ZyXEL Communications COMET 336, Руководство пользователя

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18 Basic Modem Operation
Modem Result Codes
When you execute or try to execute an AT command, your modem sends a result code to
let you know whether the command was executed. An OK result code means the AT
command you sent was executed. If you receive an ERROR code, it means the command
was invalid.
The Comet 336 also provides result codes that show:
•
Whether or not a Dial Tone was detected when the modem originated a call.
•
If a busy signal was detected when the modem originated a call.
•
If a remote telephone ring was detected when dialing.
•
The speed, protocol, and error control/data compression method used.
•
If your modem has detected an incoming ring.
Result codes can originate from any of eight result code sets. The ATXn command lets
you choose which set of result codes your modem uses. By default, your modem uses
result codes equivalent to the ATX5 command.
Viewing S Register Values
Status registers (or "S-registers") contain values that determine the modem’s operating
characteristics. Whenever you send an AT command to your modem, you are actually
changing the value of an S-register.
You can use the Sr? command to view the value of S-register ‘r’. For example, to view
the value of S-register S0, which controls auto-answering, type ATS0? and press Enter.
The modem responds with a three-digit character showing the value of this register,
followed by OK. A value of 002, for example, means your modem will auto-answer
incoming calls after the second ring.
Changing S Register Values
You can use the ATS0=n command to change the value of an S-register.
For example, to have your modem auto-answer an incoming call after two rings, set S-
register 0 to 2. Be sure the n value is between 1 and 255. If n is set to 0, your modem
will not answer incoming calls.
Non-Volatile Memory
The Comet 336 has an amount of memory set aside for storing user information such as
frequently used phone numbers and default command settings. This latter is particularly
useful when you use your modem to call a variety of different locations that require
different settings. For this reason, the Comet 336 provides a number of user “Profiles”