Abstract: Method for two-way digital communication between Data Terminal Equipment (DTE) and Data Communication Equipment (DCE), includes a novel command set. The inventive method involves initiating communication by transmitting one command from a set of DTE commands to the command interpreter block. That block interprets the command, and acts on the command, directing the command to the appropriate control block. The control block receiving the decoded command then executes the command by sending a signal representative of the command to a hardware interface device which transmits the signal to the receiving DCE.

Abstract: Communication system and method including a calling apparatus and a called apparatus. The system comprises handshake means for exchanging negotiation information including error correction ECM capabilities data, contained in a plurality of command frames between the calling apparatus and the called apparatus. The system further includes means for initiating an error correction operation, a transmitter for transmitting and receiving between the calling and the called apparatus a data set having associated data frame identification information, and verification means for verifying receipt of the data set. A method corresponding to the system also is described.

Abstract: A facsimile machine is provided which can transmit and receive data over asynchronous digital data networks in accordance with an asynchronous protocol. The facsimile machine can provide and receive negotiation information during a data transmission process.

Abstract: A facsimile machine is provided which includes a mechanism to detect from the received message the operation mode of a transmitting facsimile. The mechanism automatically sets and re-sets the facsimile machine in an operation mode corresponding to the operation mode detected.