ZyXEL Communications COMET 336 User Manual page 24

The Comet 336 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 Comet 336 and
software both have their "echo" feature turned. The Comet 336 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
what is called a "Result Code." The Comet 336 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
There are a few basic commands that do not require the "AT" command prefix. These
are as follows:
Command
A/
<any key>
+++
The Comet 336 supports several groups of AT commands:
AT Command Set/Type
Basic AT (Hayes compatible)
Basic AT$ (on line help)
Extended AT& commands
Extended AT* commands
Fax and Voice AT+ commands
S-Register command
S-Register inquiry command
You may browse the lists of available commands for each command set by using the on-
line help commands: AT$, AT*$, AT&$, and ATS$. Further detail on AT commands
will be covered in the chapters that pertain to their uses.
Description
Select numerical result code
Select verbose result code
Description
Repeats the last issued AT command once
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.
Example
ATB0
AT$
AT&N0
AT*E0
AT+FCLASS=2
ATS0=1
ATS0?
Basic Modem Operation 17