ZyXEL Communications Omni 288S - Manual (Page 90)

Chapter 10 - Voice Mode Operation
10-11
AT Command Syntax
AT is the command line prefix. Voice commands take one of the following forms:
Command-Form Syntax Command-Form Function
+V? Read current setting.
+V=? Read permissible settings.
+V= Set single-value parameter.
+V= Set compound parameter.
Voice AT commands begin with ‘AT’ followed by a ‘+V’ command prefix.
represents the command character/s. The command parameters can are
made up of and/or parameter types. The
type consists of multiple values separated by commas or semicolons.
The first two command-forms are for read actions, the last two are for write
actions. A command line may contain either or both action types or be of the read
or write type only.
Response Syntax
For each command line received, the modem issues a response to each command
in the command line followed by a final response.
Each command response is of the form:
(or) (for ? or =? read commands)
with a final response of:
OK (or) ERROR
The final response is OK if all the commands in the command line have been
successfully executed, otherwise it is ERROR.
Note: characters will not be shown in further examples.
Flow Control
Flow Control is necessary to match the DTE-DCE data rate to the line signaling
rate and to the analog conversion of the voice signals and data. For the Omni
288S, both software XON/XOFF and hardware RTS/CTS flow control are used -
the software flow control is the default setting. The DTE turns off the flow
control, but some other method may be used to avoid overrun of the buffer.