0

Extended AT* commands

AT*I1

Fax AT+ commands

AT+FCLASS=2

20 Basic Modem Operation

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ZyXEL Communications U-336R/RE manual Command Description, AT Command Set/Type Example