ZyXEL Omni TA 128 User Guide - Page 124
AT Command Set, Reference
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16 AT Command Set Reference Operation Modes of the DTE Interface There are two operation modes for the DTE interface: • Simplex mode - used for conventional AT Command operation. • Multiplex mode - used as an internal interface for ZyXEL CAPI drivers. Simplex mode In simplex mode, the TA128 is used just like an ordinary TA. The DTE interface will be either in the command state or in the data state. At most, only one data connection session is possible at any time. A number of different AT Commands can be used to invoke various functions. The simplex mode is designed for AT Command users. The guides and descriptions throughout the rest of this manual, if not otherwise specified, are applicable to this mode. The power-on default of the DTE interface is in simplex mode as well. Multiplex mode The multiplex mode is designed for ZyXEL CAPI drivers. It can also be used by third parties to develop various drivers on different platforms for public domain or for commercial purposes. The commands or data are packetized. Each packet has its own destination address. All the DTE channels can be accessed individually by way of multiplexing. 112